在准静态压缩下,特形波纹芯合金三明治板的机械和微观结构特性
Alessandra Ceci1, Girolamo Costanza1, Maria Elisa Tata1
1Department of Industrial Engineering, University of Rome Tor Vergata, 00133 Rome, Italy.
Materials (Basel, Switzerland)
|February 13, 2026
概括
形心状的三明治板提供了出色的能量吸收. 较薄的核心提供更高的刚性和峰值负载,使它们成为轻量级,渐进式应变应用的理想选择.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 结构分析 结构分析
背景情况:
- 带有梯形核心的三明治板以其低重量,高特异硬度和能量吸收而闻名.
- 了解核心几何学对机械性能的影响对于优化其应用至关重要.
研究的目的:
- 分析带有不同核心高度的梯形心芯三明治板的微观结构和机械行为.
- 评估核心高度对应力应变反应,峰值应力和能量吸收密度 (EAD) 的影响.
主要方法:
- 微结构分析包括光学显微镜,扫描电子显微镜与能量分散光谱 (SEM/EDS) 和X射线衍射 (XRD).
- 准静态压缩试验以获得应力-张力曲线并量化机械性能.
- 对具有不同核心高度 (P1至P4) 的四种配置进行分析.
主要成果:
- 应力-应变曲线呈现出不同的阶段:线性,峰值,平原和密集.
- 峰值应力范围从0.5 MPa (最厚的核心,P1) 到6.2 MPa (最薄的核心,P4).
- 能量吸收密度 (EAD) 随着应变而增加,在最薄核心的50%应变下达到≈1.113 J/cm3.
- 微结构分析揭示了AA 3000合金中的微多孔性和Fe/Mn丰富相.
- 核心高度的增加导致了较早的不稳定性,并减少了峰值应力;最薄的核心显示出优越的刚性和峰值负载.
结论:
- 核心高度显著影响形核心三明治板的机械性能.
- 较薄的核心提供更高的刚性和峰值负载能力,适用于需要渐进式应变的应用.
- 这些发现支持在需要控制能量吸收的轻质结构中使用梯形波纹.
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