碳纤维静、动态加载下拉伸力学性能的试验研究

利用岛津试验机和自行研制的旋转盘式击拉伸试验装置，对Ｔ３００和Ｍ４０Ｊ两种碳纤维实施了应变速率范围为０．００１－１３００ｓ＾－１的静、动态拉伸试验，获得了两种材料在不同应变速率下的完整的应力变曲线。

Static and dynamic tensile behavior of carbon fiber

Tensile mechanical behavior of Carbon fiber bundles have been studied in the strain rate range from 0.001 s -1 to 1 300 s -1 and complete stress strain curves were obtained. Results show the initial elastical modulus, the ultimate strength and failure strain of carbon fiber are strain rate insensitive, and carbon fiber can be regarded as strain rate insensitive material. On basis of the fiber bundle model and the statistic theory of fiber strength, single Weibull distribution model and bimodal Weibull distribution model have been developed to describe mechanical behavior of fiber bundles. And a method for determining the statistic parameters of fibers by tensile tests of fiber bundles is established, too. The simulated stress strain curves from the model are in good agreement with the test data. Simulation results show that the strength of T300 fiber can be described by single Weibull distribution function, and the strength of M40J fiber should be described by bimodal Weibull distribution function.