Effects of particulate volume fraction on cyclic stress response and fatigue life of AZ91D magnesium alloy metal matrix composites
Effects of particulate volume fraction on cyclic stress response and fatigue life of AZ91D magnesium alloy metal matrix composites
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DOI：
10.1016/j.msea.2014.02.021
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发表时间：
2014-04-10
期刊：
影响因子：
6.4
通讯作者：
Lewandowski, John J.
中科院分区：
文献类型：
--
作者：
Hassan, Hala A.;Lewandowski, John J.
在完全反向应变控制加载条件下，对挤压铸造后热挤压制备的AZ91D单片和AZ91D/SiCp复合材料进行了测试。考察了SiCp体积分数（即V-f=0%、5%、15%、25%和30%）和施加的应变幅值对应变控制疲劳寿命和性能的影响。随着SiCp含量的增加，低循环状态下的应变控制疲劳性能会降低，而高循环状态下则有潜在的好处。弹性应变幅值、塑性应变幅值与破坏逆转的关系分别由Basquin方程和Coffin-Manson方程描述。单调应力-应变曲线与循环应力-应变曲线的对比表明，加筋量和外加应变幅值对迟滞回线演化特性有显著影响。(c) 2014 Elsevier B.V.版权所有
In this work, both AZ91D monolithic and AZ91D/SiCp composites prepared by squeeze casting followed by hot extrusion are tested under fully reversed strain-controlled loading conditions. The effects of SiCp volume fraction (i.e. V-f=0%, 5%, 15%, 25%, and 30%) and the imposed strain amplitude on the straincontrolled fatigue life and properties are examined. Increasing the SiCp, content degrades the straincontrolled fatigue properties in the low cycle regime, with a potential benefit in the high cycle regime. The relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure are well described by the Basquin and Coffin-Manson equations, respectively. A comparison made between the monotonic and cyclic stress-strain curves reveals that the reinforcement amount as well as the imposed strain amplitude significantly affects the characteristics of the evolving hysteresis loops. (c) 2014 Elsevier B.V. All rights reserved.