改进的复合材料T型长桁压损失效的数值分析方法研究

Improved numerical analysis method research on crippling failure of T-shaped composite stringers

针对碳纤维增强树脂基复合材料T型长桁的压损失效,对常用的有限元建模方法进行改进,通过shell-solid混合建模保留填充区细节来提高分析精度。为了比较,另外还建立了不带填充区细节的有限元模型。有限元模型结合渐进损伤分析方法,利用ABAQUS软件进行非线性求解后得到了长桁的屈曲载荷、破坏载荷及失效模式。相应地,制造了T型长桁试验件进行压损试验,对建模方法进行验证。通过对比发现,带填充区模型能提高1%~5%的计算精度,使计算结果与试验值吻合得更好,验证了该改进方法的有效性。

A finite element modeling method based on shell-solid hybrid model with details of the filler is improved to predict and analyze the crippling failure of fiber-reinforced T section composite stringers.Finite element model without details of the filler is established for comparison.Finite Element Model with the consideration of progressive failure analysis is used to obtain buckling load and damage load and failure mode by using nonlinear solution module of ABAQUS software.T section stringer was manufactured and tested to validate the above method.The accuracy of the calculation is improved and an better agreement is found between the analytical prediction and the experimental data when finite element model with the filler is adopted.The validity of the proposed analysis method is proved.