不同壁厚金属圆管撕裂卷曲破坏的实验与理论分析

Experimental Study and Theoretical Analysis on Splitting and Curling Steel Tube with Different Thickness

对放在锥型底座上内径为54.4mm的7组不同壁厚A3无缝圆钢管进行了轴压作用下撕裂卷曲破坏的实验研究和理论分析,实验过程中记录了载荷 位移曲线和试件螺旋状残余变形模态;理论分析中认为耗散能主要由撕裂能,塑性弯曲变形能和摩擦能3部分构成;分析结果表明,圆管壁厚对撕裂能和塑性弯曲变形能在总能耗中所占比例的影响较明显,对摩擦能所占比例的影响甚微。

This paper reported the experimental study and theoretical analyses on axial splitting and curling of A3 steel tubes with different thickness on conical die. Seven groups of metal circular tubes, with diameter D=54.4 mm, were used. The force-compression and deformation modes of specimens were recorded. Three energy dissipation mechanisms are involved: tearing energy, plastic bending energy and friction energy during specimens deformation. Theoretial analysis finds influence of tube-thickness on the ratio of tearing energy and plastic energy to total energy is obviously and on the ratio of frictional energy to total energy is not great.