Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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True Stress-True Strain Curves Obtained by Simulating Tensile Tests Using Finite Element Program

인장시험을 유한요소해석 시뮬레이션하여 진응력-진변형도 곡선을 결정하는 방법

  • Chu, Seok-Jae (Dept. of Mechanical and Automotive Engineering, Univ. of Ulsan)
  • 주석재 (울산대학교 기계자동차공학부)
  • Received : 2010.08.02
  • Accepted : 2010.11.06
  • Published : 2011.01.01
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Abstract

In the tensile test necking occurs at the maximum load point and non-uniform stress state is generated in this section. The equivalent stress becomes quite different from the axial stress as necking proceeds. Methods for obtaining the true stress-true strain curves, by overcoming difficulties due to the necking phenomena, have been developed by many authors. One of the methods based on the finite element analysis simulation is a very promising method. In this paper, general-purpose finite element program is used to simulate the tensile test. A round specimen and a flat specimen prepared from the same steel block are tested and simulated. The true stress-true strain curves are determined without assuming that the material follows Hollomon's law.

인장시험할 때 최대하중점을 넘으며 네킹이 발생하여 단면에 분포하는 응력이 더 이상 균일하지 않다. 네킹이 진행될수록 상당응력은 축방향 응력과 더 달라진다. 이 네킹현상을 극복하고 진응력-진변형도 곡선을 결정하는 방법이 이제까지 많이 연구개발되었다. 그 중에서 유한요소해석 시뮬레이션을 이용하는 방법이 매력적이다. 이 논문에서는 범용상용 프로그램을 사용하여 인장시험을 시뮬레이션하였다. 같은 강괴에서 채취한 봉상시편과 판상시편을 인장시험하고 시뮬레이션하였다. Hollomon 법칙을 가정하지 않고 진응력-진변형도 곡선을 결정하였다.

Keywords

Acknowledgement

Supported by : 울산대학교

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