Tensile properties of three-dimensional printed porous
titanium alloy trabecular bone

doi:10.3969/j.issn.2095-4344.2274

Abstract

Abstract:

BACKGROUND: The three-dimensional printed titanium alloy porous structure has been developed rapidly in orthopedic implant design and clinical application due to its good mechanical properties and biocompatibility. Compared with coated prosthesis, the porous structure of titanium alloy trabecular bone has the advantages of fast and good bone growth. In order to ensure the safety of orthopedic implants, the tensile, shear and flexural fatigue strength of trabecular bone structures are determined by experimental methods.

OBJECTIVE: To investigate the mechanical properties of trabecular bone porous structure by mechanical experiments and finite element numerical simulation.

METHODS: (1) Tensile test of three-dimensional printed titanium alloy trabecular bone: three-dimensional printed titanium alloy trabecular bone was designed and fabricated. The wire diameter was 0.28-0.35 mm, the pore size was 0.71 mm, and the porosity was 73%. The tensile strength was detected, and the failure mechanism was analyzed. The effect of different printed parts on the tensile strength of trabecular bone was analyzed. (2) Numeric simulation test: a solid model of the tensile specimens including the theoretical structure of the trabecular bone was established to simulate the tensile failure process of trabecular bone specimens.

RESULTS AND CONCLUSION: (1) The ultimate load of the three-dimensional printed titanium alloy trabecular bone was 39.55-47.11 kN, and an equivalent ultimate tensile stress was 62.79-74.53 MPa. The result of tensile failure was fracture of the network structure, suggesting that titanium alloy trabecular bone had higher tensile strength. (2) Results of tensile test and numeric simulation test showed that the failure location of trabecular bone was mainly on the wire diameter, but not on the interface between trabecular bone and titanium alloy solid. (3) The tensile failure load obtained by numerical simulation was lower than that of experimental results. The main reason is that the wire diameter of the three-dimensional printed trabecular bone (280-350 μm) was larger than that of the theoretical size (142 μm), and the pore size (75% porosity) was smaller than the theoretical value (96% porosity).

Key words: three-dimensional printing, titanium alloy trabecular bone, tensile test, finite element method, numerical simulation, failure mechanism, wire diameter, tensile failure load

CLC Number:

Zhang Lan, Wang Xiang, Liu Jun, Zhang Chunqiu, Ye Jinduo, Liu Lu. Tensile properties of three-dimensional printed porous titanium alloy trabecular bone[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(22): 3498-3503.

Figures/Tables 6

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