Study of Edge Effects in Laser Bending

Bao, Jiangcheng; Yao, Y. Lawrence

doi:10.1115/imece1999-0760

Manufacturing Science and Engineering 1999

DOI: 10.1115/imece1999-0760

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Study of Edge Effects in Laser Bending

Jiangcheng Bao

Y. Lawrence Yao

Abstract: Laser forming has not been widely used due to limited understanding of its mechanism and immaturity of processing technology. In the study of single axis laser bending of plates, edge effects affect accuracy of the bending. Experimental and numerical studies are carried out to study the mechanism of the edge effects. Temperature dependency of material properties and strain-rate dependency of yield stress are considered in numerical simulation. Numerical results match well with experimental results. Patterns of… Show more

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Cited by 11 publications

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Experimental study and computer simulation of fracture toughness of sheet metal after laser forming

Cheng

Zhang

Chu

et al. 2004

Int J Adv Manuf Technol

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Fracture toughness is one of the most important mechanical properties for sheet metal in many applications. However not enough attention has been paid to the effects of laser forming conditions on fracture toughness of sheet metal. This paper presents an integrated fracture toughness model to study fracture toughness of sheet metal after laser forming. Microstructure, distribution of residual stresses and geometry of sheet metal specimen are considered in the model. Results of residual stress from microstructure-integrated finite element modelling of laser forming are incorporated in the model. Low carbon steel is used in this paper to validate the model. The results from the fracture toughness study are found to be consistent with microstructure analysis.

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Experimental study and computer simulation of fracture toughness of sheet metal after laser forming

Cheng

Zhang

Chu

et al. 2004

Int J Adv Manuf Technol

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Effect of phase transformations on laser forming of Ti–6Al–4V alloy

Fan

Cheng

Yao

et al. 2005

Journal of Applied Physics

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Surface deformation behavior of beta solution treated and overaged Ti-6Al-4V during laser shock processingIn laser forming, phase transformations in the heat-affected zone take place under steep thermal cycles, and have a significant effect on the flow behavior of Ti-6Al-4V alloy and the laser-forming process. The flow-stress data of a material are generally provided as only dependent on strain, strain rate, and temperature, while phase transformations are determined by both temperature and temperature history. Therefore, effect of phase transformations on the flow behavior of materials in thermomechanical processing is not given necessary considerations. In the present work, both the ␣ → ␤ transformation during heating and the decomposition of ␤ phase, producing martensite ␣Ј or lamellae ␣ dependent on cooling rate, are numerically investigated. The spatial distribution of volume fractions of phases is obtained by coupling thermal and phase transformation kinetic modeling. Consequently, the flow stress of Ti-6Al-4V alloy is calculated by the rule of mixtures based on the phase ratio and the flow stress of each single phase, which is also a function of temperature, strain, and strain rate. According to the obtained flow-stress data, the laser-forming process of Ti-6Al-4V alloy is modeled by finite element method, and the deformation is predicted. A series of carefully controlled experiments are conducted to validate the theoretically predicted results.

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Analysis and Prediction of Edge Effects in Laser Bending

Bao

Yao

2000

Journal of Manufacturing Science and Engineering

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Laser forming of sheet metal offers the advantages of requiring no hard tooling and thus reduced cost and increased flexibility. It also enables forming of some materials and shapes that are not possible now. In single-axis laser bending of plates, the bending edge is found to be somewhat curved and the bending angle varies along the laser-scanning path. These phenomena are termed edge effects, which adversely affect the accuracy of the bending and result in undue residual stress. Numerical investigations are carried out to study the process transiency and the mechanism of the edge effects. Temperature dependency of material properties and strain-rate dependency of flow stress are considered in the numerical simulation to improve prediction accuracy. Numerical results are validated in experiments. Patterns of edge effects and resultant residual stress distributions are examined under a wide range of conditions. A more complete explanation for the mechanism of the edge effects is given.

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Study of Edge Effects in Laser Bending

Cited by 11 publications

References 0 publications

Experimental study and computer simulation of fracture toughness of sheet metal after laser forming

Experimental study and computer simulation of fracture toughness of sheet metal after laser forming

Effect of phase transformations on laser forming of Ti–6Al–4V alloy

Analysis and Prediction of Edge Effects in Laser Bending

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