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现场测量受冲击的中损伤演变的现场测量,作为微观结构的函数

Brianna MacNider¹, David Jones², Jesse Callanan²

¹Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.

Science advances

|November 10, 2023

概括

这项研究使用高分辨率成像可视化金属中的动态损伤,揭示了空洞进化如何取决于时间和微观结构,以改进材料建模.

科学领域:

材料科学材料科学材料科学
机械工程机械工程
物理物理学物理

背景情况:

在动态负载下预测物质损坏是具有挑战性的,因为有限的时间解决的实验数据.
现有的分析模型通常需要简化假设,阻碍准确性.

研究的目的:

直接观察和分析金属中螺纹损伤的依赖时间的演变.
提供高分辨率的现场数据,用于验证和改进动态损坏模型.

主要方法:

利用吸收对比成像用于直接可视化.
实现了大约1.6μm的空间分辨率以捕捉细节.
在动态加载过程中记录空隙核和增长的时间解析数据.

主要成果:

用前所未有的细节观察了损伤的时间演变.
确定空隙分布和大小在时间和物质微观结构上的明显依赖.
产生了关键数据,以了解动态材料故障机制.

结论:

直接的高分辨率成像为动态损伤过程提供了关键的见解.
这些发现使物质损害计算模型的验证和增强成为可能.
这项研究为设计先进的抗损坏材料铺平了道路.

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