ACOUSTIC EMISSION MONITORING AND STRAIN ANALYSIS OF COMPOSITE MATERIALS EMBEDDED WITH DELAMINATION UNDER COMPRESSION LOAD

Abstract

Abstract: For the study of the damage evolution and failure process of composite specimens embedded with circular delamination, for which the diameters were 5mm and 10mm, respectively, the uniaxial compression test, acoustic emission (AE) monitoring and strain measurement of unidirectional glass fiber/epoxy composites were conducted. The results show that the delamination growth and the failure mechanism of two kinds of specimens with different delamination were similar under compressive loading. The area of delamination has great influence on the bearing capacity of specimens. The larger area of delamination, the lower carrying capacity and the more serious damage of the specimen are obtained. The load-longitudinal strain curve changes from linear to approximate linear to nonlinear. The change process was coincided with the analysis results of AE signals.

Key words: composite material, delamination, compression failure, acoustic emission, strain analysis

CLC Number:

TB332

LV Zhi-hui, LIU Ran, WANG Ya-rui, ZHOU Wei. ACOUSTIC EMISSION MONITORING AND STRAIN ANALYSIS OF COMPOSITE MATERIALS EMBEDDED WITH DELAMINATION UNDER COMPRESSION LOAD[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(9): 24-28.

References

[1] Galappaththi U I K, De Silva A K M, Macdonald M, et al. Review of inspection and quality control techniques for composite wind turbine blades. Insight, 2012, 54(2): 82-85.
[2] Mahmood M S, Roham R. Simulation of fatigue failure in a full composite wind turbine blade. Composite Structures, 2006, 74(3): 332-342.
[3] Thomas M H, Dharmaraj M, James E L. Post buckling analysis of a wind turbine blade substructure. Journal of Solar Energy Engineering, 2005, 127(4): 544-552.
[4] Al-Qabandi O, De Silva A, Al-Enezi S, et al. Synthesis, fabrication and mechanical characterization of reinforced epoxy and polypropylene composites for wind turbine blades. Journal of Reinforced Plastics and Composites, 2014, 33(24): 2287-2299.
[5] Tay T E. Characterization and analysis of delamination fracture in composite: An overview of developments from 1990 to 2001. Applied Mechanics Reviews, 2003, 56 (1): 1-32.
[6] 李亚娟, 周伟, 刘然, 等. 风电叶片复合材料层间开裂声发射监测. 河北大学学报: 自然科学版, 2014, 34(2): 219-224.
[7] 周伟, 孙诗茹, 冯艳娜, 等. 风电叶片复合材料拉伸损伤破坏声发射行为. 复合材料学报, 2013, 30(2): 240-246.
[8] 周伟, 张洪波, 马力辉, 等. 风电叶片复合材料结构缺陷无损检测研究进展. 塑料科技, 2010, 38(2): 84-86.
[9] 周伟, 张晓霞, 韦子辉, 等. 风电叶片复合材料压缩损伤破坏声发射监测. 工程塑料应用, 2011, 39(11): 61-64.
[10] Fotouhi M, Najafabadi M A. Investigation of the mixed-mode delamination in polymer-matrix composites using acoustic emission technique. Journal of Reinforced Plastics and Composites, 2014, 33(19): 1767-1782.
[11] Niezrecki C, Avitabile P, Chen J, et al. Inspection and monitoring of wind turbine blade-embedded wave defects during fatigue testing. Structural Health Monitoring, 2014, 13(6): 629-643.
[12] Senthil K, Arockiarajan A, Palaninathan R, et al. Investigations on adhesively bonded curved CFRP panels with closed debonds subjected to compressive load. Thin-Walled Structures, 2014, 85: 367-376.
[13] Yao X F, Bijlaard F S K, Kolstein M H, et al. Tensile strength and fracture behaviors of complex GFRP composites with a central hole. Journal of Composite materials, 2005, 39(14): 1247-1260.
[14] Cao M S, Zhou W, Qu G M, et al. Dynamic response and fracture mechanism of a novel structural radar absorbing material. Chinese Physics Letters, 2008, 25(8): 2954-2956.
[15] 王瑜, 赵美英, 余明. 复合材料层压板分层损伤扩展与压缩强度预测. 机械科学与技术, 2011, 30(7): 1051-1055.
[16] 周伟, 张晓霞, 韩婧, 等. 复合材料单搭接胶接头破坏声发射监测. 工程塑料应用, 2014, 42(3): 69-72.
[17] 李亚娟, 周伟, 刘然, 等. 复合材料 Ⅱ 型分层损伤演化声发射监测. 玻璃钢/复合材料, 2015, 1: 012.