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首页> 外文会议>Proceedings of the Asian Pacific Conference Fracture and Strength >Chemical Shrinkage and Residual Stresses In Laminated Composites During Cure
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Chemical Shrinkage and Residual Stresses In Laminated Composites During Cure

机译：固化过程中层压复合材料中的化学收缩和残余应力

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摘要

The residual stress that occurs in fiber-reinforced thermosetting composite materials during cure is one of the severe factors that can deteriorate the performance of composite structures. To investigate residual stresses occurring in laminated composites during cure, an incremental viscoelastic constitutive equation is derived as a function of temperature, degree of cure and chemical shrinkage. A finite element program is developed on the basis of a 3-D degenerated shell element and the first order shear deformation theory. Experiments were performed to measure the coefficients of chemical shrinkage of the Hercules AS4/3501-6 composite during cure. Residual strains were measured using strain gages during cure and compared with the results of finite element analysis. Good agreement is found between numerical and experimental results. It is found that the chemical shrinkage seriously affects the residual strains of the composite during cure.
机译：在固化过程中纤维增强热固性复合材料中发生的残余应力是严重因素之一，可以恶化复合结构的性能。为了研究固化过程中层叠复合材料中发生的残留应力，衍生增量粘弹性本构体等式的函数，用于温度，固化程度和化学收缩。基于3-D退化的壳元件和第一阶剪切变形理论，开发有限元件。进行实验以测量固化过程中母细胞的化学收缩系数。在固化过程中使用应变测量测量残留菌株，并与有限元分析的结果进行比较。数值和实验结果之间发现了良好的一致性。结果发现化学收缩严重影响固化过程中复合材料的残留菌株。

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