复合材料整体化多墙盒段渐进式失效分析和试验验证

为准确预测复合材料盒段的损伤起始和破坏过程,针对复合材料整体化多墙盒段研究了考虑材料失效的渐进损伤有限元分析技术。首先基于ABAQUS软件,利用标准试验获得的材料力学性能建立了盒段渐进损伤分析模型,分别采用三维Hashin失效准则和平方应力失效准则作为复合材料层板和连接界面的失效判据;然后,基于该模型完成了复合材料整体化多墙盒段后屈曲承载能力的求解,并利用破坏试验对分析模型进行验证。结果表明:结构承载能力和应力的有限元分析结果与试验值吻合良好,预测的失效模式也与试验结果一致,屈曲载荷和承载能力误差在5%以内。所得结论表明考虑层板失效和界面脱粘的分析模型能有效模拟整体化多墙盒段的破坏过程。

Progressive failure analysis and test validation of integral multi-spar composite box

In order to predict the damage initiation and destruction process of composite box accurately,the pro-gressive damage finite element analysis technique of integral multi-spar composite box which took material failure in-to consideration was investigated.Based on ABAQUS software,the progressive damage analysis model of box was established firstly by using the material mechanical property parameters obtained by standard tests,and three dimen-sional Hashin failure criteria and square stress failure criteria were adopted as the failure criteria of composite ply and adhesive interface,respectively.Then,the solution for post-buckling loading capability of the integral multi-spar composite box was accomplished by the model,and the analysis model was validated by failure test.The results show that the finite element analysis results for loading capability and stress of structure coincide well with test val-ues,and the failure mode predicted is also consistent with the test results.The errors of buckling load and loading capability are within 5%.The conclusions obtained show that the analysis model which takes failure of ply and debonding of interface into consideration can simulate the damage process of integral multi-spar box effectively.