碳纤维/双马树脂基复合材料在热循环过程中热应力分布的数值模拟
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摘要
用有限元分析方法模拟热循环过程中碳纤维/双马树脂基复合材料的热应力分布,采用抛物线屈服准则分析复合材料的潜在破坏区域,并结合有限元生死单元技术揭示复合材料在热应力作用下的微裂纹分布。结果表明,复合材料自由端处的热应力大于其内部区域,其中最大热应力位于自由端处富树脂区的纤维表面;复合材料的潜在破坏区域位于自由端沿纤维与树脂基体间的界面处,主要的损伤形式为热应力引发微裂纹导致自由端处产生界面脱粘破坏。在进一步的热循环过程中,热应力得到一定程度的缓解并重新分布,由复合材料的自由端向内部区域延伸,导致微裂纹的进一步扩展而使复合材料的界面脱粘程度加重。对CF/BMI复合材料在热循环过程中性能演化的实验结果表明,热循环效应能够引发纤维与树脂基体之间的界面处形成微裂纹,导致复合材料的界面粘接性能下降。模拟结果预期了CF/BMI复合材料在实际热循环过程中的潜在破坏区域,并解析了热循环过程中导致复合材料界面粘接性能降低的根本原因,表明模拟结果与实验结果相符。
Finite element analysis was used to analyze thermal stress distribution in CF/BMI composite under exposure to thermal cycles.Parabolic failure criterion was used to predict the potential failure zone in composite.Birth and death element technique was used to reveal the microcracks distribution in composite induced by thermal stress.Thermal stress at composite free end zone is higher than that in inner zone,and the maximum stress locates at the fiber surface in resin-rich area of free end zone. The potential failure zones locate at free end zone with the microcracks distributed along the interface, thus leads to interfacial debonding failure in composite.During the following thermal cycle,the thermal stress which is alleviated to some extent and redistributed,extends from free end zone to inner zone,thus exacerbates the degree of interfacial debonding.Properties evolution of CF/BMI composite subjected to thermal cycles were investigated,showing that the interfacial bond property was decreased due to the formation of microcracks along the interface.The numerical simulation results are in good agreement with the experiment results,which reasonably expect the potential failure zone in composite and analyze the reason of decrease in interfacial bond property induced by thermal cycles.
Finite element analysis was used to analyze thermal stress distribution in CF/BMI composite under exposure to thermal cycles.Parabolic failure criterion was used to predict the potential failure zone in composite.Birth and death element technique was used to reveal the microcracks distribution in composite induced by thermal stress.Thermal stress at composite free end zone is higher than that in inner zone,and the maximum stress locates at the fiber surface in resin-rich area of free end zone. The potential failure zones locate at free end zone with the microcracks distributed along the interface, thus leads to interfacial debonding failure in composite.During the following thermal cycle,the thermal stress which is alleviated to some extent and redistributed,extends from free end zone to inner zone,thus exacerbates the degree of interfacial debonding.Properties evolution of CF/BMI composite subjected to thermal cycles were investigated,showing that the interfacial bond property was decreased due to the formation of microcracks along the interface.The numerical simulation results are in good agreement with the experiment results,which reasonably expect the potential failure zone in composite and analyze the reason of decrease in interfacial bond property induced by thermal cycles.
引文
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8 P.Rosso,K.Varadi,FE macro/micro analysis of thermal residual stresses and failure behavior under transverse tensile load of VE/CF-fibre bundle composites,Composite Science and Technology,66(16),3241(2006)
9 L.G.Zhao,N.A.Warrior,A.C.Long,A micromechanical study of residual stress and its effect on transverse failure in polymer-matrix composites,International Journal of Solids and Structures,43,5449(2006)
10 C.Lu,P.Chen,Y.Gao,W.Qi,Q.Yu,Thermal stress distri- ??bution in CF/EP composite in low earth orbit,Journal of Composite Materials,44,1729(2010)
11 M.Gherlone,M.D.Sciuva,Thermo-mechanics of undamaged and damaged multilayered composite plates:a sublaminates finite element approach,Composite Structures, 81(1),125(2007)
12 C.Lu,P.Chen,B.J.Yu,Computer simulation of thermal residual stressof carbon fiber/PPESK composite,Advanced Composites Letters,16(1),33(2007)
13 C.Lu,P.Chen,Q.Yu,J.L.Gao,B.J.Yu,Thermal residual stress distribution in carbon fiber/novel thermal plastic composite,Applied Composite Materials,15,157(2008)
14 Q.Yu,P.Chen,Y.Gao,J.J.Mu,Y.W.Chen,C.Lu,D.Liu, Effects of vacuum thermal cycling on mechanical and physical properties of high performance carbon/bismaleimide composite,Materials Chemistry and Physics,130, 1046(2011)
2 CHEN Ping,LIAO Mingyi,Polymer Synthetic Material Science,the second edition(Beijing,Chemical Industry Press,2010) p.153 (陈平,廖明义,高分子合成材料学,第二版(北京,化学工业出版社,2010)p.153)
3 ZHAO Qusen,Low cost of QY8911 bismaleimide resin and its composites,Materials Review,15(10),2(2001) (赵渠森,QY8911双马来酰亚胺树脂和复合材料低成本,材料导报,15(10),2(2001))
4 K.B.Shin,C.G.Kim,C.S.Hong,H.H.Lee,Prediction of failure thermal cycles in graphite/epoxy composite materials under simulated low earth orbit environments,Composites Part B-Engmeering,31,223(2000)
5 T.Shimokawa,H.Katoh,Y.Hamaguchi,S.Sanbongi, H.Mizuno,Effect of thermal cycling on microcracking and strength degradation of high temperature poly composite materials for use in next-generation SST structures,Journal of Composite Materials,36,885(2002)
6 M.C.Lafarie-Frenot,Damage mechanisms induced by cyclic ply-stresses in carbon-epoxy laminates:Environmental effects,International Journal of Fatigue,28, 1202(2006)
7 Z.Mei,D.D.L.Chung,Thermal stress-induced thermoplastic composite debonding,studied by contact electrical resistance measurement,International Journal of Adhesion and Adhesives,20,135(2000)
8 P.Rosso,K.Varadi,FE macro/micro analysis of thermal residual stresses and failure behavior under transverse tensile load of VE/CF-fibre bundle composites,Composite Science and Technology,66(16),3241(2006)
9 L.G.Zhao,N.A.Warrior,A.C.Long,A micromechanical study of residual stress and its effect on transverse failure in polymer-matrix composites,International Journal of Solids and Structures,43,5449(2006)
10 C.Lu,P.Chen,Y.Gao,W.Qi,Q.Yu,Thermal stress distri- ??bution in CF/EP composite in low earth orbit,Journal of Composite Materials,44,1729(2010)
11 M.Gherlone,M.D.Sciuva,Thermo-mechanics of undamaged and damaged multilayered composite plates:a sublaminates finite element approach,Composite Structures, 81(1),125(2007)
12 C.Lu,P.Chen,B.J.Yu,Computer simulation of thermal residual stressof carbon fiber/PPESK composite,Advanced Composites Letters,16(1),33(2007)
13 C.Lu,P.Chen,Q.Yu,J.L.Gao,B.J.Yu,Thermal residual stress distribution in carbon fiber/novel thermal plastic composite,Applied Composite Materials,15,157(2008)
14 Q.Yu,P.Chen,Y.Gao,J.J.Mu,Y.W.Chen,C.Lu,D.Liu, Effects of vacuum thermal cycling on mechanical and physical properties of high performance carbon/bismaleimide composite,Materials Chemistry and Physics,130, 1046(2011)