湿热环境下复合材料层合板本构模型研究及其应用

近年来复合材料被广泛地应用于航空航天等工程领域。在实际的使用中,复合材料在不同的湿热环境下其力学性能会发生显著变化,针对这一问题,国内外已有大量的试验研究,而对湿热环境下复合材料的本构模型理论的研究则较少。在经典层合板理论基础上引入湿热膨胀系数的概念,通过定义一个无量纲的温度,建立材料弹性常数与湿热参数之间的函数关系,推导出复合材料单层板在湿热力耦合作用下的本构关系,同时加入三维Hashin失效判定准则对层合板的损伤演化及失效模式进行模拟。结果表明:该模型较好地预测了复合材料层合板在不同湿热环境下的弹性响应,为分析实际工程中复合材料结构模型在湿热环境下的力学行为提供了重要参考。

Research and application of the constitutive model of composite laminates in hydrothermal environments

In recent years, composite materials have been widely used in aerospace and other engineering fields. In actual use, the mechanical properties of composites will change significantly in different hydrothermal environments. There have been a large number of experimental studies at home and abroad in response to this problem, while less research has been conducted on the constitutive model theory of composites in different hydrothermal environments. The study of the thermal properties of composite materials is adopted to introduce the concept of hygroscopic expansion coefficient and thermal expansion coefficient on the basis of classical laminated plate theory. We have established the functional relationship between the elastic constants and the thermal parameters of the materials through the definition of a dimensionless temperature, deriving the constitutive equations of the single layer of composite material under the coupling of moisture and heat. Meanwhile, the 3D Hashin failure criteria has been used to simulate the damage evolution and failure mode of the composite laminates. The results show that the model can predict the elastic response of composite laminates in different moist and thermal environments, which provides an important reference to analyze the mechanical behavior of composite material structure in hydrothermal environments.