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논문 기본 정보

자료유형
학술대회자료
저자정보
Quoc-Tuan Pham (Kyungpook National University) Seok-Chul Shin (Kyungpook National University) Young-Suk Kim (Kyungpook National University)
저널정보
한국소성·가공학회 금형가공 심포지엄 2015년도 제12회 금형가공 심포지엄
발행연도
2015.8
수록면
132 - 139 (8page)

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초록· 키워드

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From an overview of mechanical engineering, it is accepted that the plasticity of metals is a strongly nonlinear problem in which many nonlinear curves are required to describe important characteristics of plasticity such as flow curve, yield locus and ductile fracture. Much effort has been made to capture these characteristics by introducing many parameters to precisely express the experimental results. For example, to describe the stress-strain relation of materials, Swift and Voce models are widely used, and Hill non-quadratic and Hosford yield functions are usually applied in modeling the yield locus, because of their simple expression with only two parameters. Similarly, the most ductile failure models with a few parameters are Clift and Oyane models. However, the above-mentioned models have at most two parameters in their equations and intrinsically have limited accuracy. Of course, introduction of more parameters in plasticity models may yield more accurate solutions, such as the Barlat (2003) yield function which has eight parameters. Nevertheless, these proposed models significantly increase the computational cost and may introduce inevitable errors in estimating their parameters.
To overcome this disadvantage, this study proposes three-parameter models to describe the governing equation of the above mentioned topics. These models achieve a balance between accuracy and computational cost in engineering.

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Abstract
1. Introduction
2. New equation for constitutive relation of stress and strain
3. Modified Drucker model of yield criterion
4. Application of ductile fracture model with three parameters model
5. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2017-551-000838487