拉压性能不同纤维增强复合材料的非线性本构模型

为满足在工程应用中对建立拉压性能不同纤维增强复合材料的非线性本构理论的需要, 考虑静水压影响的Drucker-Prager屈服准则与各向异性的Hill屈服准则相结合, 提出了广义Hill屈服准则, 并推广到Sun-Chen的单参数塑性模型中, 建立了考虑拉压异性复合材料的非线性统一本构方程。实验验证结果表明, 运用本文中所建立的本构模型能够很好地描述碳纤维/环氧(IM600/Q133)复合材料在偏轴拉伸和压缩载荷作用下的非线性响应。

Nonlinear constitutive model for fiber reinforced composites with different properties in tension and compression

To meet the engineering application requirements of establishing nonlinear constitutive theory for fiber reinforced composites with different properties in tension and compression, this paper presented a generalized Hill yield criterion, which combines Drucker-Prager yield criterion considering the effect of hydrostatic pressure and Hill yield criterion suitable for anisotropic materials. Based on this theory, Sun and Chen's one-parameter plasticity model was extended to a unified nonlinear constitutive model incorporating the difference between the yield strength in tension and compression. The experimental results show that, the proposed model can be used to accurately predict the off-axis tensile and compressive nonlinear response for carbon fiber/epoxy (IM600/Q133) composites.