激光选区熔化成形半圆孔悬垂结构变形及残余应力研究

Research on deformation and residual stress for overhanging structure of semi-circular hole by selective laser melting

摘要: 基于Simufact additive建立激光选区熔化（selective laser melting，SLM）成形AlSi10Mg合金无支撑半圆孔悬垂结构的仿真模型，分析了不同工序总变形量和残余应力变化情况，研究了几何参数厚度、内/外圆半径对最大总变形量和最大残余应力的影响。结果表明，随着半圆孔厚度增加，最大总变形量和最大残余应力呈增大趋势；半圆孔内圆半径变大，最大总变形量呈增大趋势；半圆孔外圆半径变大，最大总变形量呈减小趋势，但对总变形量影响程度较小。

Abstract: The simulation model of unsupported semi-circular hole overhanging structure of SLM formed AlSi10Mg alloy was established based on Simufact additive. The total distortion and residual stress in different processes were analyzed. The effects of geometric parameter thickness and inner and outer circle radius on the max total distortion and max residual stress were studied. The results show that the max total distortion and the max residual stress increase with the increase of the thickness of the semi-circular hole; the radius of the inner circle of the semi-circular hole becomes larger, and the max total distortion tends to increase; the outer radius of the semi-circular hole becomes larger, and the max total distortion decreases, but it has little effect on the total distortion.