Analysis of structural strength and progressive damage of countersunk bolt lap joint with CFRP

doi:10.19936/j.cnki.2096-8000.20211128.002

Abstract

Abstract: Carbon fiber reinforced polymer (CFRP) has been widely used in aviation industry due to its excellent mechanical properties. It is of great significance to evaluate the ultimate load and damage propagation of composite countersunk head bolt joints for the economy and safety of aircraft joints. In this paper, a three-dimensional model of composite countersunk head bolt lapping is established, and the pre-tightening force of the bolt is applied by virtual thermal deformation method, then the VUMAT user-defined program is written in FORTRAN language though finite element simulation. The selected stiffness degradation mode and 3D Hashin failure criterion are embedded into the progressive damage model to establish the finite element damage prediction model, and study different lap end distance on the composite material single screw countersunk bolt connection structure failure. The results show that the lap end distance mainly affects the shear strength of the connection structure. The smaller the end distance is, the smaller the ultimate bearing strength is. When the short diameter ratio of the lap joint reaches 2.5, the ultimate bearing strength changes little with the increase of the end diameter ratio. The tensile damage of the matrix first appears in the 0° ply of the bottom layer, the fiber compression damage first appears in the turning point of the countersink and straight hole, and the failure element expands along the loading direction until the free boundary fails.

Key words: composite materials, countersunk bolt connection, VUMAT, three-dimensional Hashin failure criterion, progressive damage model

CLC Number:

TB332

YU Fen, LIU Guo-feng, HE Zhen-peng, LI Bai-chun. Analysis of structural strength and progressive damage of countersunk bolt lap joint with CFRP[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(11): 12-20.

References

[1] EGAN B, MCCARTHY M A, FRIZZELL R M, et al. Modelling bearing failure in countersunk composite joints under quasi-static loading using 3D explicit finite element analysis[J]. Composite Structures, 2014, 108: 963-977.
[2] CHANG F K, CHANG K Y. A progressive damage model for laminated composites containing stress concentrations[J]. Journal of Composite Materials, 1987, 21(9): 834-855.
[3] TAN S C. A progressive failure model for composite laminates containing openings[J]. Journal of Composite Materials, 1991, 25(5): 556-577.
[4] CAMANHO P P, MATTHEWS F L. A progressive damage model for mechanically fastened joints in composite laminates[J]. Journal of Composite Materials, 1999, 33(24): 2248-2280.
[5] HASHIN Z. Failure criteria for unidirectional fiber composites[J]. Journal of Applied Mechanics, 1980, 47(2): 329-334.
[6] TSERPES K I, LABEAS G, PAPANIKOS P, et al. Strength prediction of bolted joints in graphite/epoxy composite laminates[J]. Composites Part B, 2002, 33(7): 521-529.
[7] MCCARTHY C T, MCCARTHY M A, LAWLOR V P. Progressive damage analysis of multi-bolt composite joints with variable bolt-hole clearances[J]. Composites Part B: Engineering, 2005, 36(4): 290-305.
[8] YAN Y, WEN W D, CHANG F K, et al. Experimental study on clamping effects on the tensile strength of composite plates with a bolt-filled hole[J]. Composites Part A Applied Science & Manufacturing, 1999, 30(10): 1215-1229.
[9] 王丹勇, 温卫东, 崔海涛. 复合材料单钉接头三维逐渐损伤破坏分析[J]. 复合材料学报, 2005(3): 168-174.
[10] 黄文俊, 孙永波, 程小全, 等. 复合材料层板单钉沉头螺栓连接结构拉伸性能[J]. 材料工程, 2013(12): 8-12.
[11] CHISHTI M, WANG C H, THOMSON R S, et al. Experimental investigation of damage progression and strength of countersunk composite joints[J]. Composite Structures, 2012, 94(3): 865-873.
[12] CHISHTI M, WANG C H, THOMSON R S, et al. Numerical analysis of damage progression and strength of countersunk composite joints[J]. Composite Structures, 2012, 94(2): 645-653.
[13] 黄河源, 赵美英, 万小朋, 等. 复合材料中厚板沉头连接结构强度与损伤失效[J]. 复合材料学报, 2017, 34(3): 557-563.
[14] 江兴亨, 张博平, 林淡, 等. 复合材料沉头双钉单搭接连接静强度分析[J]. 航空计算技术, 2013, 43(1): 89-92.
[15] 余芬, 刘武帅, 王伟韬, 等. 热力耦合作用下复合材料搭接结构强度研究[J]. 机械科学与技术, 2019, 38(5): 796-802.
[16] TSERPES K I, PAPANIKOS P, LABEAS G, et al. Fatigue damage accumulation and residual strength assessment of CFRP laminates [J]. Composite Structures, 2004, 63(2): 219-230.
[17] HART-SMITH L J. Design and analysis of bolted and riveted joints in fibrous composite structures[M]//Recent Advances in Structural Joints and Repairs for Composite Materials. Dordrecht: Springer, 2003: 211-254.
[18] TANLAK N, SONMEZ F O, TALAY E. Detailed and simplified models of bolted joints under impact loading[J]. The Journal of Strain Analysis for Engineering Design, 2011, 46(3): 213-225.
[19] EGAN B, MCCARTHY C T, MCCARTHY M A, et al. Modelling a single-bolt countersunk composite joint using implicit and explicit finite element analysis[J]. Computational Materials Science, 2012, 64: 203-208.
[20] QIN Z Y, YAN S Z, CHU F L. Finite element analysis of the clamp band joint[J]. Applied Mathematical Modelling, 2012, 36(1): 463-477.
[21] LIU W, YU F, HE Z, et al. A progressive damage model introducing temperature field for bolted composite joint with preload[J]. Modelling and Simulation in Materials Science and Engineering, 2019, 27(6): 065011.
[22] MONTAGNE B, LACHAUD F, PAROISSIEN E, et al. Failure analysis of single lap composite laminate bolted joints: Comparison of experimental and numerical tests[J]. Composite Structures, 2020, 238: 111949.