Characterization of strength of carbon fiber reinforced polymer composite based on micromechanics
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摘要: 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。Abstract: The micro-mechanics of failure(MMF) is a micromechanics-based failure criterion for composites, which can be applied to design composite accurately and reliably. The strength and mechanical properties of unidirectional laminate of UTS50/E51 were measured by the static tensile loading and compressive loading tests as well as three points bending test. The micro-mechanics model was built to obtain the mechanical and residual thermal stress amplification factors for the key points in the fiber and matrix. The MMF parameters were characterized by using the stress amplification factors and the measured strengths of unidirectional laminate. The failure envelopes were made based on the MMF theory, and compared with that based on Tsai-Wu failure criterion. The carbon fiber reinforced plastic UTS50/E51 is used to demonstrate the application of MMF theory.
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