SUS316鋼の高温多軸負荷下におけるラチェット変形挙動

概要

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Biaxial loading tests were carried out by subjecting a thin tube of SUS 316 steel to cyclic torsional straining at 923 K under a constant axial load. The aim of the tests wants to observed and characterize the ratchetting deformation at elevated temperature under multiaxial loading. The results obtained were as follows: (1) The ratchetting strain ε_a was proportional to the constant axial stress σ and the power of the number of cycles N, in such a way as ε_a=C・σ・N^α. (2) The effect of the cyclic torsional strain rate γ^^. on the ratchetting strain ε_a was approximately represented by ε_a=C'・γ^^. ^β. (3) The growth rate of the ratchetting strain slowed down with decreasing strain amplitude, and the shakedown behavior was observed at Δr/√<3>=0.5%. (4) The classical plastic analysis of the ratchetting deformation predicted an overestimation of accumulation of the ratchetting strain. A simplified ratchetting analysis method based on the effective primary stress concept gave good correlation with the experimental results.
社団法人日本材料学会の論文
1988-03-15