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提出了一种新的基于物理失效模式的复合材料跨尺度失效准则,从细观层面分别对纤维和基体的失效模式进行了表征,将纤维失效分为拉伸失效和压缩失效,将基体失效分为膨胀失效和扭曲失效。建立了相应的失效准则及损伤演化方法。通过正方形和六边形的代表体积单元(RVE)模型,计算了宏观应力到细观应力的机械应力放大系数和热应力放大系数。以IM7/5250-4复合材料拉伸试验作为算例对失效模型进行了验证。计算结果与试验结果吻合较好,表明跨尺度失效准则能够准确预测复合材料层合板的破坏。
A new cross-scale failure criteria for composite materials based on physical failure modes was proposed. The failure modes of fibers and matrixes were characterized respectively from the microscopic level. The failure of fibers was divided into tensile failure and compression failure. For expansion failure and distortion failure. The corresponding failure criterion and damage evolution method are established. The mechanical stress amplification factor and thermal stress amplification factor from macroscopic stress to mesoscopic stress are calculated by RVE model of square and hexagon. The failure model was verified by using IM7 / 5250-4 composite tensile test as an example. The calculated results are in good agreement with the experimental results, indicating that cross-scale failure criteria can accurately predict the failure of composite laminates.