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首页> 外文会议>Symposium on composite materials: Fatigue and fracture >Analysis of the Hygrothermal Effects and Parametric Study of the Edge Crack Torsion (ECT) Mode III Test Layups
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Analysis of the Hygrothermal Effects and Parametric Study of the Edge Crack Torsion (ECT) Mode III Test Layups

机译：边缘裂纹扭转（ECT）模式III试验上差的湿热效应和参数研究分析

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A shear deformation theory including residual thermal and moisture effects is developed for the analysis of either symmetric or asymmetric laminates with midplane edge delamination under torsional loading. The theory is based on an assumed displacement field that includes shear deformation. The govening equations and boundary conditions are obtained from the principle of virtual work. The anlaysis the (90/(+-45)_n/(-from+45)s/90)_s edge crack torsion (ETC) Mode III test layup indicates that there are no hygrothermal effects on the Mode III strain energy release rate because the laminate, and both sublaminates above and below the delamination, are symmetric layups. A further parametric study reveals that some other layups can have negligible hygrothermal effects even when the sublaminates above and below the delamination are not symmetric about their own midplanes. However, these layups may suffer from distortion after the dcuring process. Another interesting set of layups investigated is a class of antisymmetric laminates with (+-(theta/(theta-90)_2/theta))_n layups. It is observed that when n takes on even numbers (2 and 4), both hygrothermal and Model I effects can be neglected. From this points of view, these layups provide a way to determine the Mode III toughness between two dissimilar layers. However, when n takes on odd numbers (1 and 3). both hygrothermal and Mode I effects may be strong in these layups. In particular, when theta equals 45deg, the layups are free from both hygrothermal and Mode I effects irrespective of n.
机译：开发了一种剪切变形理论，包括在扭转载荷下分析具有中间平面边缘分层的对称或不对称层压材料的对称或不对称层压材料。该理论基于假设的位移场，包括剪切变形。从虚拟工作原理获得Govening方程和边界条件。 Anthaysis（90 /（+ - 45）_n /（ - 来自+ 45）S / 90）_s边缘裂纹扭转（等）模式III试验敷模表明，对模式III应变能释放率没有湿热效应，因为分层的层压材料和分层后低于和低于的子胺。另一个参数研究表明，即使在分层的子宫内部和下方的子宫内部对其自己的中间板不对称，其他一些上篮的湿热效应也可能具有可忽略的湿热效应。然而，这些汇位可能在DECURE过程之后遭受失真。调查的另一组有趣的上篮是一类具有（+ - （θ-90）_2 /θ）_ n叠层的反对称层压材料。观察到，当N甚至数量（2和4）时，湿热和模型I效应都可以忽略。从该观点来看，这些上篮提供了一种方法来确定两个不同层之间的模式III韧性。但是，当n呈奇数（1和3）时。湿热和模式I效应都可能在这些上篮中强。特别是，当θ等于45deg时，汇款没有湿热和模式I效应，而不管是n。

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