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对玻璃长纤维增强树脂基复合材料(玻璃纤维体积分数为40%、50%)的室温单轴时间相关棘轮行为进行了较系统的单轴应力循环实验研究,讨论了该类复合材料在不同循环加载条件下的棘轮变形特征。结果表明:该类复合材料在非对称应力循环下将产生一定的棘轮变形,棘轮应变值随外加的应力幅值和平均应力的增加而增加;玻璃长纤维的引入使复合材料抵抗棘轮变形的能力明显强于未增强树脂基体材料,复合材料的棘轮变形量随玻璃长纤维含量的升高而下降;在室温下,复合材料的棘轮行为也具有明显的时间相关特性,棘轮应变值依赖于应力加载速率和峰值保持时间,随应力加载速率的下降和峰值保持时间的增加明显增加。
The uniaxial stress cycling experiments of single-axis time-dependent ratcheting at room temperature were carried out on glass fiber reinforced resin matrix composites (glass fiber volume fraction 40%, 50%). The effects of different cyclic Ratcheting deformation under loading conditions. The results show that this type of composite material will produce some ratcheting deformation under asymmetric stress cycling. The ratchet strain value will increase with the increase of applied stress amplitude and average stress. The introduction of glass long fiber will make the composite resist ratcheting deformation The ratchet deformation of composites decreased with the increase of glass fiber content. Ratchet behavior of the composites also had obvious time-dependent properties at room temperature. The ratchet strain was dependent on the stress loading Rate and peak hold time, with the stress loading rate decreased and the peak hold time increased significantly.