Numerical Simulation of Pulsed Laser Bending

Abstract

The aim of this work is to develop an efficient method for computing pulsed laser bending. During pulsed laser bending, thousands of laser pulses are irradiated onto the target. Simulations of the thermomechanical effect and bending resulted from all the laser pulses would exceed the current computational capability. The method developed in this work requires only several laser pulses to be calculated. Therefore, the computation time is greatly reduced. Using the new method, it is also possible to increase the domain size of calculation and to choose dense meshes to obtain more accurate results. The new method is used to calculate pulsed laser bending of a thin stainless-steel plate. Results calculated for a domain with a reduced size are in good agreement with those obtained by computing all the laser pulses. In addition, experiments of pulsed laser bending are performed. It is found that experimental data and computational results are consistent.

An integrated FEM-ANN model for laser bending process with inverse estimation of absorptivity

“…It is a common practice in modeling and simulation of the laser bending process using physics based hard computing methods viz. FEM (Hu et al 2001, Zhang et al 2002, Yanjin et al 2005, Kant and Joshi 2013. This equivalent absorptivity depends on many factors such as amount of burnt coating, temperature of the surface, plasma generated, melting condition, phase transformation, contact time and contact area of laser beam etc.…”

“…Hu et al (2001) studied the effect of process parameters on laser bending of stainless steel. Zhang et al (2002) developed an efficient numerical model for pulsed laser bending of full-hard 301 stainless steel. The computation time was significantly reduced by the proposed methodology.…”

Numerical investigation on the laser bending of stainless steel foil with pre-stresses

“…Recently several groups are undertaking studies on a varied range of materials and potential uses. Zhang et al (2002Zhang et al ( , 2003 studied the micro-scale laser bending of ceramics, silicon, and stainless steel by using a pulsed and a CW laser, respectively. Using a pulsed Nd:YAG laser and scanning optics, Dearden et al (2005), researchers from the laser group at the University of Liverpool, have obtained 2D and 3D laser micro-forming of thin metallic sheet and foil samples.…”

<title>Microscale bending using pulsed and cw laser</title>

“…The bending mechanisms are determined by the temperature field induced by the laser, the thickness and thermophysical properties of the specimens, scanning speed of the laser beam, etc. [10]. Bending is always toward the laser beam with the temperature gradient mechanism, while the bending direction depends on the pre-curvature and residual stress of the specimen for the other two mechanisms.…”