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A multi-scale analysis of composite structures: Application to the design of accelerated hygrothermal cycles

机译：复合结构的多尺度分析：在加速湿热循环设计中的应用

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摘要

Hygrothermal cycles are known to cause degradation of fiber-reinforced polymer composite materials due to moisture uptake and thermal expansion. The knowledge of internal stresses due to cyclic environmental conditions is necessary to forecast a possible damage occurrence in the material during its service life. The accelerated cycles are studied so as to define the material geometry and environmental conditions to reproduce the in-service material state in a shorter time. In the present work, a self-consistent (SC) model is used in order to predict the stress state at the microscopic scale (fiber and matrix) induced by the real and accelerated cycles. The main aim is to compare the local states induced by the real and accelerated cycles in particular near to the edges where hold periodic conditions.
机译：已知湿热循环由于吸湿和热膨胀而引起纤维增强的聚合物复合材料的降解。必须了解由于周期性环境条件引起的内部应力，才能预测材料在使用寿命期间可能发生的损坏。对加速循环进行了研究，以便定义材料的几何形状和环境条件，从而在更短的时间内再现使用中的材料状态。在当前的工作中，使用自洽（SC）模型来预测由实际和加速循环引起的微观尺度（纤维和基质）的应力状态。主要目的是比较由实际周期和加速周期诱发的局部状态，特别是在保持周期性条件的边缘附近。

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