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微观力学强度理论(MMF)是一种新型的基于物理失效模式的复合材料强度理论。通过对碳纤维/树脂(UTS50/E51)复合材料单向层合板进行纵向、横向静载拉伸、压缩和弯曲试验,得到层合板的基本力学性能和宏观强度指标。建立了碳纤维增强树脂基复合材料微观力学模型,获取树脂基体和纤维不同位置的机械载荷应力放大系数和热载荷应力放大系数。结合获取的应力放大系数及试验测得的单向层合板宏观强度,计算出层合板组分的MMF强度特征值。绘制了基于MMF强度理论的层合板破坏包络线,并与Tsai-Wu失效准则预测结果进行对比。实现了对UTS50/E51层合板MMF强度特征值的表征。
Micromechanical strength theory (MMF) is a new theory of composite strength based on physical failure modes. The basic mechanical properties and macroscopic strength indexes of the laminate were obtained by longitudinal, transverse static load drawing, compression and bending tests on unidirectional laminates of carbon fiber / resin (UTS50 / E51) composites. The microcosmic mechanical model of carbon fiber reinforced resin matrix composites was set up to obtain the mechanical load stress amplification factor and thermal load stress amplification factor at different positions of the resin matrix and fiber. Combined with the obtained stress amplification factor and the macroscopic strength of the unidirectional laminate, the MMF strength characteristics of the laminate were calculated. The failure envelope of laminates based on the MMF strength theory is plotted and compared with the predicted results of Tsai-Wu failure criterion. The characterization of MMF strength characteristics of UTS50 / E51 laminates has been achieved.