Electron beam powder bed fusion additive manufacturing of Ti6Al4V alloy lattice structures: orientation-dependent fatigue strength and crack growth behaviour under compressive cyclic loading

IF 3.5 2区医学 Q2 ENGINEERING, BIOMEDICAL

Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2025-09-15 DOI:10.1016/j.jmbbm.2025.107201

Yawen Huang, Zhan Wen Chen

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引用次数: 0

Abstract

Sufficiently high fatigue strength is required for lattices made using electron beam powder bed fusion (EBPBF) for hip implants and understanding the anisotropic fatigue behaviour of EBPBF lattices is necessary for implant design. In this work, the combined effects of loading direction (LD) and cell orientation of EBPBF-Ti6Al4V lattices on the fatigue strength of the structures under cyclic compressive loading have been studied. Simple cubic (SC) ([001]//LD, [011]//LD and [111]//LD) lattices with a relative density of 0.36 were EBPBF made, tested and examined. The fatigue strength of [001]//LD lattices has been determined to be ∼190 MPa at 5 × 10⁶ cycles, ∼8 times higher than that of [011]//LD or [111]//LD lattices. The low fatigue strength of the non-[001]//LD lattices resulted from crack initiation readily occurring in the high tension locations, which are the top and bottom locations of each unit cell. Sideway growth of cracks leading to fracturing along (001) will be shown. This failure mechanism is absent in [001]//LD lattices and thus their fatigue strength is high. Examining the data in the literature has shown that fatigue strength values of all non-SC lattice structures are low, likely due to the same failure mechanism identified for non-[001]//LD SC lattices in this study.

查看原文本刊更多论文

电子束粉末床熔合增材制造Ti6Al4V合金晶格结构：压缩循环载荷下取向相关的疲劳强度和裂纹扩展行为。

使用电子束粉末床熔合（EBPBF）制造的髋关节植入物晶格需要足够高的疲劳强度，了解EBPBF晶格的各向异性疲劳行为是植入物设计的必要条件。本文研究了EBPBF-Ti6Al4V晶格的加载方向（LD）和晶格取向对循环压缩载荷下结构疲劳强度的联合影响。制备了相对密度为0.36的简单立方（SC）（[001]//LD， [011]//LD和[111]//LD）晶格，并对其进行了测试和检测。在5 × 106次循环下，[001]//LD晶格的疲劳强度为~ 190 MPa，比[011]//LD或[111]//LD晶格的疲劳强度高~ 8倍。非[001]//LD晶格的低疲劳强度是由于裂纹容易发生在高张力位置，即每个单元胞的顶部和底部位置。裂缝沿（001）的横向扩展导致破裂。这种破坏机制在[001]//LD晶格中不存在，因此它们的疲劳强度很高。研究文献中的数据表明，所有非SC晶格结构的疲劳强度值都很低，可能是由于本研究中发现的非[001]//LD SC晶格的破坏机制相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.