形形状对周期格子的机械和吸收性能的影响
Sepideh Bayat1, Ahmadreza Farjood2, Zahra-Sadat Seyedraoufi3
1Department of Materials and Metallurgical Engineering, University of Tehran, Tehran, Iran.
Scientific reports
|November 25, 2025
概括
经过修改的周期格子结构提供了强度和重量节省之间的平衡. 这些超材料中适度的支柱孔穿孔可以提高能量吸收,同时减少质量,非常适合抗冲击应用.
科学领域:
- 材料科学与工程 材料科学与工程
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 机械超材料,特别是修改周期格子结构 (MPLS),对于先进的工程应用至关重要.
- 沉积建模 (FDM) 是一种关键的增材制造技术,用于创建复杂的格子几何形状.
- 了解格子结构的机械行为和能量吸收对于设计轻量级和抗冲击组件至关重要.
研究的目的:
- 为了研究FDM打印的MPLS的机械行为和能量吸收特性,具有不同的支柱孔穿孔.
- 评估支柱孔穿孔,机械性能 (强度,能量吸收) 和质量减少之间的权衡.
- 为了验证,将实验结果与有限元 (FE) 模拟进行比较.
主要方法:
- 使用FDM与PLA+制造五个MPLS样本 (MPLS-0到MPLS-20),具有不同的支柱孔直径.
- 根据ISO 13,314标准对格子样本进行单轴压缩测试.
- 使用Abaqus进行有限元 (FE) 模拟,以分析应力度和变形模式.
主要成果:
- 固体支架 (MPLS-0) 显示出最高的收益强度 (13.61 MPa),能量吸收密度 (13.26 J/cm3) 和特定能量吸收 (2.41 J/g).
- 穿孔的增加导致强度和能量吸收的减少,MPLS-20显示的值明显较低.
- 中度穿孔 (MPLS-5,MPLS-10) 实现了大量的重量节省 (高达10%),同时保持了75-83%的固体支架强度.
- FE模拟显示空洞支架中局部应力和扭曲效应,较高孔隙度的网格显示长时间的变形.
结论:
- 在MPLS中,支柱孔穿孔,机械完整性和质量减少之间存在明显的权衡.
- 中等孔径为航空航天,汽车和保护系统中的轻量级,抗冲击设计提供了最佳平衡.
- 在格子结构中,控制的几何结构对于定制机械性能和能量消耗能力至关重要.
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