COMPOSITES SCIENCE AND ENGINEERING

Process performance optimization and failure mechanism of FRP/steel embedded T-joint

XIA Yi, ZHANG Er, MENG Tianzhen, CHEN Guotao

2024, 0(10): 5-10. DOI: 10.19936/j.cnki.2096-8000.20241028.001

Asbtract ( 120 )

PDF (8204KB) ( 138 )

References | Related Articles | Metrics

Based on the embedded T-joint scheme of FRP/steel given in Reference [1] , the structural form was optimized and the embedded T-joint scheme was proposed. In the preparation process, three types of joints were put forward: Without U-shaped groove (type Ⅰ), with U-shaped groove (type Ⅱ) and with U-shaped groove and plain fabric suture ( type Ⅲ ) at the sealing core of the steel groove. And the embedded T-type connection joint was made for the above three process schemes. The tensile and compressive bending bearing characteristics of the three joints were tested, and the initial damage characteristics, damage evolution and failure mechanism of the three joints were compared and analyzed. The results show that: The embedded T-shaped connection scheme effectively reduces the stress concentration level of the end faces on both sides of the steel channel and the laminated plate under the compression bending load, and the sealing rubber can play a good sealing effect and stress buffer role; the initial damage load of type Ⅲ joint is the highest under both tensile and compressive bending loads, and the connection reliability of type Ⅲ joint is higher under the ultimate load state.

Laser ablation behavior of quartz fiber reinforced epoxy resin matrix composites

CHEN Song, ZHEN Yueze, MA Zhuang, GAO Lihong, WANG Donghong

2024, 0(10): 11-16. DOI: 10.19936/j.cnki.2096-8000.20241028.002

Asbtract ( 111 )

PDF (9723KB) ( 122 )

References | Related Articles | Metrics

Quartz fiber reinforced epoxy resin matrix composites were prepared using epoxy resin as the matrix and quartz fiber as the reinforcement. The study investigated the irradiation effect of high-energy continuous laser with different power densities on quartz fiber reinforced epoxy resin matrix composites. The study analyzed the effects of laser with power densities of 100 W/cm², 500 W/cm², and 1 000 W/cm² on the macroscopic and microscopic morphology and the mass ablation rate of irradiated samples. Through the temperature evolution data and resin pyrolysis threshold model, the ablation behavior was further analyzed. Results indicates that after laser irradiation on the surface of composites, the deposited energy causes epoxy resin matrix pyrolysis. As the laser power density increases, the degree of epoxy resin matrix pyrolysis increases, the ablation region on the surface of the composites continues to expand, and the mass ablation rate increases, the damage to the composites intensifies. The generation of gas and residual carbon through epoxy resin matrix pyrolysis play a role in energy consumption, shielding lasers and blocking heat. The composites have a certain resistance to laser ablation.

Damage moniotoring for composite structures by using laser-induced graphene and electrical tomography

YU Xinfei, YAN Gang, ZHOU Deng

2024, 0(10): 17-23. DOI: 10.19936/j.cnki.2096-8000.20241028.003

Asbtract ( 69 )

PDF (12121KB) ( 69 )

References | Related Articles | Metrics

Targeting the high velocity impact of missiles, shells and their fragments on military aircrafts, composite laminate with self-sensing capability for monitoring ballistic damage is proposed. Graphene sensing layer on the surface of polyimide paper is fabricated by laser-induced technology and co-cured in composite laminate to sense and identify damage with electrical tomography. Before and after the composite laminate is subjected to high velocity impact, excitation current is injected into the graphene sensing layer and the corresponding boundary voltage is measured. The distribution image of the conductivity change of the sensing layer caused by the damage is reconstructed by regularization-based algorithm, and information about the damage is identified. Experimental studies by ballistic impacts have shown that laser-induced graphene layer on polyimide paper has good sensing capability, and the tomography image reconstructed by electrical tomography can accurately reflect the location of damage and provide information about the approximate size of the damage, verifying the effectiveness of the proposed self-sensing composite laminate for monitoring of high velocity impact damage.

Research on tensile failure mechanism of single lap bonded joint of CFRP laminates

CHEN Yuliang, ZHANG Jun, WU Hewei, YANG Liu, LI Jianting

2024, 0(10): 24-31. DOI: 10.19936/j.cnki.2096-8000.20241028.004

Asbtract ( 144 )

PDF (8540KB) ( 123 )

References | Related Articles | Metrics

Single lap bonded joint is a common composite material connection method, which has the advantages of high strength and excellent durability. It is widely used in engineering practice, but the failure and damage of single lap bonded joint are often encountered. In order to further study the failure mechanism of the bonded joint, single lap bonded joint samples with different lap lengths were prepared, and the load-displacement curves of the joint were obtained by tensile tests with tensioning machines and other equipment. Based on the continuous damage mechanics model and 3D Hashin failure criterion, a Cohesive unit is selected to simulate the cohesive layer damage, and the damage initiation and evolution of the bonded joint during the whole tensile phase of CFRP laminates is simulated by finite element software. The validity of the simulation results is verified by experimental data. The results show that the failure process of the joint goes from the crack formation of the adhesive layer to the damage initiation of the CFRP layer and then to the cohesive failure of the adhesive layer. Under the action of tensile load, the damage area of the joint first occurs at the end of the joint, and then gradually spreads inward. The joint is mainly subjected to shear stress and peel stress under type Ⅱ fracture mode, and shear stress is the main cause of damage initiation.

Study on tensile properties and deterioration mechanism of PE-ECC under coupling attack of freeze-thaw cycle and sulfate-chloride

ZHENG Yi, CHEN Zhongshu, ZHANG Jin, ZHANG Yaoting

2024, 0(10): 32-39. DOI: 10.19936/j.cnki.2096-8000.20241028.005

Asbtract ( 80 )

PDF (15187KB) ( 54 )

References | Related Articles | Metrics

In order to study the tensile properties of polyethylene fiber engineered cementitious composites(PE-ECC) under coupling attack of freeze-thaw cycle and sulfate-chloride, two kinds of environments, pure water and sulfate-chloridesolution (5% Na₂SO₄+3.5% NaCl), were set up, and the axial tensile tests were carried out after 0, 50, 100, 150, and 200 freeze-thaw cycles, respectively. The test results showed that the damage degree of the specimens in both environments increased with the freeze-thaw cycles, but the degree of surface spalling was more serious and the deformation performance was lower in the sulfate-chloride environment under the same freeze-thaw cycles, but the ultimate strains could all achieve above 2%. On this basis, the micro-mechanism of deterioration of PE-ECC tensile property was investigated by XRD, SEM, EDS energy spectrum analysis, NMR and other techniques. The results show that swelling hydration products such as brucite, gypsum and ettringite produced by sulfate-chloride erosion cause pores and micro-cracks to develop, which work together with the freezing of water in the pores, aggravates the damage of the internal structure.

Preparation and properties of rare earth doped silicon-based aerogels and composites

YANG Bin, SUN Liangyou, YANG Lifen, GAO Qingfu, LI Muyi

2024, 0(10): 40-44. DOI: 10.19936/j.cnki.2096-8000.20241028.006

Asbtract ( 97 )

PDF (4371KB) ( 41 )

References | Related Articles | Metrics

In order to obtain aerogel insulation materials with resistance to γ radiation, a rare earth-based aerogel composite material was developed in this paper obtained by hydrolysis and polycondensation. Silica sol, gadolinium nitrate and lanthanum nitrate were used to obtain a rare earth-based aerogel composite material with glass fiber. The results show that rare earth-based aerogels have typical characteristics of nanoporous materials. After heat treatment at 900 ℃, both the shrinkage rate and the specific surface area of gadolinium-based aerogels are much smaller than that of SiO₂ aerogels, besides, there is no difference of the mechanical properties of gadolinium-based aerogel composite materials after irradiation treatment, which indicates that the materials has both radiation resistance and thermal insulation properties, providing an important guarantee for the safe and efficient operation of nuclear reactors.

Mechanical properties of carbon fiber reinforced aluminum phosphate composites

WANG Xiaobing, QIN Yan, FU Huadong, HE Shan, WANG Shuai, YANG Shaojie

2024, 0(10): 45-52. DOI: 10.19936/j.cnki.2096-8000.20241028.007

Asbtract ( 92 )

PDF (11371KB) ( 60 )

References | Related Articles | Metrics

In order to improve the mechanical properties of the inorganic composites in service environment, the carbon fiber reinforced aluminum phosphate composites were prepared by filling ultra-fine kaolin and B₄C particles with self-made aluminum dihydrogen phosphate as matrix and carbon fiber as the reinforcement. The composites was characterized by mechanical universal testing machine, differential scanning calorimetry(DSC), X-ray diffraction(XRD), and scanning electron microscopy(SEM). The results showed that with the addition of two kinds of aggregate particles, the maximum density of carbon fiber reinforced aluminum phosphate composite reaches 1.871 g/cm³, and the bending strength increases first and then decreases at room temperature. Kaolin particles crack to form Al₂O₃ and SiO₂ at high temperature, and form a certain amount of SiC and molten substances composed of BPO₄ and B₂O₃ with B₄C, filling the pores generated by matrix cracking and reducing the structural defects of composite materials. When m[Al(H₂PO₄)₃]∶m(kaolin)∶m(B₄C) is 100∶35∶15, the maximum average bending strength is up to 129.5 MPa, and the bending strength is 65.47 MPa after 60 min heat treatment at 600 ℃. The mechanical strength retention rate reaching 50.56%, the mechanical strength retention rate was improved.

Research on the thermal vibration characteristics of SMA laying configuration on patch repair laminates

CUI Kaixin, LU Xiang, XIE Haohang, LIU Xinglong

2024, 0(10): 53-64. DOI: 10.19936/j.cnki.2096-8000.20241028.008

Asbtract ( 59 )

PDF (14237KB) ( 45 )

References | Related Articles | Metrics

Fiber reinforced materials made of shape memory alloys embedded in composite materials have the advantages of high strength and self-repair, which can significantly improve the rigidity and peel resistance of the repair structure. Based on the first-order shear deformation theory (FSDT) and Hamilton’s principle, the constitutive equation and vibration control equation of SMA composites are derived. The single-sided repair laminate model of SMA patch embedded with multiple laying configurations was established by ABAQUS software, and the influence of SMA laying configuration on the vibration characteristics of repair glass fiber laminate at different temperatures was explored through numerical simulation and experimental verification. The results show that compared with the single-line type (D) and vertical cross type (C), the first three mode shapes of the diagonal cross type (X) SMA repair plate are closer to the traditional repair plate (Q₀), and the overall stiffness and peel resistance of the repair structure are the best. The natural frequency drop rate of the repair board of the four configurations under the action of high temperature has the following relationship: Q₀>D₆>C₆>X₆, that is, the SMA embedded with different laying methods can reduce the influence of temperature on the natural frequency to varying degrees, of which the X₆-type has the lowest drop rate, up to 1.24%. The number of SMA laying has the following relationship with IQR value and natural frequency decline rate: 6>12>24, with the increase of the number of SMA embedded in the board, the influence of thermal effect on the natural frequency decreases, and the thermal stability and repair effect of X₂₄ repair structure are the best. The high-order natural frequencies of SMA repair boards are more sensitive to temperature and more susceptible to temperature changes in their natural frequencies.

Effect of layup parameters on the aeroelasticity of large span ratio composite wing

WANG Kangjie, WANG Junli, CAO Peng, LIU Zhiyuan, ZHANG Sheng

2024, 0(10): 65-71. DOI: 10.19936/j.cnki.2096-8000.20241028.009

Asbtract ( 74 )

PDF (4577KB) ( 47 )

References | Related Articles | Metrics

The dipole grid method is used to calculate the non-constant aerodynamic forces and the P-K method is used to calculate the flutter velocity to investigate the flutter characteristics of composite airfoils with large aspect ratios, focusing on the effects of non-equilibrium coefficient layups, equal-thickness multiangular layups, and same-angle variable-thickness layups on the flutter velocity and the hypersonic cratering phenomenon. It is shown that the ±45° layer angle can increase the flutter speed and reduce the cratering area compared with the 0° layer angle to obtain a larger flight Mach number and dynamic stability; in the low subsonic speed, the flutter speed of the equalized layer is higher than that of the unbalanced layer, and the change of the flutter speed on the unbalanced coefficient is not significant. In high-subsonic speed, the balanced layer can enhance the flutter velocity at the lowest point and reduce the depth of the crater, while the unbalanced layer can lag the flutter velocity at the lowest point; the increase of the layer thickness can enhance the flutter velocity with a linear relationship, but the intrinsic frequency decreases with the increase of the layer thickness.

Axial compression capacity evaluation of concrete columns reinforced with glass fiber reinforced polymer bars

RAN Li, WU Wen, ZHOU Lei

2024, 0(10): 72-78. DOI: 10.19936/j.cnki.2096-8000.20241028.010

Asbtract ( 67 )

PDF (7201KB) ( 57 )

References | Related Articles | Metrics

The influence of glass fiber reinforced polymer (GFRP) bars on the axial compression capacity of concrete columns is crucial. To thoroughly evaluate the performance of GFRP bars in strengthening concrete columns, prediction models for the load-bearing capacity were established using the Random Forest (RF), Artificial Neural Network (ANN), AdaBoost, and XGBoost algorithms. A database containing experimental data from 256 GFRP-reinforced concrete columns was created. The existing theoretical formulas for the axial compression capacity of GFRP-reinforced concrete columns were preliminarily evaluated, and the predictive accuracy of the RF, ANN, AdaBoost, and XGBoost models for the axial compression capacity of GFRP-reinforced concrete columns was further analyzed. The results showed that the determination coefficient of the existing theoretical formulas for the axial compression capacity of GFRP-reinforced concrete columns (around 0.70) was lower than that of the RF model (0.82), AdaBoost model (0.80), and XGBoost model (0.80). Moreover, the average absolute error and root mean square error were generally higher for the existing theoretical formulas compared to the RF, ANN, AdaBoost, and XGBoost models, indicating that the accuracy of the existing theoretical formulas was inferior to that of the RF, ANN, AdaBoost, and XGBoost models. In comparison to the ANN model, the RF, AdaBoost, and XGBoost models could accurately evaluate the actual axial compression capacity performance of GFRP-reinforced concrete columns, especially the RF model. This research provides a reference for the axial compression capacity design and analysis when designing GFRP bars for strengthening concrete structures.

Influence of critical fastener missing on composite wing root stringer joint structure

LI Xing, NIE Lei, GUO Jin, LEI Anmin, GAO Jingjing

2024, 0(10): 79-86. DOI: 10.19936/j.cnki.2096-8000.20241028.011

Asbtract ( 57 )

PDF (15007KB) ( 32 )

References | Related Articles | Metrics

With the increasing application of composite materials in civil aircraft main bearing structures, study of the failure mode and load transfer rule in critical joint structures such like wing-fuselage joint is being more and more important. However, the research on the main bearing joint structures containing damage is still insufficient. As a potential critical failure mode, the study of fastener missing is of great significance to further understand the mechanical performance of composite wing root joint structure and ensure the safety of civil aircraft structure. Taking the stringer joint structure in composite wing root of civil aircraft as the research object, the intact specimen and specimen with critical fastener missing were designed and manufactured respectively. The influence of critical fastener missing on specimen stiffness, strain distribution and bolt load distribution was studied by means of test and simulation. The results show that after the critical fastener (located at the 1^st row) missing, the joint stiffness of wing root is not significantly changed. The values of strain gages located at the 1^st row change within 5%, and the values of strain gages located at the 2^nd ~4^th rows near the missing fastener increase significantly, with the maximum of 22.1%, 13.4%, 9.1% respectively. The loads of bolts located at the 1^st ~3^rd rows near the missing fastener increase significantly, with the maximum of 15%, 18%, 12% respectively, and the loads of bolts in other locates increase between 5%~10%. The missing of critical fastener has little effect on the load distribution of horizontal T-type fitting and butt plate.

Study on water absorption and interfacial properties of CFRP and GFRP composites in hygrothermal environment

ZHANG Ousheng, LI Chenggao, NIU Yanzhao, TIAN Jingwei, XIAN Guijun, GUO Rui

2024, 0(10): 87-96. DOI: 10.19936/j.cnki.2096-8000.20241028.012

Asbtract ( 118 )

PDF (10087KB) ( 90 )

References | Related Articles | Metrics

The mechanical properties of fiber reinforced resin composites (FRP) deteriorate under hygrothermal environment, which will affect its service performance and life. In this paper, the water absorption and diffusion behavior of pultruded carbon fiber and glass fiber reinforced composite (CFRP and GFRP) rods in distilled water at 40 ℃, 60 ℃ and 80 ℃, as well as the short beam shear strength degradation rule of rods were studied, the life prediction model of short beam shear strength was established based on time-temperature equivalent principle. The results show that the GFRP rod has lower water diffussion rate and saturation water absorption rate. Water molecules and immersion temperature are the key factors affecting the deterioration of short beam shear strength. Under low immersion temperature, the short beam shear strength rapidly degrades with the ingression of water molecules. High temperature exposure at 80 ℃ accelerated the debonding of glass fiber-resin interface, resulting in the degradation rate of short beam shear strength of GFRP rod is much higher than that of CFRP rod. The long-term life prediction results show that the stable short beam shear strength retention rate of CFRP rod is 77.4%, while the short beam shear strength of GFRP rod is completely lost under long-term immersion.

Exploration of the process and method for damage failure analysis of civil aircraft composite components

ZHANG Guishu, SHEN Bingfeng, TANG Yunyang, YUE Haiyan, ZHONG Li

2024, 0(10): 97-102. DOI: 10.19936/j.cnki.2096-8000.20241028.013

Asbtract ( 75 )

PDF (12335KB) ( 52 )

References | Related Articles | Metrics

With the massive application of composite parts and components in the batch production and service phase of civil aircraft, the problem of composite damage failure has gradually emerged. In order to standardize the work of failure analysis of composite component damage, based on the experience of carrying out failure analysis of composite component damage, the process and method of failure analysis of composite component damage in civil aircraft have been established. Combined with the case of damage failure of the outer hatch of the landing gear of the flight line, the reverse inversion of the hatch damage failure process is carried out to find out the cause of the damage failure, and to provide a solution to the problem or optimization for the design, manufacture, and maintenance of the composite parts and components, which provides an analytical procedure and a methodology that is easy to be guided and implemented.

Optimal design of thread-taking-up mechanism and study on suture tension of composite prefabricated double-sided suture device

WU Chengyuan, DONG Jiuzhi, JIANG Xiuming

2024, 0(10): 103-109. DOI: 10.19936/j.cnki.2096-8000.20241028.014

Asbtract ( 58 )

PDF (8734KB) ( 44 )

References | Related Articles | Metrics

In order to solve the problem of excessive tension of carbon fiber suture in the thread path, the thread tension of double-sided suture device was analyzed. Catenary model, thread and tension adjuster, thread taking-up hole and thread ring tension model were established based on the thread path of double-sided suture device. The tension variation during suture was analyzed, and the structure size was optimized by constrained random direction method for the thread taking-up mechanism, and the suture experiment was carried out for the optimized two-sided suture device. The experimental results show that the tension of the overpass suture of the double-sided carbon fabric suture device is reduced by 58% under the optimized taking-up mechanism, which solves the problem of more hair caused by excessive tension in the overpass suture, improves the quality of the stitches, and provides a basis for ensuring the stability of the tension of the stitches.

Preparation of recycled carbon fiber/polypropylene fiber felt and study on the properties of molded composite

LI Nan, LIU Ruohua, YANG Yang, GAO Jinglei, YANG Yuqiu

2024, 0(10): 110-119. DOI: 10.19936/j.cnki.2096-8000.20241028.015

Asbtract ( 94 )

PDF (11196KB) ( 48 )

References | Related Articles | Metrics

Using recycled carbon fiber (RCF) and polypropylene (PP) as raw materials, RCF/PP felt is prepared through non-woven process, and then prepared into RCF/PP composite materials through hot pressing molding to investigate the non-woven process parameters and mold pressing parameters as well as the material performance. The results demonstrate that: The needling process adopts a needling density of 15 pin/cm² and a needling depth of 10 mm; the hot bonding process uses a pressure of 130~180 N/cm² and a temperature of 160~180 ℃. The composite material consolidated by acupuncture is hot pressed and formed at 190 ℃ and 6 MPa; the composite material that is thermally bonded and consolidated is formed by hot pressing at 177~180 ℃ and 7 MPa. The tensile properties of the CD direction of needle-punched felt are 77.8% higher than those of the PD direction, while thermal bonded felt are 59.3% higher than those of the PD direction. RCF/PP composite materials exhibit a certain degree of anisotropy.

Design and analysis of the single-sided double-needle double-thread sewing head

GAO Ziqiao, DONG Jiuzhi, CHEN Yunjun, JIANG Xiuming

2024, 0(10): 120-124. DOI: 10.19936/j.cnki.2096-8000.20241028.016

Asbtract ( 55 )

PDF (6544KB) ( 36 )

References | Related Articles | Metrics

To achieve single-sided stitching on composite material preforms, improve production efficiency, and ensure consistent product quality, a single-sided double-needle double-thread sewing head is designed based on the single-sided double-needle double-thread stitching process. Firstly, it can achieve variable-angle stitching on one side of the composite material preform, increasing the thickness of the stitched preform and enhancing its shear stress resistance. Secondly, the sewing head adopts a dual-motor drive and incorporates related structural designs such as the swinging stabbing mechanism and synchronous transmission mechanism. The overall design and assembly of the sewing head are carried out in Pro/E, and the strength verification of the suture needle is performed using Workbench software. Finally, assemble the single-sided double-needle double-thread sewing head.

Design and analysis of glass fiber composite battery pack cover

ZHAO Gang, CAO Qinglin, QIU Rui, GUO Ping’an, WANG Juchuang

2024, 0(10): 125-133. DOI: 10.19936/j.cnki.2096-8000.20241028.017

Asbtract ( 106 )

PDF (15645KB) ( 71 )

References | Related Articles | Metrics

In order to reduce the weight of the body, the upper cover of the metal battery pack is designed to reduce the weight of the glass fiber composite. According to the technical requirements of the upper cover, the black flame retardant glass fiber checkered cloth prepreg is used for the ply design, and the [(0,90)/(±45)/(0,90)/(±45)/(0,90)]₂ ply is selected as the optimal performance scheme through the test. FiberSIM software is used to lay the upper cover structure of the battery pack, the laying and cutting scheme of cover parts is discussed, the pavement feasibility analysis of (0,90) and (±45) is carried out respectively, and the ply is analyzed according to the completeness index to determine that the cutting scheme is the best solution. The battery pack cover was statically analyzed under bump, emergency braking and left sharp turn conditions, and the maximum displacement value and maximum stress value of the metal and glass fiber battery pack covers were compared respectively, which verified the accuracy of the glass fiber composite layer laying scheme. The strength, stiffness, air tightness, flame retardancy, thermal conductivity and voltage resistance of the actual manufactured products meet the design requirements, and the weight reduction effect is 41.22%, which meets the requirements of lightweight.

Research progress on fatigue simulation of composite hydrogen cylinder

YU Mingyue, YU Xiaochen, ZHU Yingdan, BAO Guanjun, CHEN Gang

2024, 0(10): 134-139. DOI: 10.19936/j.cnki.2096-8000.20241028.018

Asbtract ( 90 )

PDF (922KB) ( 69 )

References | Related Articles | Metrics

Composite hydrogen cylinders have the advantages of light weight, high specific strength and strong designability, which are widely used for both hydrogen storage and transportation. The charging and discharging of hydrogen may result in fatigue damage of composite hydrogen cylinders, which is one of the main failure modes. Therefore, it has great theoretical and engineering application values to understand the fatigue behavior and develop fatigue life prediction of composite hydrogen cylinders. In this paper, the recent research progress of fatigue simulation analysis and the fatigue failure theories of composite hydrogen cylindersare introduced. The research methods of fatigue life prediction and the influence of main structural parameters of hydrogen storage tanks on fatigue life are summarized. And the future development trend of fatigue simulation is prospected.

Review of high-speed impact test and simulation of sandwich structures

WANG Jiyun, ZHANG Shenglan, ZHENG Dongli, LI Shenghao

2024, 0(10): 140-149. DOI: 10.19936/j.cnki.2096-8000.20241028.019

Asbtract ( 64 )

PDF (4740KB) ( 44 )

References | Related Articles | Metrics

Honeycomb sandwich structure is more and more used in military vehicles and ships as a potential armor structure because of its good protection effect against bullets and various explosives. Generally, honeycomb sandwich structures will be subjected to different forms of high-speed impact such as bullets and explosives in the battlefield environment, and these impacts will cause different forms of damage to honeycomb sandwich structures. Therefore, scholars at home and abroad have conducted a lot of research on the anti-high-speed impact performance and damage mode of honeycomb sandwich structures. This paper reviews and summarizes the domestic and foreign research on two different forms of high speed impact, namely, explosion impact and ballistic impact. In terms of explosion impact, it discusses the air blast test, underwater explosion test, fluid-structure coupling effect and core form difference, and in terms of ballistic impact, it discusses the air gun test, equivalent modeling of honeycomb sandwich structure, damage form of panel and ballistic limit velocity. Finally, this paper discusses the shortcomings and improvement methods in the current high-speed impact test and simulation of honeycomb sandwich structures.

Research status of dynamic response and shock resistance design of typical protective materials under airburst load

LUO Jiayuan, CHEN Zhelun, LI Shiyue, GAO Cong

2024, 0(10): 150-160. DOI: 10.19936/j.cnki.2096-8000.20241028.020

Asbtract ( 122 )

PDF (1805KB) ( 67 )

References | Related Articles | Metrics

With the continuous increase in demand in both military and civilian sectors, equipment protection will face challenges such as explosive impacts, e.g., the impact of airborne explosion waves on aircraft, missiles, and police blast-resistant suits. Under the influence of explosive loads, the interactions between different parts of the structure, as well as the effects of material and geometric nonlinearity, make the dynamic mechanical behavior exceptionally complex. Therefore, the dynamic response and protective performance of structures under explosive loads have become a hot and challenging issue that urgently needs attention. This article provides a detailed review and summary of the current research status in the field of explosive impact. First and foremost, it reviews the empirical formula calculations, numerical simulations, and experimental research on the propagation characteristics of explosive loads. Furthermore, it elaborates on the dynamic response of typical protective design materials such as porous materials, ceramics, fiber-reinforced composites,and homogeneous metals under the effect of explosive loads, as well as the progress in the design research of impact-resistant structures. The research content involves structural damage and destruction effects, blast energy absorption characteristics, and protective design. Finally, the article concludes and provides prospects for this research field, highlighting several key research challenges that need to be analyzed and addressed urgently. It aims to provide references and guidance for the subsequent design of blast-resistant structures.

Table of Content