Inertial Impact Tests to Identify the Plastic Properties of Metals
Inertial Impact Tests to Identify the Plastic Properties of Metals
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惯性冲击测试以确定金属的塑性特性
DOI：
10.1051/epjconf/201818302051
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发表时间：
2018
影响因子：
--
通讯作者：
Davis F
中科院分区：
文献类型：
--
作者：
Davis F
与准静态响应相比，材料的行为和失效机制通常在高应变率（> 100 1/s）下发生变化。在设计将承受冲击或爆炸载荷的结构或部件时，这些差异至关重要。超高速成像和全场测量技术的最新进展为提高高应变率试验数据的质量提供了独特的机会。目前的工作的目的是设计和验证的实验技术，以确定金属的弹塑性材料特性。该方法使用超高速摄像机和网格方法获得时间分辨全场变形数据的冲击引起的应力波在样品中传播。然后使用虚拟场方法来反识别试样的塑性性能。给出了5个铝合金6082-T6在50 m/s冲击下的结果。
The behavior and failure mechanisms of materials often change at high strain rates (> 100 1/s) when compared with their quasi-static response. These differences are critical when designing structures or components that will be subjected to impact or blast loads. The recent progress in ultra-high speed imaging and full-field measurement techniques provides a unique opportunity to improve the quality of high strain rate test data. The objective of the current work is to design and validate an experimental technique to identify the elastoplastic material properties of metals. The methodology uses an ultra-high speed camera and the grid method to obtain time-resolved full-field deformation data as impact induced stress waves propagate in a sample. The virtual fields method is then used to inversely identify the plastic properties of the specimen. The results for five aluminum 6082-T6 impacted at 50 m/s are presented.