碳纤维复合材料胶铆混合修理结构静载拉伸失效

doi:10.7527/S1000-6893.2023.28676

Abstract

Abstract:

The experimental research was conducted on the intact composite plate and the composite bonded-rivet hybrid repairing structure， aiming at the tensile failure of carbon fiber composite bonded-rivet hybrid repairing structure. The load bearing ability and strain distribution mode during stretching and failure were analyzed. Through finite element simulation， the initiation and propagation of damage in the adhesive layer and mother board of the composite bonded-rivet hybrid repairing structure were studied. Load division research was carried out on different positions in the hybrid repairing structure to analyze its load bearing mode and load transmission route， further revealing its failure mode. The results show that under tensile load， the adhesive layer starts to fail first and expands inward along two edges of the load direction due to peeling stress caused by patch warping resulting from eccentric loading during stretching. After most of the adhesive layer fails， failure of the mother board begins from 90° layers outside row rivet holes and expands perpendicular to the load direction. Subsequently， ±45° and 0° layers exhibit similar damage patterns. During stretching， part of the tensile load can be transmitted to the patch through both adhesive layer and rivets， thereby improving mechanical properties ofthe hybrid repairing structure.

Key words: composite materials, adhesive-rivet hybrid repair, finite element analysis, failure mode, tensile strength

CLC Number:

V258⁺.3

Liping LIU, Yuyang QI, Yueguo LIN, Rui BAO, Jianxin XU, Zhenyu FENG, Guanghui QING. Tensile failure of carbon fiber composite material bonded-rivet hybrid repaired structure[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(24): 428676.

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T700/BA9916材料性能	数值
11方向上的弹性模量E₁₁/GPa	121.0
22/33方向上的弹性模量E₂₂=E₃₃/GPa	8.7
12/13方向上的剪切模量G₁₂=G₁₃/GPa	4.16
23方向上的剪切模量G₂₃/GPa	3.00
12/13方向上的泊松比ν₁₂=ν₁₃	0.30
23方向上的泊松比ν₂₃	0.45
x方向的拉伸强度极限X_T/MPa	2 395
x方向的压缩强度极限X_C/MPa	1 209
y/z方向的拉伸强度极限Y_T=Z_T/MPa	62.5
y/z方向的压缩强度极限Y_C=Z_C/MPa	207.0
12/13方向的剪切强度极限S₁₂=S₁₃/MPa	134.6
23方向的剪切强度极限S₂₃/MPa	97.0

J116B胶粘剂性能	数值
法向弹性模量E_nn/GPa	1.00
切向弹性模量E_ss=E_tt/GPa	1.74
法向极限应力σ_0，n/MPa	14.6
切向极限应力σ_0，s=σ_0，t/MPa	27.5
法向、切向剪切模量 G_c，n=G_c，s=G_c，t/（N·mm^-1）	1.0

层合板类型	修理方式	组号	试验件编号	补片长度/mm
30 mm损伤板	胶铆修理	H30	1~3	157.5
60 mm损伤板	胶铆修理	H60	4~6	187.5
完好板	无修理	W	7~9	无补片

组号	平均失效载荷/kN	拉伸强度恢复率/%
H30	140.06	77.33
H60	129.39	71.44
W	181.12	无拉伸

组号	最大失效载荷/N		误差/%
组号	仿真	实验	误差/%
H30	158 077	140 060	12.86
H60	118 353	129 390	-8.53

Tensile failure of carbon fiber composite material bonded-rivet hybrid repaired structure

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