Chinese Journal of Lasers, Volume. 49, Issue 2, 0202016(2022)
Porous Structure Design and Mechanical Properties Analysis of Femoral Stem Based on Selective Laser Melting
Figures & Tables(16)
Fig. 2. Relationship between C value and porosity in TPMS structure. (a) P structure; (b) G structure; (c) D structure
Fig. 3. Parameter definitions and sample models of TPMS structures. (a) Wall thickness and pore size; (b) sample model
Fig. 5. Design of porous femoral stem and boundary conditions setting. (a) Porous femoral stem; (b) boundary condition
Fig. 6. Porous TPMS samples prepared by selective laser melting (SLM) and their surface topographies. (a) Porous TPMS samples; (b) surface topographies
Fig. 7. Compressive stress-strain curves of TPMS porous samples. (a) P structure; (b) G structure; (c) D structure
Fig. 8. Relationship between porosity and mechanical properties of TPMS porous samples. (a) Elastic modulus; (b) yield strength
Fig. 9. Relationship between thickness and mechanical properties of TPMS porous structures. (a) Elastic modulus; (b) yield strength
Fig. 10. Relationship between relative density and mechanical properties. (a) Relationship between relative density and relative modulus; (b) relation between relative density and relative strength
Fig. 11. Stress distributions in femur. (a) Stress distribution in medial femur; (b) stress distribution in lateral femu; (c) stress distribution inside the femur
Fig. 13. Gruen zoning diagram and stress distributions in femur before and after surgery. (a) Gruen zoning diagram; (b) stress distribution in femur before surgery; (c)－(h) stress distribution in femur after surgery
Table 1. Design parameters of TPMS structural samples
View tableTable 1. Design parameters of TPMS structural samples
Type (size) Parameter Design 1 Design 2 Design 3 Design 4 Design 5 P (unit size: 3 mm; sample size: 12 mm×12 mm×12 mm) Porosity /% 55 60 65 70 75 Constant C 0.79 0.70 0.61 0.53 0.44 Pore size /mm 0.63 0.76 0.88 0.97 1.02 Thickness /mm 0.67 0.58 0.50 0.42 0.34 G (unit size: 4 mm; sample size: 16 mm×16 mm×16 mm) Porosity /% 55 60 65 70 75 Constant C 0.69 0.62 0.54 0.46 0.39 Pore size /mm 0.81 0.90 0.99 1.08 1.17 Thickness /mm 0.65 0.58 0.50 0.42 0.36 D (unit size: 4 mm; sample size: 16 mm×16 mm×16mm) Porosity /% 55 60 65 70 75 Constant C 0.54 0.48 0.42 0.36 0.30 Pore size /mm 0.89 0.96 1.02 1.08 1.14 Thickness /mm 0.51 0.46 0.40 0.34 0.28
Table 2. Chemical composition of Ti-6Al-4V powder
View tableTable 2. Chemical composition of Ti-6Al-4V powder
Element Mass fraction /% Al 6.0－6.5 V 3.5－4.5 O ≤0.10 N ≤0.03 C ≤0.08 H ≤0.012 Fe ≤0.25 Ti Bal.
Table 3. Calculated elastic modulus and yield strength of TPMS porous samples
View tableTable 3. Calculated elastic modulus and yield strength of TPMS porous samples
Type Designed porosity /% Thickness /mm Elastic modulus /GPa Yield strength /MPa P 55 0.67 13.33 638.89 60 0.58 12.29 601.02 65 0.50 11.22 558.74 70 0.42 10.22 472.21 75 0.34 9.19 414.44 G 55 0.65 11.32 583.87 60 0.58 11.18 537.51 65 0.50 10.89 504.33 70 0.42 9.82 465.29 75 0.36 9.50 427.67 D 55 0.51 13.44 603.14 60 0.46 12.98 598.41 65 0.40 12.87 571.64 70 0.34 12.52 538.27 75 0.28 12.28 527.12
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Shoujin Zeng, Guang Liu, Chuansheng Li, Jianhua Ye, Dichen Li. Porous Structure Design and Mechanical Properties Analysis of Femoral Stem Based on Selective Laser Melting[J]. Chinese Journal of Lasers, 2022, 49(2): 0202016
Paper Information
Category: laser manufacturing
Received: Jul. 28, 2021
Accepted: Sep. 2, 2021
Published Online: Dec. 13, 2021
The Author Email: Zeng Shoujin (zengshoujin@fjut.edu.cn)
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