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유한요소법을 이용한 LSP 표면처리 공정의 잔류응력 예측
방부운(Boowoon Bang),손승길(Seungkil Son),김재민(Jaemin Kim),조종두(Chongdu Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Laser shock peening(LSP) is proving to be better surface treatment than conventional one such as shot peening. The LSP process has a compressive residual stress into a metal alloy and a significant improvement in fatigue life. Our research is focused on applying finite element method to the prediction of residual stress through the LSP processing in some LSP conditions such as pressure and spot size induced by laser. Two analysis methods are considered to calculating the compressive residual stress. But the explicit solution and the static one after partially explicit solving are almost same. In LSP, because of very high strain rate(10?s?¹), HEL(Hugoniot Elastic Limit) is the most important parameter in material behavior modeling. As the circular laser spot is considered, 2-D axisymmetric elements are used and the infinite elements are applied to boundaries for no reflection. The relations of material properties and the LSP are also important parts in this study.
유한요소법을 이용한 LSP 표면처리 공정의 잔류응력 예측
방부운(Boowoon Bang),손승길(Seungkil Son),김재민(Jaemin Kim),조종두(Chongdu Cho) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.8
Laser shock peening(LSP) is proving to be better surface treatment than conventional one such as shot peening. The LSP process has a compressive residual stress into a metal alloy and a significant improvement in fatigue life. Our research is focused on applying finite element method to the prediction of residual stress through the LSP processing in some LSP conditions such as pressure and spot size induced by laser. Two analysis methods are considered to calculating the compressive residual stress. But the explicit solution and the static one after partially explicit solving are almost same. In LSP, because of very high strain rate(106s-1), HEL(Hugoniot Elastic Limit) is the most important parameter in material behavior modeling. As the circular laser spot is considered, 2-D axisymmetric elements are used and the infinite elements are applied to boundaries for no reflection. The relations of material properties and the LSP are also important parts in this study.
레이저 플라즈마 충격 피닝에 의한 Al6061 합금의 잔류응력 연구
최은영(Eun-young Choi),방부운(Boowoon Bhang),손승길(Seungkil Son),조종두(Chongdu Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Laser Plasma Shock Peening(LPSP) or Laser Shock Peening(LSP) has been used as a surface treatment method for metals and metal alloys. LPSP became a guarantee because the intensity of the laser beam would be uniform across the component being peened. Also the compressive residual stresses were not limited in depth. LPSP process was performed with changing laser pulse density and black painted surface condition. Surface residual stress of the Al6061 alloy was calculated by using X-ray diffraction(XRD) method, and also the residual stress in the direction of depth was measured with hole-drilling strain gage method. From the results, it is shown that the laser pulse density is proportional to the value of compression residual stress. And black painting on the surface of Al6061 alloy increased the compression residual stress.