FEM analysis for laser bending process of DP980 steel sheet

Zhang, Ya Jing; Kim, Jong-Bong; Song, Jung Han; Lee, Geun An; Lee, Hye Jin; Lee, Nak Kyu

doi:10.1007/s12541-015-0042-0

Cited by 19 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of laser-bending to high strength steel sheet (DP980) was analyzed using the FEM technique. 1 The spring-back predictions in the roll-bending of a pre-coated material (PCM) 2 and in die-bending 3 were investigated using the FEM technique. Due to the merits of the die-bending process, whereby several different kinds of shapes and sizes can be fabricated with low production-costs and in a short-time, this process was the focus of the present research.…”

Section: Introductionmentioning

confidence: 99%

Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes

Thipprakmas

Boochakul

2015

Int. J. Precis. Eng. Manuf.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes

Thipprakmas

Boochakul

2015

Int. J. Precis. Eng. Manuf.

View full text Add to dashboard Cite

“…This process makes a stable bending toward the laser beam. 22,23 A schematic of laser bending process is shown in Figure 2. 21 Kotobi and Honarpisheh 21 investigated throughdepth residual stress distribution of commercially pure Grade-2 titanium parts which were subjected to laser bending.…”

Section: Introductionmentioning

confidence: 99%

“…This process makes a stable bending toward the laser beam. 22,23 A schematic of laser bending process is shown in Figure 2. 21…”

Section: Introductionmentioning

confidence: 99%

Through-depth residual stress measurement of laser bent steel–titanium bimetal sheets

Kotobi

Honarpisheh

2018

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

Laser bending is one of the thermal forming processes which in each pass of it, the temperature of sample increases at heat-affected zone during irradiation time considerably and then it cools to near ambient temperature after passing the laser beam. Consequently, it can be predicted that the process can induce significant residual stress in the sample. In this article, laser bending process of the explosive welded steel-titanium bimetal sample was done and the through-thickness residual stress profile of it was investigated by the slitting method experimentally. The pulse-regularization approach was used to calculate the residual stress in the bimetal sample. Also, simulation of the laser bending process was performed and the numerical residual stress profile was compared with the experimental one. Furthermore, the effects of process parameters including laser power, scanning velocity and number of scanning passes on the bending angle of bimetal samples were investigated experimentally. Besides, the effect of laser bending process on the surface microhardness was studied. The results demonstrated that the laser bending process can create significant residual stress at the heataffected zone of specimen. In the residual stress profile of bimetal sample, a discontinuity was seen at the interface of the materials, as was expected. There was a good agreement between experimental and numerical results. The maximum compressive and tensile residual stresses raised by increase laser power and number of scanning passes. Both of them reduced by magnifying scanning velocity. The laser bending process can increase the surface microhardness at the heat-affected zone which can be attributed to the reduction of grain size at the heat-affected zone.

show abstract

“…In the laser bending process, a defocused laser beam with definite parameters is irradiated on the surface of sheet and consequently some thermal stresses are introduced in the part which forms the sheet. [21][22][23] One of the common mechanisms of laser forming is temperature gradient mechanism in which operational parameters should be selected in a manner that causes a temperature gradient through the thickness of the sample. Because of the temperature gradient in the heated area, top side of the part expands more than the bottom side in the beginning of the laser bending process.…”

Section: Introductionmentioning

confidence: 99%

“…A stable bending toward the laser beam is created by this process in the end. 22,24 Figure 2 illustrates a schematic diagram of laser bending process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of through-thickness residual stress of laser-bent Ti samples

Kotobi

Honarpisheh

2017

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

One of the important parameters that can influence on performance of a part and its life is residual stress. All manufacturing processes can create residual stress in different ranges. Laser bending is one of the thermoforming processes that has been used in different industries. The aim of this study is investigation of through-thickness residual stress profile of Grade 2 titanium samples that were subjected to laser bending process. Slitting method was used to measure the residual stress profile experimentally. Both series expansion and pulse-regularization methods that are common computational techniques in the slitting method were employed to calculate the residual stress. Besides, finite element simulation of the laser bending process was done to study the through-depth residual stress distribution numerically. The results of two computational techniques were compared to each other and with the finite element method results. Furthermore, the effect of laser bending process on surface roughness and microhardness of the samples at the heat-affected zone was investigated. The results showed that laser bending process can induce considerable residual stress in the heataffected zone of the part. Comparing the experimental and finite element method results showed good agreement between them. In comparison with the control sample, both surface roughness and microhardness of the samples increased after the laser bending process.

show abstract

FEM analysis for laser bending process of DP980 steel sheet

Cited by 19 publications

References 8 publications

Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes

Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes

Through-depth residual stress measurement of laser bent steel–titanium bimetal sheets

Experimental and numerical investigation of through-thickness residual stress of laser-bent Ti samples

Contact Info

Product

Resources

About