基于组织特征的挤压铸造A356合金局部力学性能研究OACSTPCD

The local mechanical properties of A3 56 squeezing castings were studied by finite element analysis(FEA)with microstructure-based models.By analyzing different analysis domain sizes,mesh sizes and FEA models,the FEA models for each position were determined.Subsequently,the accuracy of the calculation results was validated by experimental results.Furthermore,the effect of microstructural characteristics on mechanical properties was explored,indicating that with an increase in Si particle length and shape factor,both the ultimate tensile strength and elongation exhibited a decreasing trend.Conversely,higher Si particle density and area fraction resulted in increasing ultimate tensile strength but decreasing elongation.The damage evolution process of the A356 alloy consisted of three stages:particle cracking(microcrack formation),crack propagation and connection.When the Si particles were small and uniformly distributed,the local mechanical properties exhibited low anisotropy.Conversely,when the Si particles had a larger aspect ratio and exhibited pronounced orientation,increased anisotropy was observed.