Finite Element Modeling Of Residual Stress Formation In Polycarbonate Welds
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Finite Element Modeling Of Residual Stress Formation In Polycarbonate Welds
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Author : Kittichai Sojiphan
language : en
Publisher:
Release Date : 2008
Finite Element Modeling Of Residual Stress Formation In Polycarbonate Welds written by Kittichai Sojiphan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Residual stresses categories.
Abstract: Formation of residual stresses during hot plate welding and other plastic welding processes can have detrimental effects on the joint quality under static and dynamic loading as well as reduce the corrosion resistance of the joints. Therefore, it is important to measure and predict residual stress level to prevent premature failures. Uncoupled finite element thermal analysis and viscoelastic stress-strain analysis were used to calculate the temperature distribution and history in the parts and thermal and residual stress formation during welding. Thermal properties and viscoelastic relaxation modulus of polycarbonate were compiled from the literature to build the material model for the finite element simulation. Residual stress levels in hot plate polycarbonate welds were computed for different hot plate temperatures and heating times. It was found that shorter heating times resulted in faster cooling rates and higher residual stress. The model was also used to calculate residual stresses in through transmission infrared and vibration welding of polycarbonate. The predicted residual stress levels and distributions were in good agreement with published experimental results for hot plate and through transmission infrared welding. Thus, finite element modeling is an effective way for predicting residual stress for a wide range of plastic welding method.
Theoretical And Experimental Analysis Of Residual Stress Formation After Implant Resistance Welding Of Polycarbonate
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Author : Joon Boo Park
language : en
Publisher:
Release Date : 1992
Theoretical And Experimental Analysis Of Residual Stress Formation After Implant Resistance Welding Of Polycarbonate written by Joon Boo Park and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Abstract: Formation of residual stress during thermoplastic welding causes detrimental effects to the joint quality under both dynamic and static loading conditions. Residual stress can reduce the solvent resistance of polymers as well as the tensile strength and fatigue life of the joint. Therefore, it is vital to predict and measure the level of residual stresses. Here, the formation of thermal and residual stresses during implant resistance welding of polycarbonate was studied. Thermocouples and an infrared temperature sensor were used to measure the temperature history and temperature distribution in the parts during welding. Heat flow analysis during implant resistance welding was done using Finite Element Method (FEM) and Finite Difference Method (FDM) which are connected with FEM and a simplified modeling analysis so-called "multi-bar analogy" respectively for stress analysis. FEM and FDM predictions of heat flow analysis were in good agreement with experimental measurements. The formation of thermal and residual stress was predicted using 2-D finite element analysis and multi-bar analogy in conjunction with non-isothermal linear viscoelasticity for a thermorheologically simple material. The residual stresses in the parts were measured using both photoelasticity and moire interferometry. Sectioning method utilizing moire interferometry was used to measure residual stress. FEM prediction of residual stress was in good agreement with photoelasticity measurement and moire interferometry measurement. Residual stress formation in the weld was predicted by multi-bar analogy modeling analysis and multi-bar analogy prediction was in good agreement with FEM prediction. Heat treatment to reduce residual stress after welding was performed. Residual stress distribution after heat treatment was predicted using FEM. The FEM prediction was in good agreement with photoelasticity measurement and moire interferometry measurement. This methodology for prediction, measurement and reduction of residual stress can be incorporated into the design, analysis, and welding procedures for plastic and composite joints. This will result in stronger and more reliable welds.
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening
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Author : Gkatzogiannis, Stefanos
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-06-30
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening written by Gkatzogiannis, Stefanos and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-30 with Technology & Engineering categories.
Research goal of the present monograph is the establishment of an efficient engineering approach, which will include straightforward but accurate simulation models, in order to estimate the residual stress fields of welded joints introduced during welding and their post-weld treatment with High Frequency Hammer Peening. The present subject lies on the intersection of structural engineering, material science and computational mechanics.
A Finite Element Model For Residual Stress In Repair Welds
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Author :
language : en
Publisher:
Release Date : 1996
A Finite Element Model For Residual Stress In Repair Welds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening
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Author : Stefanos Gkatzogiannis
language : en
Publisher:
Release Date : 2020*
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening written by Stefanos Gkatzogiannis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020* with categories.
Finite Element Modeling Of Residual Stress And Distortion From Welding Stainless Steel Structures
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Author : Herman F. Nied
language : en
Publisher:
Release Date : 2004
Finite Element Modeling Of Residual Stress And Distortion From Welding Stainless Steel Structures written by Herman F. Nied and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Hulls (Naval architecture) categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Modeling And Finite Element Analysis Of Welding Distortions And Residual Stresses In Large And Complex Structures
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Author : Jun Sun
language : en
Publisher:
Release Date : 2005
Modeling And Finite Element Analysis Of Welding Distortions And Residual Stresses In Large And Complex Structures written by Jun Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Finite Element Modeling Of Residual Stresses In Pipe Girth Welds
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Author : Yi Dong
language : en
Publisher:
Release Date : 1996
Finite Element Modeling Of Residual Stresses In Pipe Girth Welds written by Yi Dong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Finite Element Modeling And Validation Of Residual Stresses In 304 L Girth Welds
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Author :
language : en
Publisher:
Release Date : 1998
Finite Element Modeling And Validation Of Residual Stresses In 304 L Girth Welds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Three dimensional finite element simulations of thermal and mechanical response of a 304 L stainless steel pipe subjected to a circumferential autogenous gas tungsten arc weld were used to predict residual stresses in the pipe. Energy is input into the thermal model using a volumetric heat source. Temperature histories from the thermal analysis are used as loads in the mechanical analyses. In the mechanical analyses, a state variable constitutive model was used to describe the material behavior. The model accounts for strain rate, temperature, and load path histories. The predicted stresses are compared with x-ray diffraction determinations of residual stress in the hoop and circumferential directions on the outside surface of the pipe. Calculated stress profiles fell within the measured data. Reasons for observed scatter in measured stresses are discussed.