【作者】 周元鑫； 江大志； 夏源明；

【Author】 Yuanxin Zhou, Dazhi Jiang Yuanming Xia (Dept. of Modern Mechanics, Univ. of Sci. and Tech. of China, Hefei, Anhui, 230027 )

【机构】 中国科学技术大学近代力学系；

【摘要】 本文利用岛津试验机和自行研制的旋转盘式冲击拉伸试验装置,对T300和M40J两种碳纤维实施了应变率范围为0.001 l/s—1300 l/s的静、动态拉伸试验,获得了两种材料在不同应变率下的完整的应力应变曲线。试验结果表明,T300纤维束和M40纤维束的弹性模量、拉伸强度以及失稳应变在上述应变率范围内均未发生明显变化,可以认为是一种应变率无关的材料。根据纤维束模型和纤维强度的统计理论,结合两种纤维束的在不同应变率下的试验结果,本文建立了纤维束的统计本构模型,模型分析表明,T300纤维强度满足两参数的单Weibllu分布,而M40J纤维强度则需用双Weibull分布才能更好地描述。更多还原

【Abstract】 Tensile mechanical behavior of T300 fiber bundles and M40J fiber bundles have been studied in the strain rate range from 0.001 1/s to 1300 1/s and complete stress strain curves were obtained. Results show that both ultimate strength and failure strain of two materials are strain rate insensitive, and T300 fiber and M40J 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 determine 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. Simulated 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.更多还原