这种骨折通常是轴向压缩应力与旋转或剪式应力综合作用的结果。
This fracture usually results from the joint effects of axial compression, and rotating or shearing stress.
分别比较了轴向压缩胀形和复合胀形中管件支管顶部双向拉应力、应变以及支管高度等指标的变化。
The variation of two-way tensile stress, strain distribution and branch height in the axial compressive bulging and compound bulging were compared respectively.
结果表明：随着初始主应力方向角的增大，轴向残余变形由压缩状态的正值逐渐过渡到伸长状态的负值。
The results show that: with the initial principal stress direction angle increases, the axial residual deformation from the compression state gradually transits to the elongation.
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