一种碳纤维织物增强复合材料应变率相关的各向异性强度准则

Strain rate-dependent Tsai-Hill strength criteria for a carbon fiber woven reinforced composite

为了获得一种碳纤维二维正交平纹机织布增强树脂基复合材料在一维应变状态下的强度准则,在已完成的准静态和动态压缩实验的基础上,拟合出了单轴压缩下三个主方向上的计及应变率的应力-应变关系式,进而得到初始屈服应力和压缩破坏强度与应变率相关性表达式。依据该表达式,得到了该复合材料在一维应变下考虑应变率效应的Tsai-Hill屈服强度和破坏强度准则方程。通过计算,考察了Tsai-Hill屈服强度和破坏强度准则随应变率的变化规律。结果表明,本文中研究的复合材料的强度性能,不但存在应变率效应,而且这种效应是各向异性的。

To achieve the strength criteria under one-dimensional strain condition for a kind of carbon fiber two-dimensional orthogonal plain woven reinforced polymer matrix composite, formulas were proposed to describe the strain rate-dependent stress-strain relationships in its three principal directions respectively, according to just completed quasistatic and dynamic compression experiments. Then the relationships between strain rate and initial yield strength or compression failure strength for the composite were demonstrated. Based on the results, the strain rate-dependent Tsai-Hill yield and failure criteria under one-dimensional strain condition were achieved. The variation of the Tsai-Hill yield and failure criteria with increasing strain rate was computationally obtained. Results show the strength properties of the researched composite are related to strain rate, and the strain rate effects are anisotropic.