Zhu Gui He and Ryuta Onodera
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581
In this paper we showed that stress-strain curves of strain-aged specimen of low carbon steel can be predicted by computer simulation based on the constitutive equations which have been proposed in order to explain the yield point phenomena. In the theory two internal stresses are supposed: the one, Yint is the stress which is work-hardened, and the other, Yir the stress work-softened and age-hardened. It was supposed that strain aging influences two internal stresses in following way: the work-hardening rate of Yint and the value of Yir are both increased with increase in aging time. This supposition was formulated as functions of aging temperature and aging time. The simulated stress-strain curves showed a good agreement with the experimental ones, which means that the constitutive equations used in the simulation are reliable.
(Received October 28, 2002)
computer simulation, stress-strain curve, strain aging, aging temperature, aging time, low carbon steel, yield point phenomena, work hardening rate
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