Influence of Residual Stress on Indentation Hardness
Influence of Residual Stress on Indentation Hardness
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发表时间：
2012
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通讯作者：
Wang Qing-ming
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作者：
Wang Qing-ming
对存在残余应力的材料进行了硬度测试。分析了残余应力对材料弹塑性本构关系的影响，并用有限元法计算了材料的硬度。有限元法计算的硬度与硬度试验的实测值吻合较好。因此有限元计算结果是可靠的。在有限元模拟的基础上，研究了残余应力对硬度的影响，建立了描述硬度与残余应力关系的二次多项式拟合表达式。结果表明：硬度受拉应力影响较大，受压应力影响较小；由于弹塑性变形的不同，压痕周围的堆积或下沉取决于载荷大小和压拉残余应力程度，从而影响压痕深度和接触面积，并对硬度测试值产生影响。
The hardness was tested for the materials with residual stress.The elastic-plastic constitutive relation affected by residual stress was analyzed and hardness was calculated by finite element method(FEM).The FEM calculated hardness agrees well with measured hardness from the hardness testing.So the FEM result is reliable.Based on the finite element simulation,the influence of residual stress on hardness was studied to establish the quadratic polynomial fitting expression to describe the relationship between hardness and residual stress.The result shows that hardness is seriously affected by tensile stress,and lightly affected by compression stress.The pile-up or sink-in emerged around indentation depends on both magnitude of load and degree of compression/tensile residual stress because of the different elastic-plastic deformation,which affect the indentation depth and contact area and have an influence on the hardness testing values.