基于能量法的球压痕硬度测量及误差分析  

Energy-based method for spherical indentation hardness measurement and error analysis

作　　者：金宏平[1] 

机构地区：[1]湖北汽车工业学院机械工程学院,湖北十堰442002

出　　处：《兵器材料科学与工程》2016年第3期39-42,共4页Ordnance Material Science and Engineering

基　　金：湖北省自然科学基金资助项目(2014CFB623);湖北汽车工业学院博士基金项目(BK201303)

摘　　要：计算压痕硬度的Oliver-Pharr方法容易受到卸载斜率计算误差的影响。为避免卸载斜率对压痕硬度的影响,假定最大压入深度下的接触半径与残余压痕半径相等,基于压痕功与压痕深度的线性比例关系,根据Hertz弹性接触理论,建立压痕硬度与压痕功的显式数学模型。多段循环加卸载压痕试验结果表明,基于能量法的压痕硬度测量能够提高压痕硬度计算的准确度。Indentation hardness obtained with Oliver-Pharr method is easy to be affected by the calculation error of unloading slope. In order to avoid the influence of unloading slope on the indentation hardness,the contact radius under the maximum depth was assumed to be equal to the residual indentation radius,based on the linear relationship between the indentation energy and the indentation depth,an explicit model was established between indentation hardness and indentation energy using the Hertz elastic contact theory. The results of multiple- cycle indentation experiment show that the calculation accuracy of indentation hardness is effectively improved by using the energy method.

关 键 词：能量法 球压痕 压痕硬度 

分 类 号：TG115.5[金属学及工艺—物理冶金]