Workability Theory of Materials in Plastic Deformation Processes. (2005)
Kobayashi,Shiro, Lee,C. H., Oh,S. I.
The investigation is aimed at establishing a workability criteria in upsetting and rolling with reference to occurrence of free surface cracks. A review of the background on workability is given,...
Deformation Mode of Void-Growth and Coalescence in the Process of Ductile Fracture. (2002)
The objective of this investigation was to develop a fracture criterion applicable to the prediction of the occurrence of cracks in metal-working processes. A model for large void growth was...
Shah,S. N., Kobayashi,Shiro, Oh,S. I.
The objective of this investigation was to establish theories on flow and fracture in order to apply workability theory to metalworking processes. It has been shown in the application to upsetting...
Chen,C. C., Oh,S. I., Kobayashi,Shiro
This investigation applies theories on flow and fracture in metalworking processes to prediction of workability of materials in axisymmetric bar extrusion and drawing, with special reference to...
Kim,J. H., Oh,S. I., Kobayashi,Shiro
This report describes the development of a finite-element model for analyzing sheet-metal forming processes. Materials are assumed to be rigid-plastic with the view that the usefulness of an analysis...
Fracture Criterion for Materials in Plastic Deformation Processes. (1999)
The investigation is aimed at establishing the workability of aluminum alloy 7075-T6 in upsetting and rolling at room temperature with reference to occurrence of free-surface cracks. The fracture...
Shear Bands in Forged Products. (1998)
Semiatin,S. L., Lahoti,G. D., Oh,S. I., Hoffmanner,A. L., Altan,T.
Shear bands, intense bands of localized deformation, are a primary source of defective forgings and their occurrence is a significant factor limiting the precision attainable by forging. The...
Hot Working of Titanium Aluminides-An Overview. (1998)
Semiatin, S. L., Oh, S. I., Florentino, R. J., Seetharaman, V., Malas, J. C.
The current understanding of the hot working behavior of ingot metallurgy alpha-two and gamma titanium aluminides is reviewed, both with regard to primary breakdown as well as secondary processing;...