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首页> 外文期刊>Journal of thermal stresses >EFFECT OF RESIDUAL STRESS ON INTERLAMINAR FRACTURE TOUGHNESS OF CFRP LAMINATES
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EFFECT OF RESIDUAL STRESS ON INTERLAMINAR FRACTURE TOUGHNESS OF CFRP LAMINATES

机译：残余应力对CFRP层压板层间断裂韧性的影响

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摘要

In the present study, an effect of residual stress in CFRP laminates for the interlaminar fracture toughness was investigated in detail The boundary element method based on the Laplace transform were employed to calculate the residual stress and interlaminar fracture toughness of the CFRP laminates. The relaxation moduli of the CFRP laminates were estimated by unidirectional compression creep test experimentally. Using CFRP specimens of orthogonal stacking sequence [0°/90°/0°], double cantilever beam (DCB) test for opening mode crack and end notch flexure (ENF) test for shear mode crack were introduced to obtain the actual fracture toughness of CFRP laminates, where the effect of the residual stress in the cooling sequence of the making process was taken into account. From the experimental results and numerical demonstrations by BEM, it was shown that there is a possibility of underestimation of the interlaminar fracture toughness if it is calculated by elastostatic analysis neglecting the residual stress. On the other hand, there is a possibility of overestimation of the toughness when thermoelastic analysis is applied without thermo-viscoelastic properties.
机译：在本研究中，详细研究了CFRP层压板中残余应力对层间断裂韧性的影响。采用基于Laplace变换的边界元方法计算了CFRP层压板的残余应力和层间断裂韧性。 CFRP层压板的松弛模量通过单向压缩蠕变试验进行了实验评估。使用正交堆积顺序[0°/ 90°/ 0°]的CFRP标本，引入双悬臂梁（DCB）测试的开模裂纹和端部切口挠曲（ENF）测试的剪切模式的裂纹，以获得实际的断裂韧性。 CFRP层压板，其中考虑了在制造过程的冷却顺序中残余应力的影响。从BEM的实验结果和数值论证表明，如果通过忽略残余应力的弹力分析计算出层间断裂韧性，则可能会低估该断裂韧性。另一方面，当在没有热粘弹性的情况下进行热弹性分析时，可能会高估韧性。

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