Abstract
A new and effective yield criterion and strain hardening rule for orthotropic materials such as wood are presented. The specific stresses, the ratios of stresses to the corresponding yield stress and called as the non-dimensional stresses in this study, are introduced in the principal axes of anisotropy, and the present yield criteria is expressed as quadratic form of the specific stresses. Also, the strain hardening rule, in which the strain hardening characteristics are established individually for each principle axis of anisotropy, is shown. In order to verify the applicability of the present constitutive law for the wooden material, several numerical experiments are performed and show that the present approach has the promising potentiality to trace and evaluate the wooden specific characteristics qualitatively.
