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Quantitative Evaluation and Analysis of Interface Sliding Shear Stress using Stress Transfer at Real Contact Area of Interface in Composite Materials

利用复合材料界面真实接触面积的应力传递定量评估和分析界面滑动剪切应力

基本信息

批准号：
10450248
负责人：
KAGAWA Yutaka
金额：
$ 8.9万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The properties of fiber-reinforced composites are strongly dependent on interface mechanical properties. Thus, understanding of interface mechanical properties becomes an important subject of recent researches. Among the interfacial mechanical properties shear frictional resistance is important. The attention of this study has been focused on a new approach for evaluation of interface shear frictional resistance by introducing a real contact area at a frictional sliding interface. The study involves (1) effect of interface roughness on shear frictional resistance, (2) quantitative analysis of interface shear frictional resistance using a real contact area approach, and (3) application of the real contact area for engineering composite.The effect of interface roughness on shear frictional resistance is examined using model composites. Fibers with a different surface roughness are incorporated into an epoxy matrix and the interface shear frictional resistance is evaluated by push-out and push-back tests. The result shows strong dependence of interface shear frictional resistance on the profile of surface roughness at frictional sliding interface. The real contact area analysis is introduced to evaluate shear frictional stress, and the analysis gives quantitative understanding of shear frictional resistance. The interface shear frictional resistance, τィイD2sィエD2, is expressed as τィイD2sィエD2=(AィイD2rィエD2/AィイD2aィエD2)・τィイD20ィエD2 where AィイD2rィエD2 and AィイD2aィエD2, respectively, are the real contact area and apparent contact area at frictional sliding interface, τィイD20ィエD2 is the intrinsic shear frictional resistance at the real contact area. This approach is applied to the evaluation of interface shear frictional resistance in AlィイD22ィエD2OィイD23ィエD2 fiber-reinforced AlィイD22ィエD2OィイD23ィエD2 matrix composite. The result indicates that the microstructural effect of the composite is successfully evaluated using a rear contact area approach.

纤维增强复合材料的性能在很大程度上取决于界面力学性能。因此，对界面力学性能的理解成为近年来研究的一个重要课题。在界面力学性能中，剪切摩擦阻力是重要的。本研究的注意力集中在一个新的方法来评估界面剪切摩擦阻力通过引入一个真实的接触面积在摩擦滑动界面。研究内容包括：（1）界面粗糙度对剪切摩擦阻力的影响;（2）采用真实的接触面积法定量分析界面剪切摩擦阻力;（3）真实的接触面积在工程复合材料中的应用。使用模型复合材料考察了界面粗糙度对剪切摩擦阻力的影响。具有不同的表面粗糙度的纤维被纳入到环氧树脂基体和界面剪切摩擦阻力进行评估推出和推回测试。结果表明，界面剪切摩擦阻力与摩擦滑动界面处的表面粗糙度分布有很强的相关性。引入真实的接触面积分析法来计算剪切摩擦应力，定量地了解剪切摩擦阻力。界面剪切摩擦阻力τ D2 s D2表示为τ D2 s D2=（A D2 r D2/A D2 a D2）·τ D20 D2，其中A D2 r D2和A D2 a D2分别为摩擦滑动界面处的真实的接触面积和表观接触面积，τ D20 D2为真实的接触面积处的固有剪切摩擦阻力。该方法被应用于铝合金D22铝合金D2 O铝合金D23铝合金D2纤维增强铝合金D22铝合金D2 O铝合金D23铝合金D2基复合材料界面剪切摩擦阻力的评估。结果表明，复合材料的微观结构效应是成功地评估使用后接触面积的方法。