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Research Papers

Numerical Modeling and Mechanism Analysis of Hybrid Heating and Shock Process for Laser-Assisted Laser Peen Forming

[+] Author and Article Information
Mingsheng Luo, Zhenqiang Yao

State Key Laboratory of Mechanical System
and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Yongxiang Hu

State Key Laboratory of Mechanical System
and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
708 Mechanical Building
A No. 800 Dongchuan Road,
Shanghai 200240, China
e-mail: huyx@sjtu.edu.cn

Dong Qian

Department of Mechanical Engineering,
The University of Texas at Dallas,
800 W. Campbell Road,
Richardson, TX 75080

1Corresponding author.

Manuscript received August 16, 2017; final manuscript received July 12, 2018; published online August 31, 2018. Assoc. Editor: Hongqiang Chen.

J. Manuf. Sci. Eng 140(11), 111009 (Aug 31, 2018) (10 pages) Paper No: MANU-17-1516; doi: 10.1115/1.4040914 History: Received August 16, 2017; Revised July 12, 2018

Laser-assisted laser peen forming (LALPF) is proposed as a hybrid process to combine laser heating and laser peening to improve the bending capability of laser peen forming (LPF) effectively. To predict LALPF-induced bending deformation and mechanism of bending capability improvement, a sequentially coupled modeling approach is established by integrating three models, i.e., a thermoelastic-plastic model to predict the temperature, a dynamic model to obtain the eigenstrain of laser shock, and an eigenstrain model to predict the bending deformation. The effects of temperature, thermal stress, and thermal plastic strain of laser heating and the coupling effects on the bending deformation were investigated. The results show that the interaction of temperature and thermal stress are the dominant factors contributing to the improvement of bending capability.

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Figures

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Fig. 1

Schematic illustration of LALPF

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Fig. 2

Schematic of LALPF experiments: (a) experimental setup and (b) scanning strategy of laser irradiations

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Fig. 3

Schematic of the thermal model

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Fig. 4

Validation of the thermal model: (a) the temperature measurement setup and (b) the peak temperature of thermal model and experiment

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Fig. 5

The temperature field from the simulation of laser heating center of lines with corresponding time: (a) the time of 1.5 s, (b) the time of 32.5 s, (c) the time of 94.5 s, (d) the time of 94.5 s, and (e) the time of 125.5 s

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Fig. 6

(a)–(c) The modeling procedure for LALPF and (d) the shock pressure in the dynamic model

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Fig. 7

Results of FE model of LALPF: (a) the temperature, stress and plastic strain in the thermoelastic-plastic model of laser heating and (b) the plastic strain in the dynamic model for LALPF and LPF

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Fig. 8

Validation of FE model of LALPF: (a) photos of workpiece deformed out of plane of LALPF and LPF, (b) the measured contour of the deformed shape for workpieces after LPF and LALPF, (c) the predicted contour of the deformed shape for workpieces after LPF and LALPF, and (d) the comparison of predicted deformation with experimental data

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Fig. 9

The plastic strain in the z-direction by averaged in the representative cell for LALPF and LPF with the pulse laser power density of 3.7 GW/cm2 and the CW laser power of 142 W

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Fig. 10

The effect of single factor: (a) the plastic strain curve of dynamic model, (b) the comparison of thermal plastic strain with plastic strain of dynamic model with the initial condition of thermal plastic strain, and (c) the deformation of workpiece caused by single factor

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Fig. 11

The enhancement effect of multifactor compared with LPF: the increment of average plastic strain curve in the dynamic model and the increment of are height predicted by eigenstrain model with the initial condition of (a) temperature and thermal stress, (b) temperature and thermal plastic strain, and (c) thermal plastic strain and thermal stress

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Fig. 12

The explain of the coupling effect of laser-assisted heating to the laser peening

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