http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Usefulness of three parameters models in engineering plasticity and sheet metal forming research
Quoc-Tuan Pham(팜쿽투완),Seok-Chul Shin(신석철),Young-Suk Kim(김영석) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
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.