论文部分内容阅读
对玻璃短纤维增强树脂基复合材料(短纤维体积分数:28%,40%)的室温单轴循环棘轮行为进行了实验研究,讨论了复合材料在不同加载条件下的棘轮变形特征。结果表明:该复合材料在宏观层次上表现出与基体相类似的棘轮变形规律,即在非对称应力循环下也将产生明显的棘轮变形,并随应力幅值和平均应力的增加而增加;树脂基复合材料的棘轮行为具有明显的时间相关特性,棘轮应变值依赖于应力率和峰值保持时间。在建立玻璃短纤维增强不饱和聚酯树脂基复合材料棘轮行为的本构模型时必须考虑基体的黏性变形特征。
The uniaxial ratcheting behavior of glass staple fiber reinforced resin matrix composites (short fiber volume fraction: 28%, 40%) at room temperature was investigated. The ratcheting deformation of the composites under different loading conditions was discussed. The results show that the composite shows a ratchet deformation similar to the matrix at the macroscopic level, that is, the ratchet deformation will also occur under asymmetric stress cycling and increase with the increase of stress amplitude and average stress. The resin The ratcheting behavior of the matrix composites has obvious time-dependent properties. The ratcheting strain depends on the stress rate and the peak hold time. In the establishment of glass staple fiber reinforced unsaturated polyester resin-based composite ratcheting behavior constitutive model must consider the matrix of viscous deformation characteristics.