A New Method for Estimating Nonproportional Notch-Root Stresses and Strains
A New Method for Estimating Nonproportional Notch-Root Stresses and Strains
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DOI：
10.1115/1.2805971
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发表时间：
1997
影响因子：
1.2
通讯作者：
R. Gu;Y. Lee
中科院分区：
文献类型：
--
作者：
R. Gu;Y. Lee
本文提出了一种广义的两步内时方法，用于估计缺口应力和应变的弹性应力解的基础上。在第一个应力控制步骤中，缺口根部应变使用传统的单轴方法，如Glinka的能量密度法和Neuber的规则，从弹性应力计算。在第二个应变控制步骤中，根据给定的材料特性计算与估计的局部应变相对应的缺口根部应力。本文提出了基于内时塑性理论的应力控制和应变控制算法。该方法用于计算单调和非比例载荷下的多轴应变。各种几何约束（平面应力，平面应变，和中间水平）也进行了检查。将结果与其他研究人员的实验测量结果以及其他模型的预测结果进行了比较。
This paper presents a generalized two-step endochronic approach for estimating notch stresses and strains based on elastic stress solutions. In the first stress-controlled step, notch root strains are calculated from elastic stresses using a conventional uniaxial method, such as Glinka`s energy density method and Neuber`s rule. In the second strain-controlled step notch root stresses corresponding to the estimated local strains are calculated from the given material properties. Both stress-controlled and strain-controlled algorithms based on endochronic plasticity theory are presented herein. The proposed method is used to calculate multiaxial strains under monotonic and nonproportional loads. Various geometric constraints (plane stress, plane strain, and intermediate level) are also examined. The results are compared with experimental measurements by other researchers and with predictions from other models.