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이용신,여은구 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-
The main objective of this study is to provide the mechanical properties of casting mold material, STD61, which are essential for the fatigue analysis of casting mold. The stress-strain curves and stress-life curves of a mold steel, STD61 are experimentally obtained. The wide ranges of temperature from 300℃ to 900℃ are considered in experiments and the transition temperature zone is carefully examined. Also, the specific equations of the S-N curves at the warm and hot temeperatures are given.
이용신 한국소성가공학회 2001 소성가공 : 한국소성가공학회지 Vol.10 No.7
Shape changes of a workpiece in an Eulerian Finite Element analysis for the steady state, three-roll-stand shape rolling are modelled. Although an Eulerian analysis has many advantages for the steady state rolling problems, it necessitates an assumption about the unknown shape of the control volume. In almost all cases, the assumed control volume does not match the final shape and the control volume should be updated. This update can be accomplished by performing a free surface correction. The final shape of a material point, which has a spherical shape at the inlet, can be also predicted by integrating a deformation gradient along a stream line. Analyses of three-roll-stand shape rolling are performed and the results are discussed in detail.