A tension-torsion machine for testing yield criteria and stress-strain relationships at <math><mtext>T = 78°</mtext><mtext>K</mtext></math>期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A tension-torsion machine for testing yield criteria and stress-strain relationships at $T = 78° K$

Authors:	G.H. Daneshi J.B. Hawkyard

Affiliation:	Department of Mechanical Engineering, University of Manchester Institute of Science and Technology, P.O. Box 88, Manchester M60 10D, England

Abstract:	A tension-torsion machine in which aluminium and copper specimens are pulled and twisted while being immersed in liquid nitrogen is described. The incorporated load cell and extensometer offer very accurate readings at $T = 78° K$ .The test materials are especially treated to approach conditions of isotropy and homogeneity. Stress-strain curves in simple tension and pure shear are obtained at $T = 292° K$ and $T = 78° K$ . It can be seen that at 78°K the initial yield surface obeys the von Mises yield criterion.

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