On the mechanisms of ductility-decreasing of compressively prestrained steel

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  • 圧縮予歪を受けた鋼材における延性低下の機構に関する一考察
  • アッシュク ヨヒズミ オ ウケタ コウザイ ニ オケル エンセイ テイカ ノ キコウ ニ カンスル イチ コウサツ

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It is well known that the critical equivalent plastic strain for ductile fracture initiation is strongly influenced by the stress triaxiality and decreased exponentially as the stress triaxiality increases. Authors have found that the critical equivalent plastic strain of compressively prestrained steel for ductile fracture initiation decreases from that of no-prestrained steel as the compressive prestrain increases. In this investigation, the ductile fracture surfaces of compressively prestrained steel were examined by SEM observation. It is found that the micro-cleavage cracks appear in the ductile fracture surface and enhance the ductile fracture initiation of compressively prestrained steel.

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