EQUIVALENT STRAIN AND STRESS HISTORY IN TORSION TESTS

被引:8
作者
TEKKAYA, AE
机构
[1] Middle East Technical Univ, Ankara
来源
STEEL RESEARCH | 1994年 / 65卷 / 02期
关键词
D O I
10.1002/srin.199400928
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Bulk and plane torsion tests are being used in industry to determine the flow curve of metals up to very high plastic strains. Despite their wide usage the experimental results obtained in torsion tests are still not being evaluated uniformly. Differences arise basically due to the conversion of the measured angle of twist into the corresponding equivalent strain. This paper shows that the often used equivalent strain expression by Nadai and Davis as well as Eichinger is invalid, since the so-called redundant shear during torsion deformation has been ignored. Also, the histories of different stress measures such as the convected and rotated stress tensors are computed to discuss the reasons for differences between the flow curves obtained from torsion and simple tension tests.
引用
收藏
页码:65 / 70
页数:6
相关论文
共 17 条
[1]  
[Anonymous], 1950, MATH THEORY PLASTICI
[2]  
BAUER M, 1989, ERMITTLUNG FLIESSKUR
[3]   IDEAL FORMING .1. HOMOGENEOUS DEFORMATION WITH MINIMUM PLASTIC WORK [J].
CHUNG, K ;
RICHMOND, O .
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 1992, 34 (07) :575-591
[4]  
EICHINGER A, 1955, HDB WREKSTOFFPRUFUNG, V2, P715
[5]  
George E, 1976, DIETER MECH METALLUR, V2
[6]  
HODIERNE FA, 1963, J I MET, V91, P267
[7]   DETERMINATION OF PLASTICITY LIMIT USING HOT TORSION TEST [J].
KLIBER, J ;
SCHINDLER, I ;
KUBINSKI, W ;
KUZMINSKI, Z .
STEEL RESEARCH, 1989, 60 (11) :503-508
[8]  
Marques J., 1984, ENG COMPUT, V1, P42, DOI [10.1108/eb023559, DOI 10.1108/EB023559]
[9]  
Nadai A, 1950, THEORY FLOW FRACTURE, V1
[10]  
NADAI A, 1937, J APPL PHYS, V8, P213