The impact of defect morphology, defect size, and SDAS on the HCF response of A356-T6 alloy
The impact of defect morphology, defect size, and SDAS on the HCF response of A356-T6 alloy
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DOI：
10.1007/s00170-017-0192-6
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发表时间：
2017-09-01
影响因子：
3.4
通讯作者：
Fathallah, R.
中科院分区：
文献类型：
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作者：
Ben Ahmed, A.;Nasr, A.;Fathallah, R.
研究了缺陷形貌、缺陷尺寸和SDAS对A356-T6铝合金疲劳性能的影响。对含有不同孔隙形态的试样进行了三维有限元分析-（i）球形孔隙，（ii）椭圆形孔隙，和（iii）复杂孔隙。嵌入Abaqus的Chaboche运动硬化模型用于表征循环加载过程中的材料响应。采用缺陷应力梯度（DSG）方法模拟了A356-T6缺陷的北川图。一个很好的协议之间的实验和数值计算结果预测疲劳极限的情况下，球形缺陷。缺陷形态对抗疲劳性的影响被清楚地证明。本文表明，铝的疲劳抗力是强烈依赖于缺陷的大小，SDAS，和缺陷的形态。因此，考虑到这三个参数的影响，建立了一个数学模型，采用响应面（RS）的方法来预测多孔铝合金的疲劳极限。此外，缺陷的形态，缺陷的大小，和SDAS的疲劳响应和充分保留拉伸载荷下的相互作用的影响进行了研究。
This paper aims to investigate the influence of defect morphology, defect size, and SDAS on the fatigue behavior of A356-T6 aluminum alloy. A 3D finite element analysis for specimens containing different pore morphologies-(i) spherical pore, (ii) elliptical pore, and (iii) complex pore-was implemented. The Chaboche kinematic hardening model embedded in Abaqus is used to characterize the material response during cyclic loading. Kitagawa diagrams for defective A356-T6 are simulated using the defect stress gradient (DSG) approach. A good agreement is found between experimental and numerical results for predicting fatigue limit in the case of spherical defects. The impact of defect morphology on the fatigue resistance is clearly demonstrated. This paper shows that aluminum fatigue resistance is strongly dependent on the defect size, SDAS, and the defect morphology. Therefore, a mathematical model that takes into account the impact of these three parameters is developed using response surface (RS) approach to predict fatigue limit of porous aluminum alloy. Moreover, the effects of defect morphology, defect size, and SDAS on fatigue response and their interactions under fully reserved tensile loading are investigated.