Fatigue damage and its localization in particulate metal matrix composites
Fatigue damage and its localization in particulate metal matrix composites
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颗粒金属基复合材料中的疲劳损伤及其定位
DOI：
10.1016/0921-5093(96)10250-1
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发表时间：
1996
期刊：
影响因子：
6.4
通讯作者：
F. Ellyin
中科院分区：
文献类型：
--
作者：
L. Chingshen;F. Ellyin
对Al 2 O3颗粒增强6061铝合金复合材料（Al 2 O3/6061 Al）进行了一系列高周和低周疲劳试验。通过光学显微镜和扫描电镜观察，复合材料的疲劳损伤主要表现为颗粒脱粘、颗粒断裂和基体裂纹。细观增强缺陷，如一团大颗粒，造成损伤局部化，这可能会导致短裂纹的萌生和扩展。循环塑性应变幅似乎是一个适当的低周疲劳损伤参数所示的滞后环变化的应变控制的圆柱试样。
A series of high and low cycle fatigue tests have been conducted on Al2O3particulate-reinforced 6061 aluminum alloy composite(Al2O3/6061 Al). Fatigue damage in the composite, as observed by optical and scanning electron microscopes, is primarily in the form of particle debonding, fractured particles and matrix cracks. Mesoscale reinforcement defects, such as a clump of large particles, cause damage localization which may lead to short crack initiation and extension. The cyclic plastic strain amplitude appears to be an appropriate low cycle fatigue damage parameter as indicated by the hysteresis loop variation of strain-controlled cylindrical specimens.