Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion

Runping Chen; Dongyun Zhang; Songtao Hu; Yangli Xu; Tingting Huang; Long Zhang; Zhiyuan Liu

doi:10.3788/LOP202158.1714006

Laser & Optoelectronics Progress, Volume. 58, Issue 17, 1714006(2021)

Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion

Runping Chen^1,2, Dongyun Zhang^1,2、*, Songtao Hu^1,2, Yangli Xu^1,2, Tingting Huang^1,2, Long Zhang^1,2, and Zhiyuan Liu^1,2

Author Affiliations

¹Institute for Laser Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

²Beijing Engineering Research Center of 3D Printing for Digital Medical Health, Beijing , 100124, China

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Figures & Tables(14)

Fig. 1. Description of physical model and stress condition of human skeleton element

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Fig. 2. Establishment of topology optimization model

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Fig. 3. Topology optimization cells with different porosity. (a) Porosity 60%; (b) porosity 70%; (c) porosity 80%

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Fig. 4. Cell models created by Solidworks. (a) Porosity 60%; (b) porosity 70%; (c) porosity 80%

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Fig. 5. Unit porous structure with different porosity. (a) Porosity 60%; (b) porosity 70%; (c) porosity 80%

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Fig. 6. Porous structure samples. (a) 6-60 sample; (b) 6-70 sample; (c) 6-80 sample

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Fig. 7. Stress-strain curves of porous structure specimen

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Fig. 8. Compression deformation process of porous structures with different porosity (ε is compression deformation)

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Fig. 9. Stress distribution of porous structure with different porosity. (a) Porosity 60%; (b) porosity 70%;（c）porosity 80%

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Fig. 10. Stress distribution in porous structure. (a) Porosity 60%; (b) porosity 70%; (c) porosity 80%

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Fig. 11. Experimental and simulated compressive stress-strain curves of porous structure with different porosity. (a) Porosity 60%; (b) porosity 70%; (c) porosity 80%

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Fig. 12. Compressive strength and compression modulus of porous structure

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Table 1. Comparison of chemical composition (mass fraction) of TC4 powder with ASTM F136-12 standard
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Table 1. Comparison of chemical composition (mass fraction) of TC4 powder with ASTM F136-12 standard
Element Al V O N C H Fe Ti
TC4 powder 6.49 4.29 0.074 0.01 0.008 0.0033 0.18 Bal.
ASTM F136-12 standard 5.5‒6.5 3.5‒4.5 <0.13 <0.05 <0.08 <0.012 <0.25 Bal.

Table 2. Forming process parameters of TC4 porous structure
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Table 2. Forming process parameters of TC4 porous structure
Forming structure Laser power /W Scanning speed/（mm·s^-1） Scanning interval /mm Powder layer thickness /μm
Supporting structure 100 600 0.10 60
Physical part 170 1250 0.10 30

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Runping Chen, Dongyun Zhang, Songtao Hu, Yangli Xu, Tingting Huang, Long Zhang, Zhiyuan Liu. Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion[J]. Laser & Optoelectronics Progress, 2021, 58(17): 1714006

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