2.5D C/SiC复合材料连续损伤本构模型

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2.5D C/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。 

Continuum damage constitutive model of 2.5D C/SiC composites

A continuum damage constitutive model of 2.5D C/SiC composites containing both tensile and shear damage variables were established based on continuum damage mechanics. Tensile and shear tests were conducted to obtain the stress-strain curves, and the test curves were fitted to obtain parameters of damage variable evolution. The constitutive model was then embedded into commercial finite element software ANSYS by subroutine technology and the finite element method was used to calculate the stress-strain curves of materials. The coupling effect of tensile and shear damage was considered. The stress-strain curves under off-axis tensile condition was calculated. The results show that the stress-strain curves along warp and weft direction tensile and in-plane shear agree well with the test results and the maximum deviation are respectively 4.30%, 3.09% and 3.73%; the calculated off-axis tensile stress-strain curve is also consistent with the test data.