Transactions of Materials and Heat Treatment

Title：Symmetry compression based on plastic instability of circular tubes

Authors： Yu Haiyan He Zezhen

Unit： Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji University

KeyWords： circular metal tubes free compression plastic instability wrinkle tube-tube join

ClassificationCode：TH131

year,vol(issue):pagenumber：2016,41(9):58-63

Abstract：

A new technology of joining two tubes was developed based on plastic instability. In order to

obtain parameters of this join method, the unstable wrinkles produced by compressing circular

tubes were investigated, and their experiments and finite element simulation were conducted.

By means of uniaxial tension and free compression tests, focusing on finite element simulation

of tube free compression and constraints compression processes, the influences of the

slenderness ratio of tubes on the number and formation of wrinkles formed by compression

instability and the relationship bewteen wrinkle and pressure were further discussed. It is

shown that the slenderness ratio (l/r0) has an obvious effect on the formation and wrinkle

numbers. When l/r0 is from 0 to 0.375, the compression wrinkles cannot be formed. When l/r0 is

from 0.438 to 1.5, one wrinkle is formed. If l/r0 is from 1.56 to 2.43, two wrinkles are

formed. If l/r0 is larger than 2.5, three or more wrinkls will be formed.

Funds：

国家自然科学基金资助项目 (51175382)

余海燕 (1976-)，女，博士，教授，博士生导师

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