In the same material, dimension and load circumstance, the cut stress of the triangle thread is smallest. Its rupture load is higher than the echelon and rectangle.
在螺纹材料、尺寸、载荷都相同的情况下，三角形螺纹牙所受的剪应力最小，断裂载荷也比梯形螺纹和矩形螺纹高。
The methods of creep test to get both curves of tensile creep rupture load vs time and creep strain vs time are compared. The procedures to extrapolate the two types of creep curves are presented.
比较了获得拉伸蠕变破坏荷载-时间曲线以及蠕变应变-时间曲线的试验方法，给出了外推这两种蠕变曲线数据的处理步骤。
The methods of creep test to get both curves of tensile creep rupture load vs time and creep strain vs time are compared. The procedures to extrapolate the two types of creep curves are presented.
比较了获得拉伸蠕变破坏荷载-时间曲线以及蠕变应变-时间曲线的试验方法，给出了外推这两种蠕变曲线数据的处理步骤。
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