密度分级对高级功能分级格子结构的机械行为的影响
Fabio Distefano1, Gabriella Epasto1
1Department of Engineering, University of Messina, Contrada di Dio, Vill. Sant'Agata, 98166, Messina, Italy.
概括
功能分级格子结构为生物医学应用提供可调节的机械性能. 这项研究发现,与分级设计相比,均密度格子表现出优越的机械性能,尽管分级结构显示出模仿骨特性的潜力.
科学领域:
- 生物材料工程 生物材料工程
- 机械工程 机械工程
- 生物医学工程 生物医学工程
背景情况:
- 格子结构对于其机械和生物特性在生物医学应用中至关重要.
- 功能分级材料 (FGMs) 提供可调节的特性,模仿像骨头这样的自然组织.
- 三次排列的八角形环 (TAOR) 代表了FGM的新晶格架构.
研究的目的:
- 研究TAOR网格结构的机械响应和故障机制,使用密度分级.
- 为了比较功能分级TAOR结构与均密度对应的性能.
- 评估TAOR结构模仿人类骨分级机械特性的潜力.
主要方法:
- 具有不同相对密度 (10-30%) 的合金样本是使用电子束炼制造的.
- 通过增加层次密度来创建功能分级的结构;统一的结构具有恒定的密度.
- 使用了机械压缩测试,扫描电子显微镜,数字显微镜和数字图像相关性 (DIC).
主要成果:
- 均密度格子结构表现出比功能分级结构更高的机械性能.
- DIC分析揭示了明显的变形行为,并使弹性模量计算成为可能.
- 设计和制造的TAOR结构之间的尺寸准确性得到了评估.
结论:
- 虽然均密度格子提供了优越的机械强度,但功能分级的TAOR结构对生物医学应用有希望.
- 在FG TAOR结构中设计局部机械性能的能力允许模仿皮质和结骨的独特特征.
- 这项研究提供了针对个性化骨科植入物优化格子结构设计的见解.
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