【摘要】 采用量纲分析法,建立了直径1 mm球形压头的无量纲函数.通过此无量纲函数和有限元计算,可推算金属材料的屈服强度和应变硬化指数.通过模拟,得到了屈服应变从0.00769到0.04范围的材料常数的拟合函数,并利用此拟合函数得到了屈服强度和应变硬化指数.通过模拟验证,此方法提高了计算精度并扩大了材料的计算范围.所获得的屈服强度平均误差是1.6%,应变硬化指数的平均误差12.6%.更多还原

【Abstract】 Dimensional analysis was constructed to derive the dimensionless functions of a spherical indenter with 1 mm in diameter.The function can be used to extract the yield strength and strain hardening exponent of metal materials by means of finite element analysis.The fitting functions used to analyze materials yield strength and strain hardening exponent within the yield strains ranging from 0.00769 to 0.04 were obtained by numerical simulation.It has been validated that the prediction accuracy is enhanced and the average errors of the yield strength and strain hardening exponent are 1.6%and 12.6%,respectively.更多还原