Reinforing Mechanism of Fiber-Reinforced Metals Considering Interfacial Stress Transfer

考虑界面应力传递的纤维增强金属的增强机制

基本信息

批准号：
04452277
负责人：
KAGAWA Yutaka
金额：
$ 4.67万
依托单位：
Institute of Industrial Science, The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452277/
关键词：
Fiber-reinforced metals Pushout test Interface mechanical properties Tensile strength High temperature strength Interface energy release rate Rule of mixtures Interface shear sliding stress SiC繊維強化Ti 理論強度界面剥離エネルギー開放率プッシュアウト界面せん断

项目摘要

The effects of interfacial shear mechanical properties on the tensile strength of SiC (SCS-6) fiber-reinforced Ti-15-3 alloy matrix composites have been examined. The interfacial shear mechanical properties were measured by thin specimen pushout technique which developed within this study. The interfacial shear debonding energy release rate was about 10 J/m^2 and shear sliding stress was 70-120 MPa.The origin of interfacial shear sliding stress was also obtained using the pushout test results and FEA.The result showed that the interfacial shear frictional sliding originated from (i) roughness at sliding interface, (ii) thermally induced clamping stress, and (iii) Poison's constrain effects. The interface roughness depends on the rteaction products and path of the debonding crack. Quantitative understanding of the origin of shear frictional stress was also carried out.The tensile strength of the composite was obtained theoretically using the properties of fiber, matrix, and interface. The theoretical prediction of the tensile strength agreed well with the experimental results. The obtained theoretical prediction was re-arranged as a from of "rule of mixture" to obtain tensile strength of various types of fiber-reinforced metals. The rule of mixture clearly demonstrated effects of interfacial shear mechanical properties and existence of optimum interfacial shear mechanical properties to obtain a maximum strength of fiber-reinforced metal matrix composites.

研究了界面剪切力学性能对 SiC (SCS-6) 纤维增强 Ti-15-3 合金基复合材料拉伸强度的影响。界面剪切机械性能通过本研究中开发的薄样品推出技术来测量。界面剪切脱粘能量释放速率约为10 J/m^2，剪切滑动应力为70-120 MPa。利用推出试验结果和有限元分析，还获得了界面剪切滑动应力的来源。结果表明，界面剪切摩擦滑动源自 (i) 滑动界面的粗糙度，(ii) 热致夹紧应力，以及 (iii) Poison 的约束效应。界面粗糙度取决于反应产物和脱粘裂纹的路径。还对剪切摩擦应力的起源进行了定量理解。利用纤维、基体和界面的性质从理论上获得了复合材料的拉伸强度。拉伸强度的理论预测与实验结果吻合良好。将获得的理论预测重新排列为“混合物规则”，以获得各种类型的纤维增强金属的拉伸强度。混合规则清楚地证明了界面剪切力学性能的影响以及最佳界面剪切力学性能的存在，以获得纤维增强金属基复合材料的最大强度。