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Jie Cheng(정걸),Tae Geun Park(박태근),Tae Hyun Baek(백태현) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Reflective photoelasticity is a widely used full-field technique for accurately measuring surface strains to determine the stresses in a part or structure during static or dynamic testing. Photoelastic phase-shifting method can be used for the determination of the phase values of isochromatics and isoclinics. Conventional Babinet-soleil compensation method and photoelastic phase-shifting technique were utilized to analyze a specimen with a triangle hole and a circular hole under bending. Three groups of results were obtained by conventional compensation method, 8-step phase-shifting method with reflective-type photoelastic arrangement and FEM (ABAQUS) simulation, respectively. They agree with each other relatively well considering experiment error. The reliability of this combined method can both improve and extend the two conventional methods to be applied to more new fields of stress analysis.
Residual Stress Analysis in Triplate Transition Joint Assemblies by Punch-forming
Jie Cheng(정걸),Tae Gyun Park(박태근),Tae Hyun Baek(백태현) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
Pre-produced Triplate transition joint assemblies are widely used in shipbuilding industry to make welds between aluminum and steel for a number of years now. The straight-shape transition joint assemblies should be bent during shipbuilding. So it is necessary to study the residual stresses created by punch forming in terms of different dimensions of punches, which would have heavy effects on performance of mechanical parts. ABAQUS is a suite of powerful engineering simulation programs, based on the finite element method. In this paper, ABAQUS was used as the main tool to simulate the residual stresses in a Triplate transition joint after unloading. Punch by pressing was carried to simulate bending moment in ABAQUS. The Triplate is consisted of three materials as base material (steel; Lloyd's Shipplate Gr. A), interlayer (pure aluminum; AI99.5) and superlayer (Al-Mg alloy; AlMg4.5Mn). Results from the ABAQUS analysis showed that increasing the radius of punch significantly reduces the von Mises residual stresses in steel. Changes of von Mises residual stresses in interlayer (Al99.5) and superlayer (AlMg4.5Mn) were negligible.