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Mode-Independent and Mode-Interactive Failure Criteria for Unidirectional Composites Based on Strain Energy Density

机译：基于应变能密度的单向复合材料的模式无关和模式交互式故障标准

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摘要

The strain energy released plays a crucial role in generating macroscopic failure in unidirectional (UD) composites. This paper proposes two new strain energy-based failure criteria, regarding fiber-dominated and matrix-dominated failure mode as independent and interactive, respectively. The failure expression is formulated based on rigorous mathematical deducing, accompanied by physical interpretation. Based on the lack of experimentally feasible multi-axial strengths, a predefined assumption of infinite strength under bi-axial and tri-axial compressive stress provides the possibility for determining all coefficients only by using conventional uniaxial strengths. The failure envelopes predicted by the proposed criteria have been validated against experimental results under biaxial, off-axis and tri-axial loading cases. A better agreement with physical reality was achieved by the failure mode-interactive criterion, suggesting a wide range of applicability.
机译：释放的应变能量在在单向（UD）复合材料中产生宏观失败时起着至关重要的作用。本文提出了两种新的应变能源基故障标准，关于光纤主导和矩阵主导的故障模式分别分别为独立和交互式。基于严谨的数学推导，制定失败表达，伴随着物理解释。基于缺乏实验可行的多轴强度，在双轴和三轴压缩应力下的无限强度的预定假设仅通过使用传统的单轴强度来确定所有系数的可能性。通过拟议标准预测的故障包络已被验证在双轴，轴外轴上的实验结果下进行了验证。通过失败模式 - 互动标准实现了与物理现实的更好协议，旨在提出各种适用性。

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