拉压下不锈钢三阶段应力-应变关系的逆表达式

提出了不锈钢合金应力-应变关系的新表达式,应力为应变的显式函数。基于改进的Ram-berg-Osgood方程,本公式是现有三阶段应力-应变关系的一种近似逆表达。三阶段关系公式比两阶段关系公式更准确,并对拉应力和压应力均适用。基于理想线弹性性能和实际应力-应变曲线误差的合理假定,提出本表达式,其在应力的全范围阶段都是有效的。选取不同的材料参数,对本表达式进行试验验证。结果表明:新公式结果与全范围应力-应变关系的迭代数值求解结果很吻合,最大误差低于4%。

Inversion of Three-Stage Stress-Strain Relation for Stainless Steel in Tension and Compression

Presented in this paper is a new stress-strain relation for stainless steel alloys that provides the stress as an explicit function of the strain.The relation is an approximate inversion of a recently proposed three-stage stress-strain relation based on a modified Ramberg-Osgood equation.The three-stage relation is a much more accurate formulation than the previous two-stage formulations and is applicable to both tensile as well as compressive stresses.The new relation is derived by making a rational functi...