Laser forming of a bowl shaped surface with a stationary laser beam

Chakraborty, Shitanshu Shekhar; More, Harshit; Nath, Ashish Kumar

doi:10.1016/j.optlaseng.2015.08.006

Cited by 23 publications

(6 citation statements)

References 14 publications

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“…Safari and Farzin [ 19 ] performed an experimental work in which a laser scanning sequence with a spiral irradiating scheme to generate a saddle shape was proposed and assessed in terms of the effect of the pitch in the spiral path, the number of spiral paths, and its direction (in-to-out and out-to-in spiral paths) on the final shape. Chakraborty et al [ 20 ] carried out experiments and simulations of the forming of bowl-shaped surfaces on flat circular blanks via concentric laser irradiations, where the effect of the duration of the laser irradiation and beam spot diameter on the amount of bending of the desired shaped was specifically studied. With the purpose of producing a representative ship hull shape with laser forming, Gao et al [ 21 ] developed and experimentally validated a technique to determine, via numerical simulation, the optimal irradiation patterns and operating parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Validation of Sheet Laser Forming Processes Using General Scanning Paths

et al. 2018

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This work presents numerical simulations and an experimental validation of sheet laser forming processes using general scanning paths with different laser beam operating parameters (i.e., power, diameter, and scanning speed) in two specific graphite coated stainless steel blanks (i.e., with thicknesses of 0.3 mm and 0.6 mm for the AISI 302 and 304 alloys, respectively). To this end, three specific laser forming tests involving single S-shaped, multiple circular, and single piecewise linear scanning paths are carried out. On the other hand, the numerical simulation of these tests is performed via a coupled thermomechanical finite element formulation, accounting for large viscoplastic strains, temperature-dependent material properties, and convection-radiation phenomena. The final bending angles provided by this model are found to be in good agreement with the experimental measurements for all of the cases studied. Therefore, this modeling framework can be established as a reliable approach to predict the material thermomechanical response during sheet laser forming using general scanning paths.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Validation of Sheet Laser Forming Processes Using General Scanning Paths

et al. 2018

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“…The selection of the above-mentioned processing parameters are therefore crucial as previously reported by [7,8]. More recent studies deal with laser forming involving, e.g., the edge effect [9], three dimensional laser forming [10,11] and modelling of multiple scans [12]. However, these studies fall beyond the scope of the current investigation.…”

Section: Introductionmentioning

confidence: 89%

In Situ Digital Image Correlation Observations of Laser Forming

Fidder¹,

Admiraal²,

Ocelík³

et al. 2019

Metals

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In this study experimental and modelling methods are used to examine the microstructural and bending responses of laser-formed commercially pure titanium grade 2. The in situ bending angle response is measured for different processing parameters utilizing 3D digital image correlation. The microstructural changes are observed using electron backscatter diffraction. Finite element modelling is used to analyse the heat transfer and temperature field inside the material. It has been proven that the laser bending process is not only controlled by processing parameters such as laser power and laser beam scanning speed, but also by surface absorption. Grain size appears to have no influence on the final bending angle, however, sandblasted samples showed a considerably higher final bending angle. Experimental and simulation results suggest that the laser power has a larger influence on the final bending angle than that of the laser transverse speed. The microstructure of the laser heat-affected zone consists of small refined grains at the top layer followed by large elongated grains. Deformation mechanisms such as slip and twinning were observed in the heat-affected zone, where their distribution depends on particular processing parameters.

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“…This paper delves into the application of laser-induced thermal stress for shaping these materials. Chakraborty et al [4] conducted an experiment to create a bowl-shaped surface utilizing a stationary laser beam and observed that the bend angle increased proportionally with the duration of irradiation, while keeping the laser power and diameter constant. Furthermore, they noted that the direction of bending was influenced by the size of the laser beam diameter.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of deformation behaviour of circular sheet during laser forming process

Samal,

Nath,

Yadav

et al. 2023

E3S Web Conf.

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Laser forming of sheet metal involves inducing a bending process through the application of thermal stress using a defocused laser source. In laser forming the formation of bowl-shaped shapes requires the input of various laser process parameters. In this study, we investigate the thermo-mechanical deformation behaviour of a circular plate subjected to laser irradiation scanning. To analyse this phenomenon, we employ the Finite Element Method (FEM) with the aid of the software ABAQUS 6.10. The moving laser heat source is modelled as Gaussian heat flux, and DFLUX subroutine is written in FORTRAN. The work piece material AH36 is considered. The Finite Element Method (FEM) proposed model is verified against experimental results. Additionally, a parametric study has been conducted to assess the impact of laser process parameters on the temperature distribution of AH 36 material. The temperature distribution is noted to rise with an increase in laser power. However, as the scanning speed and laser beam diameter of the circular laser heat source increase, both temperature and bend angle exhibit a continuous decrease. Further, it is found the plastic strain is measured along the laser irradiation path, therefore the averaged material properties are not altered of the dome shaped obtained by laser forming. Based on the parametric studies, the optimum laser process parameters are also determined to get the dome shaped of the circular sheet.

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Laser forming of a bowl shaped surface with a stationary laser beam

Cited by 23 publications

References 14 publications

Numerical Simulation and Experimental Validation of Sheet Laser Forming Processes Using General Scanning Paths

Numerical Simulation and Experimental Validation of Sheet Laser Forming Processes Using General Scanning Paths

In Situ Digital Image Correlation Observations of Laser Forming

Finite element analysis of deformation behaviour of circular sheet during laser forming process

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