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.
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；
2
The load displacement curve under static load, load displacement hysteric curve under repeated low cycle load and strain data at key points are presented.
给出了静力荷载下的荷载变形曲线、低周反复荷载下的荷载变形滞回曲线以及关键部位的应变数据。
3
The strain of the pipeline increased with an increase of concentrated load. In a constant load, the straincurve of the pipeline was a cycle of sine wave with no significant changes in the cycle.