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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Compression-compression fatigue of selective electron beam melted cellular titanium (Ti-6AI-4V)
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Compression-compression fatigue of selective electron beam melted cellular titanium (Ti-6AI-4V)

机译：选择性电子束熔化的多孔钛（Ti-6AI-4V）的压缩-压缩疲劳

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摘要

Regular 3D periodic porous Ti-6AI-4V structures intended to reduce the effects of stress shielding in load-bearing bone replacement implants (e.g., hip stems) were fabricated over a range of relative densities (0.17-0.40) and pore sizes (approx500-1500 urn) using selective electron beam melting (EBM). Compression-compression fatigue testing (15 Hz, R = 0.1) resulted in normalized fatigue strengths at 10~6 cycles ranging from 0.15 to 0.25, which is lower than the expected value of 0.4 for solid material of the same acicular a microstructure. The three possible reasons for this reduced fatigue lifetime are stress concentrations from closed porosity observed within struts, stress concentrations from observed strut surface features (sintered particles and texture lines), and microstructure (either acicular alpha or martensite) with less than optimal high-cycle fatigue resistance.
机译：在一定的相对密度（0.17-0.40）和孔径范围（大约500-500微米）范围内制造了规则的3D周期性多孔Ti-6AI-4V结构，旨在减少承重骨替代植入物（例如，髋关节）中应力屏蔽的影响。 1500 urn）使用选择性电子束熔化（EBM）。压缩-压缩疲劳试验（15 Hz，R = 0.1）导致10〜6个循环的归一化疲劳强度为0.15至0.25，低于相同针状微观结构的固体材料的0.4的预期值。降低疲劳寿命的三个可能原因是：在支杆内观察到的封闭孔隙中的应力集中，在观察到的支杆表面特征（烧结的颗粒和织构线）中产生的应力集中以及微观结构（针状α或马氏体）都没有达到最佳高循环率。耐疲劳。

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