炭素鋼の変動組合せ応力下のメカニカルラチェット変形挙動 : 第1報, 繰返しひずみ幅が変動する場合

概要

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To find the effect of variation in strain amplitude on the strain accumulation characteristics in the mechanical ratcheting of a carbon steel, a thin-walled tubular specimen was subjected to strain-controlled cyclic axial load and internal pressure. When the cyclic load with a constant strain amplitude Δε^^-_1 was superposed upon the internal pressure, the strain ε^^-_2 accumulated in the circumferential direction was formulated by the following equation as a function of the steady circumferential stress σ^^-_2 and number of cycles N. ε^^-_2=Cσ^^-_2Δε^^-_1N^α, C, α ; material constants. The ratcheting behaviors were examined also when the strain amplitude was varied stepwisely or gradually with increasing number of cycles. For the description of ratcheting strain accumulation in this case, a modified strain hardening rule was proposed.
一般社団法人日本機械学会の論文
1985-02-25