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김채환(Chae Hwan Kim),김성호(Sungho Kim),오화진(Hwajin Oh),윤재륜(Jae Ryoun Youn) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Injection molding represents one of the most important processes for manufacturing plastic parts, but introduces residual stresses. This study employs incremental hole drilling method to evaluate the residual stress on injection molded automotive part. In order to verification the results, the commercial software Moldflow is used for residual stress analysis. Results obtained by experiments and Moldflow analysis agree with each other. The incremental hole-drilling method is potentially more applicable to determination of the residual stress in complex geometries and can be used as an adoptable technique for measurement of the residual stress in polymeric materials.
김채환(Chaehwan Kim),김성호(Sungho Kim),오화진(Hwajin Oh),윤재륜(Jae Ryoun Youn) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Injection molding is a flexible production technique for the manufacturing of polymer products, but introduces residual stresses. Residual stresses in a structural material or component are those stresses which exist in the object without other external loads. This paper introduces two comparative methods that can be used for the measurement of residual stress. The layer removal and hole drilling method are used for the measurement of residual stress in injection molded polystyrene part. Results obtained by experiments agree with each other. The hole drilling method is potentially more flexible for determining residual stress in complex geometries and can be used as an adoptable technique for the measurement of residual stress in polymeric materials.
김성호(SUNGHO KIM),김채환(CHAEHWAN KIM),오화진(HWAJIN OH),윤재륜(JAE RYOUN YOUN) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Injection molding is one of the most common operations in polymer processing. Good quality products are usually obtained and major post-processing is not required. However, residual stresses which exist in plastic parts after ejection affect the final shape and mechanical properties. Residual stresses are caused by polymer melt flow, pressure distribution, non-uniform temperature field, and density distribution. Residual stresses are predicted in this study by numerical methods using Hypermesh™, Moldflow™ and ABAQUS™. Residual stresses are measured by two methods, the Layer removal and Hole drilling method, but in this paper, we use hole drilling method because automotive part has complex shapes. We have presented that Hole drilling method is applicable to measure residual stresses. Residual stress distribution predicted by the thermal stress analysis is compared with the measuremental results obtained by Hole drilling method. And then we can verify them though 3D Scanning datum.