軟鋼および高力鋼の曲げ第1期クリープ

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  • Transient Creep of Mild Steel and High-Strength Steel under Bending
  • ナンコウ オヨビ コウリョク コウ ノ マゲ ダイ1キ クリープ

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The transient creep characteristics at 400° to 500°C under bending were examined on 0.08%C mild steel and 0.18%C-0.54% Si-1.12% Mn high-strength steel by a cantilever-bending method originally developed by G.T. Harris and his coworkers. The results experimentally obtained are as follows : The stress-distribution of a nonlinear shape over the cross-section of the specimen plastically deformed with constant bending moment is time-dependent during the transient stage of creep, being accompanied by slight decrease in the normal stress at the outermost layer, and then the log-log plots of the strain-rate at the outermost fibre versus the time for respective creep-curve generally show an approximately show an approximately straight-line relations in a way similar to those in conventional tension creep test, except in instances in which the plots deviate obviously from the straight-line evidently depending on the conditions of varying stress.

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