折れ線ひずみ経路に沿うひずみ速度急変後の応力の定式化(S11-1 材料・構造の衝撃工学(1),S11 材料・構造の衝撃工学)

概要

論文の詳細を見る
Some kinds of steels such as austenite steels, extremely low-strength steels and so on may show the remarkable cross hardening effect when strain paths are abruptly bent. In such cases, the remarkable increase in flow stress just after the abrupt change in the strain path is observed, and this increase in the flow stress is enhanced by a high 'subsequent' strain rates. In order to describe such a cross hardening effect, constitutive equations based on the anisotropic yield function with Hill's anisotropic coefficient tensor are formulated, and then they are associated with Phillips-Wu's overstress model with an practical rate-sensitive stress-strain description where the abrupt change in strain rate is also taken into account. Simulated stress-strain curves based on the proposed constitutive equations are compared with the experimentally observed curves of low yield strength steel 'LYP-100', and the validity and the applicability of the proposed constitutive equations are discussed.
社団法人日本機械学会の論文
2004-09-04