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建立了预测含初始脱粘缺陷复合材料加筋壁板渐进压溃响应的数值分析模型。该模型综合考虑了复合材料层合板的纤维失效、基体失效和纤维-基体剪切失效三种典型的面内损伤模式,并通过编写用户自定义材料子程序VUMAT实现面内失效类型的判断和相应材料性能的折减;在壁板和筋条连接界面应用虚裂纹闭合技术(VCCT)计算层间裂纹前缘的应变能释放率,并结合B-K混合模式准则控制缺陷的起裂以模拟脱粘的扩展演化过程;采用显式动力学方法准静态分析结构在压缩载荷下的屈曲、后屈曲直至最终压溃的响应过程。数值分析结果与文献试验、数值结果吻合良好,验证了模型的合理性和有效性,并详细研究了复合材料脱粘加筋壁板的损伤演化过程和渐进压溃行为。
A numerical model was established to predict the progressive collapse of stiffened panels with initial debonding defects. The model takes into account three typical in-plane damage modes, including fiber failure, matrix failure and fiber-matrix shear failure, of composite laminates. By means of compiling user-defined material subroutine VUMAT, the in-plane failure types are judged and correspondingly The VCCT was used to calculate the strain energy release rate of the interlaminar crack front and the BK mixing mode was used to control the initiation of defects to simulate the debonding Expanding the evolutionary process; using explicit dynamic method to quasi-static analysis of the structure buckling under compressive load, post-buckling until the final collapse of the response process. The results of numerical analysis are in good agreement with the experimental data and numerical results. The results show the rationality and validity of the model. The damage evolution process and progressive collapse behavior of the debonded composite panels are studied in detail.