A study on an efficient prediction of welding deformation for T-joint laser welding of sandwich panel Part II : Proposal of a method to use shell element model
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I-core sandwich panel that has been used more widely is assembled using high power CO₂laser welding. Kim et al. (2013) proposed a circular cone type heat source model for the T-joint laser welding between face plate and core. It can cover the negative defocus which is commonly adopted in T-joint laser welding to provide deeper penetration. In part I, a volumetric heat source model is proposed and it is verified thorough a comparison of melting zone on the cross section with experiment results. The proposed model can be used for heat transfer analysis and thermal elasto-plastic analysis to predict welding deformation that occurs during laser welding. In terms of computational time, since the thermal elasto-plastic analysis using 3D solid elements is quite time consuming, shell element model with multi-layers have been employed instead. However, the conventional layered approach is not appropriate for the application of heat load at T-Joint. This paper, Part II, suggests a new method to arrange different number of layers for face plate and core in order to impose heat load only to the face plate.
Abstract
I-core sandwich panel that has been used more widely is assembled using high power CO₂laser welding. Kim et al. (2013) proposed a circular cone type heat source model for the T-joint laser welding between face plate and core. It can cover the negative defocus which is commonly adopted in T-joint laser welding to provide deeper penetration. In part I, a volumetric heat source model is proposed and it is verified thorough a comparison of melting zone on the cross section with experiment results. The proposed model can be used for heat transfer analysis and thermal elasto-plastic analysis to predict welding deformation that occurs during laser welding. In terms of computational time, since the thermal elasto-plastic analysis using 3D solid elements is quite time consuming, shell element model with multi-layers have been employed instead. However, the conventional layered approach is not appropriate for the application of heat load at T-Joint. This paper, Part II, suggests a new method to arrange different number of layers for face plate and core in order to impose heat load only to the face plate.
참고문헌 (8)
- 김재웅, "A study on an efficient prediction of welding deformation for T-joint laser welding of sandwich panel PART I : Proposal of a heat source model", International Journal of Naval Architecture and Ocean Engineering, 5(3), pp.348~363 (2013), 대한조선학회
- Kujala, P., "Steel sandwich panels in marine applications", Shipbuilding, 56, pp.305~314 (2005)
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- Mohd Shahar Sulaiman, "Simulation and experimental study on distortion of butt and T-joints using WELD PLANNER", Journal of Mechanical Science and Technology, 25(10), pp.2641~2646 (2011), 대한기계학회
- Tsirkas, S. A., "Numerical simulation of the laser welding process in butt-joint specimens", Journal of materials processing technology, 134(1), pp.59~69 (2003)
- Analysis and testing of a tapered end connection for laser welded steel sandwich panels, "Yourlmaz, S.", One Liberty Center, The University of Marine, ~, pp.Project report A770605 (2009)
- Zain-ul-Abdeina, M., "Prediction of laser beam welding-induced distortions and residual stresses by numerical simulation for aeronautic application", Journal of Materials Processing Technology, 209(6), pp.2907~2917 (2009)
- Zain-ul-Abdeina, M., "Experimental investigation and finite element simulation of laser beam welding induced residual stresses and distortions in thin sheets of AA 6056-T4", Materials science and engineering A, 527(12), pp.3025~3039 (2010)