在应变疲劳曲线上，弹性线和塑性线的交点随弹簧钢回火后硬度的升高而向低循环寿命移动；
The point of intersection of elastic line and plastic line moves toward the low cycle life with the hardness of the spring steel raised after tempering from the strain fatigue curve.
研究结果表明，弹塑性有限元分析法预测的寿命偏低，由残余应力可以较准确地确定最大应力应变循环。
The result shows that predicting life by elasticity-plasticity finite element analysis is low and the maximal stress-strain cycle can be calculated accurately by the residual stress method.
喷丸过程和随后的接触疲劳滚压过程同属在赫兹应力作用下的循环弹塑性应变过程。
Both shot peening and contact rolling belong to the cyclic elastic-plastic deformation process under the action of Hertz stress.
实验项目有等应变率拉伸、等应力蠕变和控制应变幅的等应变率塑性循环。
The experimental items of the tests are tension of constant strain rate, creep at constant stress, and strain controlled low cycle fatigue of constant strain rate.
采用金属材料微元屈服极限随机分布模型，计算出每次循环产生的微观塑性应变，并与用单调拉伸试验确定的材料真实断裂延性联系起来。
Randomly distributed models of micro-plastic strains were used to calculate the micro-plastic deformation produced at each cycle of the steel under high cycle fatigue test.
阐述了观察到的两种7000系列合金在小塑性应变幅下循环软化，而在大塑性应变幅下循环硬化的现象。
The observed phenomenon that both 7000 series alloys tested soften cyclically at smaller plastic strain amplitude and harden at larger plastic strain amplitude is explained.
合金的塑性应变能密度受应变幅的影响且具有循环相关性；
The values of plastic strain energy density are affected by the plastic strain amplitude and change with the cycle numbers.
基于内时塑性本构方程对循环松弛应力-应变曲线进行了数值模拟，取得了与实验相吻合的结果。
The calculation results showed that the constitutive relationship has accepted for the cyclic stress relaxation under strain-controlled tests.
岩石的不可逆塑性变形随动应变增加而增大，同时由循环荷载引起的损伤变形也逐渐增加。
Moreover, the irreversible plastic deformation of rock increased, and at the same time, the fracture deformation of rock gradually increased, which was produced by cyclic load.
岩石的不可逆塑性变形随动应变增加而增大，同时由循环荷载引起的损伤变形也逐渐增加。
Moreover, the irreversible plastic deformation of rock increased, and at the same time, the fracture deformation of rock gradually increased, which was produced by cyclic load.
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