【摘要】 基于复合材料刚度连续折减方案,结合三维Hashin失效准则,建立了复合材料渐进损伤分析模型,编写了模型对应的用户材料子程序(UMAT)。通过ABAQUS调用该程序对碳纤维增强复合材料曲梁四点弯曲进行仿真,将仿真结果与试验结果进行对比,验证了渐进损伤分析模型的有效性。分析了复合材料曲梁的损伤失效行为,发现在弯曲载荷作用下,碳纤维增强复合材料曲梁主要的失效模式是曲梁弯角区域的基体拉伸失效与拉伸分层失效,分层失效发生后扩展迅速,曲梁迅速失去承载能力最终失效,层间拉伸应力过大是导致复合材料曲梁发生分层失效的主要原因。更多还原

【Abstract】 Based on the continuous stiffness reduction scheme of composite materials and the three-dimensional Hashin failure criterion, the progressive damage analysis model of composite materials is established, and the user material subroutine(UMAT) corresponding to the model is compiled. The program is called by ABAQUS to simulate the four-point bending of carbon fiber reinforced composite curved beams. The simulation results are compared with the experimental results, and the effectiveness of the progressive damage analysis model is verified. The failure behavior of composite curved beams is analyzed. It is found that under bending load, the main failure modes of carbon fiber reinforced composite curved beams are tensile delamination failure and matrix tensile failure in the curved region. After the tensile delamination failure occurred, it expanded rapidly, the composite curved beam quickly lost the bearing capacity and finally failed. The main cause of delamination failure of the composite curved beam is the excessive interlaminar tensile stress.更多还原