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基于连续损伤力学建立了一种包含拉伸与剪切损伤变量的2.5DC/SiC复合材料连续损伤本构模型。分别开展了拉伸和剪切试验,获得应力-应变曲线,并通过拟合试验曲线获得各损伤变量的演化参数。采用子程序技术将本构模型嵌入商用有限元软件ANSYS,应用有限元法计算了材料的应力-应变曲线。考虑了拉剪损伤耦合效应,计算了偏轴拉伸情况下的应力-应变曲线。结果表明:沿经纱拉伸、沿纬纱拉伸以及面内剪切的应力-应变曲线与试验结果吻合,最大偏差依次为4.30%、3.09%及3.73%;偏轴拉伸计算与试验应力-应变曲线也吻合较好。
A continuous damage constitutive model of 2.5DC / SiC composites with tensile and shear damage variables was established based on the continuous damage mechanics. The tensile and shear tests were carried out respectively to obtain the stress-strain curves. The evolution parameters of the damage variables were obtained by fitting the test curves. The subroutine technology is used to embed the constitutive model into the commercial finite element software ANSYS. The stress-strain curve of the material is calculated by finite element method. Considering the coupling effect of tensile shear damage, the stress-strain curve under the condition of eccentric stretching is calculated. The results show that the stress-strain curves along the warp yarn, the weft yarn and the in-plane shear yarn agree well with the experimental results. The maximum deviations are 4.30%, 3.09% and 3.73%, respectively. The curve also fits well.