Extended formulation of isotropic hardening strongstagnationstrong.pdfVIP

Journal of Applied Mechanics Vol.11, pp.263-270 (August 2008) JSCE Extended formulation of isotropic hardening stagnation behavior in cyclic loading of metals by the subloading surface model Koichi Hashiguchi* and Toshiyuki Ozaki** * Member Dr. of Eng. and Dr. of Agr., Prof, Dept. Civil and Environ. Eng., College of Technology, Daiichi University, (Kokubu-Chuo 1-10-2, Kirishima-shi, Kagoshima-ken 899-4395, Japan) **Member Dr . of Agr., Manager of Transmission Line Engineering Dept. Kyushu Electric Engineering Consultants Inc. (Kyuken-Bld.7F, Kiyokawa 2-13-6,Chuo-ku, Fukuoka, 810-0005, Japan) The stagnation phenomenon of isotropic hardening is observed in the cyclic loading be- havior of metals. An extended formulation of this phenomenon is formulated so as to de- scribe the smooth evolution of isotropic hardening by incorporating the concept of the subloading surface, which falls within the framewodc of stress space formulation. In addi- tion it is furnished with the controlling function of the isotropic hardening stagnation vari- able and thus it does not require any return-mapping algorithm. Key Words: constitutive equation, elastoplasticity,, metals, isotropic hardening