铝硅合金轧制中增强体颗粒应力集中数值模拟  

Numerical Simulation of Reinforced Particle Stress Concentration in Al-Si Alloy Rolling

作　　者：赵彦玲[1] 周凯[1] 车万博[1] 铉佳平[1] 车春雨[1] 

机构地区：[1]哈尔滨理工大学机械动力工程学院,哈尔滨150080

出　　处：《材料工程》2013年第3期51-54,60,共5页Journal of Materials Engineering

基　　金：黑龙江省自然基金(E201028);哈尔滨市科技创新人才研究专项基金(2011RFJGG010);哈尔滨理工大学2011年研究生创新科研基金(HLGYCX2011-013)

摘　　要：针对铝硅合金轧制过程中,硅晶粒相对铝基体变形抗力大产生应力集中的问题。利用有限元方法,建立了针对轧制过程中增强体颗粒的有限元模型,研究了硅晶粒及铝基体应力、应变云图及曲线。解决了普通实验无法定量分析轧制过程中增强体颗粒受力的问题。结果表明:临近晶粒处铝基体应变值大于其他部位铝基体且远大于硅晶粒处应变,说明在晶粒处有金属堆积现象;晶粒处应力值大于铝基体,说明由于晶粒附近的金属堆积,导致应力集中现象的产生。模拟结束后,通过扫描电镜观察拉伸试样断口形貌及能谱分析间接验证数值模拟方法的可行性和模拟结果的正确性。In the rolling process of aluminum-silicon alloy, there was a problem of silicon grains stressconcentration which results from the deformation resistance of silicon grain was bigger than aluminum matrix. Aiming at this problem, the finite element model of reinforcement particles is established in rolling and the stress and strain contours and curves of silicon grains and aluminum body are re- searched by the finite element procedures. The problem that the stress of reinforcement particles inrolling process can not be analyzed quantitatively by ordinary experiment is also solved. The results show that the strain of the aluminum matrix near the grains is greater than other parts of the A1 ma- trix and far greater than the strain of silicon grain, which indicates the metal accumulation phenome- non appeared on the grains. The stress value of silicon grain is greater than aluminum matrix, which indicates stress concentration phenomenon appeared because of the accumulation of the metal near the grains. After the simulation, the feasibility of numerical simulation method and the accuracy of simu- lation results can be validated indirectly by the method of observing the feature of tensile fracture with the electron microscopy and analyze the energy spectrum.

关 键 词：铝硅合金 增强体颗粒 金属堆积 应力集中 数值模拟 

分 类 号：TB331[一般工业技术—材料科学与工程]