Mechanical properties of In‐Situ Composites
Mechanical properties of In‐Situ Composites
复制标题
原位复合材料的机械性能
DOI：
10.1002/mawe.19850160409
复制
发表时间：
1985
影响因子：
1.1
通讯作者：
M. Taha
中科院分区：
文献类型：
--
作者：
M. Latif;N. Mahallawy;M. Taha
本文综述了作者多年来对原位定向固化复合材料力学性能的研究成果。所研究的合金体系为纤维状Al-Ni、Fe-MnS和钴基高温合金Co-Cr-C以及层状Al-Cu和Co-W。研究了上述体系在静、动载荷作用下的力学性能。静态加载涉及拉伸、压缩和三点弯曲，动加载涉及旋转弯曲疲劳、疲劳裂纹扩展和应变控制疲劳。
In this paper, author's results of several years of research work on the mechanical properties of directionally solidified (In-Situ) composites are reviewed. Alloy systems investigated were the fibrous Al-Ni, Fe-MnS and the cobalt base superalloy Co-Cr-C and the lamellar Al-Cu and Co-W. The mechanical behavior of the above systems were studied under both static and dynamic loadings. Static loading involved tension, compression and 3-point bending and the dynamic loading involved rotating bending fatigue, fatigue crack propagation and strain controlled fatigue.
It was found that the tensile fracture stress and toughness and the ultimate compressive stress were generally enhanced by increasing growth rate and/or temperature gradient. However, at very high growth rates, the properties were found to decrease due to misalignment of the structure. Models were suggested to describe the static behavior of the composites investigated. Good agreement was found between the model predictions and the experimented results which indicate that the static properties are structural sensitive. On the contrary, the fatigue life of the Al-Al3 Ni was insensitive to structural changes caused by varying the growth rate. The fatigue crack propagation response of the Co-Cr-C composites was found to follow the Paris Erdogan relation. Examination of the fracture surface confirmed a brittle mode of fracture with fiber cleavage and matrix shearing to link up fiber breaks.