Selective Laser Melted Porous Ti-6Al-4 V Scaffolds: Modelling, Manufacturing, and Effect of Microstructure on Mechanical Properties

IF 1.6 4区 材料科学 Q2 Materials Science
Palash Mondal, Adil Wazeer, Apurba Das, Amit Roy Chowdhury, Amit Karmakar
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引用次数: 0

Abstract

Ti-6Al-4 V alloy is widely used in medical implants, particularly in orthopedics application. Additive manufacturing (AM), specifically selective laser melting (SLM) is useful for porous scaffolds fabrication where complex passages facilitaes bone re-growth. This study focused on the modeling, manufacture, and testing of microstructure and mechanical characteristics of seven different scaffolds (Diamond, Cross, Grid, Vinties, Tesseract, Star, and Octet) of 15 mm cube with 65% porosity. Average pore area and strut thickness of scaffolds are measured using Stereo microscope. All these fabricated scaffolds are experimentally tested under compressive loads in INSTRON testing machine. The compressive test results are also compared with the numerical simulation results generated using finite element analysis (ANSYS) software. Maximum load cell capacity of ± 25 kNis used during compression testing in INSTRON. The Grid type scaffold shows maximum ultimate compressive strength of 101.39 MPa and an effective elastic moduli of 10.33 GPa with an average pore area of 2,417,618.517 µm2 and strut thickness of 740.249 µm. This variant of the scaffold will be more compatible with the human bone’s elasticity, and it can also mitigate stress-shielding effects during healing.

Abstract Image

选择性激光熔融多孔 Ti-6Al-4 V 支架:建模、制造以及微观结构对力学性能的影响
Ti-6Al-4 V 合金广泛应用于医疗植入物,尤其是骨科应用。增材制造(AM),特别是选择性激光熔融(SLM)可用于多孔支架的制造,其复杂的通道有利于骨的再生长。本研究重点关注七种不同支架(Diamond、Cross、Grid、Vinties、Tesseract、Star 和 Octet)的建模、制造和微观结构与机械特性测试,这些支架的立方体为 15 毫米,孔隙率为 65%。使用立体显微镜测量了支架的平均孔隙面积和支柱厚度。所有这些制作好的支架都在 INSTRON 试验机上进行了抗压试验。压缩测试结果还与使用有限元分析(ANSYS)软件生成的数值模拟结果进行了比较。在 INSTRON 试验机上进行压缩试验时,传感器的最大承载能力为 ± 25 kN。网格型脚手架的最大极限抗压强度为 101.39 MPa,有效弹性模量为 10.33 GPa,平均孔隙面积为 2,417,618.517 µm2,支柱厚度为 740.249 µm。这种支架变体更符合人体骨骼的弹性,还能在愈合过程中减轻应力屏蔽效应。
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来源期刊
Transactions of The Indian Institute of Metals
Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys
CiteScore
2.60
自引率
6.20%
发文量
3
期刊介绍: Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.
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