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 time-dependent ratcheting of continuous glass fiber reinforced polymer resin matrix composites(40%, 50%glass fiber volume fractions)was experimentally observed at room temperature under the uniaxial stress-controlled cyclic loading, and the evolution features of the ratcheting of the composites presented under different cyclic loading conditions were discussed. The results show that the ratchering Occurs in the composites during the asymmetrical uniaxial stress-controlled cyclic loading(i. e. , the applied mean stress is not zero), and the ratcheting strain increases as the applied stress amplitude and mean stress increase;however, the addition of continuous glass fibers into the polymer matrix increases the resistance of the composites to the ratcheting deformation, and the ratcheting strain produced in the cyclic loading decreases with the increase of glass fiber volume fraction;the ratcheting of the composites also presents apparent time-dependence, even at room temperature, i. e. , the ratcheting depends upon the stress loading rate and hold time at the peak stress. and the value of rateheting strain increases apparently with the decrease of stress loading rate and increase of hold time at peak stress during the uniaxial stress-controlled cyclic loading.
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