用增强刚度和质量稳定的纤维复合材料切口试样逐渐PostPeak软化的直接测试
Direct Testing of Gradual PostPeak Softening of Notched Specimens of Fiber Composites Stabilized by Enhanced Stiffness and Mass
摘要：
对目前使用的液压伺服试验机上纤维复合材料断裂试验的静态和动态分析表明，它们的夹具太软太轻，不能观察峰后软化。在对试验装置进行静态和动态分析的基础上，提出了更硬、更重的夹具。编织碳-环氧层合板的压缩拉伸断裂试验证实了这一理论结论。即使在载荷点位移控制下，足够刚性的夹具也允许观察稳定的峰后。动态稳定性分析进一步表明，稳定的postpeak可以观察到CMOD控制下，提供了一个大的质量是刚性连接到当前的软夹具。由实测的具有稳定峰后的完整载荷-挠度曲线下的面积推导出的断裂能与由同一复合材料的尺寸效应试验推导出的断裂能非常吻合。消除了以前对复合材料测试中动态骤回的怀疑。以往认为断裂力学不适用于纤维-聚合物复合材料的观点也是如此。
英文摘要：
Static and dynamic analysis of the fracture tests of fiber composites in hydraulically servo-controlled testing machines currently in use shows that their grips are much too soft and light for observing the postpeak softening. Based on static and dynamic analysis of the test setup, far stiffer and heavier grips are proposed. Tests of compact-tension fracture specimens of woven carbon-epoxy laminates prove this theoretical conclusion. Sufficiently stiff grips allow observation of a stable postpeak, even under load-point displacement control. Dynamic stability analysis further indicates that stable postpeak can be observed under CMOD control provided that a large mass is rigidly attached to the current soft grips. The fracture energy deduced from the area under the measured complete load-deflection curve with stable postpeak agrees closely with the fracture energy deduced from the size effect tests of the same composite. Previous suspicions of dynamic snapback in the testing of composites are dispelled. So is the previous view that fracture mechanics was inapplicable to the fiber-polymer composites.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
