Effect of prestrain and strain rate on viscoplastic properties and on strain ageing of metals: Experimental and theoretical investigation on viscoplastic properties including stress relaxation of steel

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:191366

Kaneko, Kenji ^[1]; Oyamada, Takanobu ^[2]

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1. Science Univ. of Tokyo, Shinjuku, Tokyo (Japan). Dept. of Mechanical Engineering
2. Tottori Univ. (Japan). Dept. of Mechanical Engineering

Although many studies on viscoplasticity of metals have been reported, these do not necessarily succeed in unitive interpretation of viscoplastic behavior, for example, strain rate inverse-dependency of plastic flow stress and ununitive properties in both flow stress and stress relaxation. In this study, the authors have succeeded to interpret unitively viscoplastic behavior of metals including both creep and stress relaxation behavior by investigating strain aging properties under plastic flow of metals quantitatively. In the previous report, an experimental method is successfully presented to get both a viscosity dependency and a strain ageing dependency of viscoplastic flow stress of metals separately. In this report, both an increasing strain ageing during stress relaxation in which strain rate decreases gradually, and temporal over-hardening in reloading are estimated quantitatively. It is shown that the proposed viscoplastic constitutive model including strain ageing effect has a good applicability to an inelastic behavior having a stress-relaxation.

• OSTI ID: 191366
• Report Number(s): CONF-950740--; ISBN 0-7918-1337-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPARATIVE EVALUATIONS
DEFORMATION
EXPERIMENTAL DATA
FLOW STRESS
MATHEMATICAL MODELS
METALS
PLASTICITY
STRAIN AGING
STRAIN HARDENING
STRESS RELAXATION
THEORETICAL DATA