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On the Derivation of Material Constants Associated with Dynamic Behavior of Heat Formed Plates

열성형 판 부재의 동적거동에 관련된 재료상수 산출에 관한 연구

Lee, Joo-Sung;Lim, Hyung-Kyun
이주성;임형균

  • Received : 2015.09.14
  • Accepted : 2016.03.21
  • Published : 2016.04.29

Abstract

When impact load is applied to a plate structure, a common phenomenon that occurs in structures is plastic deformation accompanied by a large strain and eventually it will experience a fracture accordingly. In this study, for the rational design against accidental limit state, the plastic material constants of steel plate which is formed by line heating and by cold bending procedure have been defined through the numerical simulation for the high speed tension test. The usefulness of the material constants included in Cowper-Symonds model and Johnson-Cook model with the assumption that strain rate can be neglected when strain rate is less than the intermediate speed is verified through comparing the present numerical results with those in references. This paper ends with describing the future study.

Keywords

cold forming;dynamic hardening factor;fracture;heat forming;line heating;material constant;plastic hardening;strain rate

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Acknowledgement

Supported by : 한국연구재단