Cyclic Stress-Strain Behaviors of Carbon Steel and Cr-Mo Steel

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  • 炭素鋼およびクロム・モリブデン鋼の繰返し応力‐ひずみ挙動
  • タンソ コウ オヨビ クロム モリブデン コウ ノ クリカエシ オウリョク ヒ

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Abstract

Cyclic stress-strain curves were obtained by the incremental step method for a carbon steel SB 49 and a chromium-molybdenum steel SCMV 4. The temperature and strain rate dependences of the cyclic stress-strain curves were discussed and the curves were compared with those obtained by the companion specimens method. The conclusions obtained were as follows:<br>(1) Cyclic hardening and cyclic softening behaviors were observed for SB 49 and SCMV 4, respectively. The cyclic stress-strain curve lay at the higher stress level side than the monotonic stress-strain curve for SB49; for SCMV 4 it was the other way.<br>(2) The cyclic stress-strain curve depended on strain rate. With decreasing strain rate, the stress amplitude for SB49 increased at 200 and 300°C, but decreased at 400 and 500°C. Similar dependences were observed in SCMV 4 steel.<br>(3) The cyclic stress-strain curve can be expressed very well by the experimental equation as Δεt/2=(Δσ/2)/E'+{(Δσ/2)/K'}1/n'<br>(4) For both materials, the cyclic stress-strain curve obtained by the incremental step method coincided with that obtained by the companion specimens method.<br>(5) The cumulative damage against the number of blocks to failure in the incremental step tests ranged from 2 to 1/2 for both materials.

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