Indexed by:会议论文
Date of Publication:2012-11-01
Page Number:26-26
Abstract:纤维增强复合材料的力学行为取决于纤维、基体及其界面的结构与性质,适当的界面结合能有效地传递应力,让高性能纤维以脱粘、搭桥、段断和拉出等方式来阻滞基体裂纹的传播,消耗更多的断裂能量,从而提高复合材料整体增韧效果.一般而言,裂纹尖端存在强烈的应力奇异性,处在裂纹前喙高应力集中会通过纤维/基体界面传递给完整粘接的纤维.当裂纹进一步扩展穿越纤维发生裂纹与纤维交互,一般会出现两种情况,一是出现部分脱粘的搭桥纤维,裂纹沿着纤维基体界面传播且无纤维断裂;二是无脱粘发生,当载荷超过纤维拉伸强度后发生纤维断裂.很明显,同时出现上述两种现象是有可能的,当界面裂纹传播足够远时,在纤维/基体界面脱粘之后紧接着就是裂纹桥接纤维的最终断裂,这仍需要进一步的实验来观察.使用微拉曼光谱技术来研究完整粘接纤维、搭桥纤维和断裂纤维与基体裂纹之间的交互作用,通过逐点测量纤维上的应力/应变分布,建立裂尖前喙完整粘接纤维、搭桥纤维和断裂纤维的应力传递模型,为解释纤维复合材料增韧现象提供可靠的界面微力学实验数据.
Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
Gender:Male
Alma Mater:Dalian University of Technology (DUT)
Degree:Doctoral Degree
School/Department:State Key Laboratory of Industrial Equipment for Structral Analysis, Department of Engineering Mechanics
Discipline:Solid Mechanics. Applied and Experimental Mechanics. Engineering Mechanics. Mechanical Manufacture and Automation. Vehicle Engineering. Aerospace Mechanics and Engineering. mechanics of manufacturing process
Business Address:Room 321, Department of Engineering Mechanics
Contact Information:Tel.: 86 0411-84708406 Email: leizk@dlut.edu.cn
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