Numerical Analysis of Elastic-Plastic Deformation Evolution and Fracture Behavior in Tensile Process of Laser Lap Welded 301L Joints

Fig. 7. Equivalent plastic strain analysis of 0.8+2.0 specimen. (a) Comparison of experimental and simulated tensile curves; (b) equivalent plastic strain distribution at point A; (c) equivalent plastic strain distribution at point B; (d) equivalent plastic strain distribution at point C; (e) equivalent plastic strain distribution at point D

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Fig. 8. Equivalent plastic strain analysis of 2.0+2.0 specimen. (a) Comparison of experimental and simulated tensile curves; (b) equivalent plastic strain distribution at point E; (c) equivalent plastic strain distribution at point F; (d) equivalent plastic strain distribution at point G; (e) equivalent plastic strain distribution at point H

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$Mises stress distribution within weld when tensile specimen fractures$

Fig. 9. Mises stress distribution within weld when tensile specimen fractures

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Fig. 10. Relationship between average Mises stress within weld and tensile displacement of 1.5+1.5 specimen

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Fig. 11. Relationship between average stress within weld and displacement load of 2.0+2.0 specimen under different bw/t1

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$Equivalent plastic strain distributions of 2.0+2.0 tensile fracture specimens under different bw/t1. (a) 0.45; (b) 0.60; (c) 0.75; (d) 0.90$

Fig. 12. Equivalent plastic strain distributions of 2.0+2.0 tensile fracture specimens under different bw/t1. (a) 0.45; (b) 0.60; (c) 0.75; (d) 0.90

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Table 1. The chemical composition and mechanical property of 301L-DLT sheet
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Table 1. The chemical composition and mechanical property of 301L-DLT sheet
Sheet Mass fraction /% σ_s /MPa σ_b /MPa δ /%
C Si Mn P S Ni Cr N
301L-DLT <0.03 <1.0 <2.0 <0.045 <0.03 6-8 16-18 <0.2 >350 >700 >40

Table 2. Geometric size of laser lap welded specimen
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Table 2. Geometric size of laser lap welded specimen
Specimen Penetrating platethickness t₁ /mm Facade platethickness t₂ /mm Interfacial weldwidth b_w /mm Weld depth of facadeplate h /mm
0.8+2.0 0.8 2.0 0.85 0.30
2.0+2.0 2.0 2.0 0.90 0.30

Table 3. Tensile experimental results
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Table 3. Tensile experimental results
Specimen Weld widthb_w /mm b_w/t₁ Fracturedisplacement /mm Fractureload /(N·mm^-1) Fracture position
0.8+2.0 0.85 1.06 15.72 571.98 Weld
2.0+2.0 0.90 0.45 1.29 660.98 Weld

Table 4. Material properties of weld and base material in model
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Table 4. Material properties of weld and base material in model
Material Elastic modulus /GPa Poisson ratio Yield strength /MPa
Sheet 206 0.3 380
Weld 200 0.3 360

Table 5. Comparison of simulated and experimental tensile fracture displacements of 1.5+1.5 specimen
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Table 5. Comparison of simulated and experimental tensile fracture displacements of 1.5+1.5 specimen
Specimen b_w/t₁ Experimental tensile fracturedisplacement /mm Simulated fracturedisplacement /mm Error /%
1.5+1.5 0.87 19.08 17.5 8.3

Table 6. Tensile fracture displacements of 2.0+2.0 specimen under different bw/t1
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Table 6. Tensile fracture displacements of 2.0+2.0 specimen under different bw/t1
Specimen Fracture displacement /mm
$\begin{matrix} \frac{b_{w}}{t_{1}} \end{matrix}$ =0.45 $\begin{matrix} \frac{b_{w}}{t_{1}} \end{matrix}$ =0.60 $\begin{matrix} \frac{b_{w}}{t_{1}} \end{matrix}$ =0.75 $\begin{matrix} \frac{b_{w}}{t_{1}} \end{matrix}$ =0.90
2.0+2.0 1.2 2.9 8.0 17.8

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Xiangzhong Guo, Wei Liu, Changkun Wang, Huiyu Liu, Jiafei Fan. Numerical Analysis of Elastic-Plastic Deformation Evolution and Fracture Behavior in Tensile Process of Laser Lap Welded 301L Joints[J]. Chinese Journal of Lasers, 2018, 45(12): 1202003

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