Shen Jiongyao, Liu Zhongxu, Guo Junhua
School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
Polymers (Basel). 2025 Jun 10;17(12):1613. doi: 10.3390/polym17121613.
The LaRC02 criterion is a classical criterion for determining fiber kinking failure of UD laminates under longitudinal compression (LC), but its basis for determining matrix cracking in a fiber kinking coordinate system is based on stress-invariant theory rather than on a physical mechanism. Herein, three Puck-like physical-mechanism-based inter-fiber failure criteria are extended to LC failure of UD composites, and thus three failure criteria (denoted as LC-Guo, LC-Li, and LC-Puck failure criteria) are constructed for fiber kinking failure determination. The stresses in the global coordinate system are transformed to the fiber kinking coordinate system by a three-level coordinate system transformation, and then the failure determination is performed using the three Puck-like criteria. The results show that the overall accuracy of the three proposed criteria is higher than that of the LaRC02 criterion, especially the LC-Guo criterion. Additionally, an analysis of the influence of material properties shows that the failure envelope curves tend to be conservative, and the predicted off-axial compression strength decreases as the transverse compression strength and in-plane shear strength increase and the transverse tensile strength decreases. This work proposes a more reasonable assessment methodology for the determination of LC failure of UD composites, which has important theoretical significance and engineering value.
LaRC02准则是用于确定单向层合板在纵向压缩（LC）下纤维扭结失效的经典准则，但其在纤维扭结坐标系中确定基体开裂的依据是基于应力不变理论，而非物理机制。在此，将三个基于Puck类物理机制的纤维间失效准则扩展到单向复合材料的纵向压缩失效，从而构建了三个用于确定纤维扭结失效的失效准则（分别记为LC - Guo、LC - Li和LC - Puck失效准则）。通过三级坐标系变换将全局坐标系中的应力转换到纤维扭结坐标系，然后使用这三个Puck类准则进行失效判定。结果表明，所提出的三个准则的整体精度高于LaRC02准则，尤其是LC - Guo准则。此外，对材料性能影响的分析表明，失效包络曲线趋于保守，并且预测的偏轴压缩强度随着横向压缩强度和平面内剪切强度的增加以及横向拉伸强度的降低而减小。这项工作为单向复合材料纵向压缩失效的判定提出了一种更合理的评估方法，具有重要的理论意义和工程价值。
