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首页> 外文期刊>Journal of Materials Engineering and Performance >A numerical model to investigate the role of residual stresses on the mechanical behavior of Al/Al{sub}2O{sub}3 particulate composites
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A numerical model to investigate the role of residual stresses on the mechanical behavior of Al/Al{sub}2O{sub}3 particulate composites

机译：研究残余应力对Al / Al {sub} 2O {sub} 3颗粒复合材料力学行为的影响的数值模型

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摘要

Research is presented about the mechanical behavior of a 6061 aluminum alloy reinforced with alumina particles. In particular, the role of thermal-induced residual stresses on the mechanical behavior of this composite is analyzed. Experimentaltests were carried out to evaluate the mechanical characteristics of this type of material under static and fatigue loading. Fractographies on broken specimens evidenced the failure mechanisms under different load conditions. Also carried out weremeasurements using the x-ray diffractometric (XRD) technique to determine the residual stresses due to the thermal treatment both in the matrix and in the particles. A microscale finite-element model (FEM) of this material was developed to investigate the actual stress state caused by the thermal treatment and an applied load. A comparison of the numerical results and the experimental observations helped to explain the fracture modes under static and cyclic loading and to determine the role of the residual stresses under both monotone and cyclic loads. These results suggest some treatment to improve fatigue strength of the material.
机译：提出了有关6061氧化铝颗粒增强铝合金的力学性能的研究。特别地，分析了热诱导残余应力对这种复合材料的机械性能的作用。进行了实验测试以评估这种材料在静态和疲劳载荷下的机械特性。断裂标本上的分形术证明了在不同载荷条件下的破坏机理。还使用X射线衍射（XRD）技术进行了测量，以确定由于热处理而在基质和颗粒中产生的残余应力。开发了这种材料的微型有限元模型（FEM），以研究由热处理和施加的载荷引起的实际应力状态。数值结果与实验观察结果的比较有助于解释静态和循环载荷下的断裂模式，并确定残余应力在单调和循环载荷下的作用。这些结果表明可以改善材料的疲劳强度。

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