Transactions of Materials and Heat Treatment

Title：Study on deforming mechanism of circluar tube outside inversion under pressed axially

Authors： Luo Yunhua Huang Zaowen Zhang XianglinHuazhong University of Science and Technology

Unit：

KeyWords： Inverted tube Plastic deforming energy Tube deforming modes Buckles

ClassificationCode：TG301

year,vol(issue):pagenumber：2003,28(5):54-57

Abstract：

When a circular thin tube is pressed axially on the conical die, it experiences transitional deformation modes, such as initial bending, stretching and unbending, and finally reaches steady inverting. But inversion is not the only deforming mode, the other alternative modes like bucking, splitting, flaring and curling sometimes appear. This paper discussed the deforming process of tube end outside from the viewpoint of deforming energy, and presented the deforming mechanics which the circumferential component of deforming energy increment controls the tube end curling, also investigated experiments which agrees with the experimental results well. The conclusion will give us a better understanding on controlling the thin tube inverting deformation.

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Reference：

1　罗云华武装直升机抗坠毁座椅翻转管吸能器的研制华中理工大学硕士论文,1990
2　KKitazawaetalExperimentalstudyofdeformationmechanismintube endcurlingJournaloftheJSTP ,1987,28(323):1267～1274
3　TYReddyetalAxialsplittingofcircularmetaltubesIntJ MechSci1986,28(2):111～131

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