Laminate composites contain holes as a means of connection in industrial applications. A better understanding of the mechanical properties of open-hole components is necessary. Herein, progressive damage postbuckling analysis models are proposed for investigation of tensile damage and compressive buckling behaviors of open-hole laminate composites. The progressive damage model is based on failure criteria provided by the continuum damage mechanics model; virtual crack closure technology was employed to calculate the energy release rate for crack delamination in compressive postbuckling analysis. The models were utilized to analyze variations in the tensile and compressive mechanical properties, failure process, and buckling evolution of open-hole laminate composites using finite element analysis. The tensile failure patterns and failure processes of plies with different open-hole laminate composite angles were obtained and analyzed. Buckling characteristics, as well as the progression of buckling onset, buckling propagation, crack delamination, unstable delamination, and global buckling, were investigated. The influence of delamination crack length and crack distribution on the buckling properties of open-hole laminate composites are discussed in detail. Additionally, unstable and stable buckling characteristics were examined. The numerical results were in good agreement with theoretical and experimental results; damage initiated at the edge of a hole propagated to two sides with the onset of matrix damage, followed by fiber damage. The fiber damage of a 0°-ply led ultimately to laminate failure. The laminate with a symmetrical crack distribution showed stable buckling, whereas a short, nonsymmetrical distribution of cracks usually led to unstable buckling and delamination.

中文翻译：

---

开孔层压复合材料的拉伸渐进损伤和压缩后屈曲分析

层压复合材料包含孔作为工业应用中的连接方式。有必要更好地了解裸眼组件的机械性能。在此，提出了渐进式损伤后屈曲分析模型，用于研究开孔层压复合材料的拉伸损伤和压缩屈曲行为。渐进式损伤模型基于连续介质损伤力学模型提供的失效准则；采用虚拟裂纹闭合技术计算压缩后屈曲分析中裂纹分层的能量释放率。这些模型用于使用有限元分析来分析开孔层压复合材料的拉伸和压缩机械性能、失效过程和屈曲演变的变化。获得并分析了不同开孔层压复合材料角度的层板的拉伸破坏模式和破坏过程。研究了屈曲特性，以及屈曲开始、屈曲传播、裂纹分层、不稳定分层和整体屈曲的进展。详细讨论了分层裂纹长度和裂纹分布对开孔层压复合材料屈曲性能的影响。此外，还检查了不稳定和稳定的屈曲特性。数值结果与理论和实验结果吻合良好；在孔边缘开始的损伤随着基体损伤的开始传播到两侧，然后是纤维损伤。0° 层的纤维损坏最终导致层压板失效。