Effects of Nanostructure on Dynamic Fracture Mechanisms

动态断裂是一种重要的物理过程，它支撑着材料在许多实际应用中的使用(例如，在通过整个系统传递信息之前，即裂纹扩展和失效)。然而，材料纳米结构(晶格结构和晶格结构)对这类事件的影响还不是很清楚，例如晶界强度和晶格各向异性如何影响拉伸下的裂纹扩展和扩展。本项目的目的是识别和研究材料微观结构与高应变率下动态断裂响应之间的相关性。特别是，它可能会包括将多晶金属与非晶态玻璃进行比较。该项目将使用最近开发的高速加载技术进行仔细的实验，并得到一系列诊断仪器的支持(尽管我们预计将以较低的速率开发一系列类似的、免费的测试)。该项目是长期工业合作的一部分，将与相关的数值模拟工作密切合作。

Dynamic fracture is an important physical process that underpins the use of materials in many real-world applications (i.e. crack propagation and failure, before information is communicated through the complete system). However, the effect of material nanostructure (both lattice and grain structure) on such events is not well understood; for example how inter-grain boundary strength and lattice anisotropy influence crack propagation and growth under tension.The aim of this project is to identify and study correlations between material microstructure and dynamic fracture response at high strain rates. In particular, it will likely include comparing polycrystalline metals with amorphous glasses. The project will involve careful experiments using a recently developed high-rate loading technique, supported by a range of diagnostic instrumentation (although we expect to develop a range of similar, complimentary tests at lower rates). The project is part of a longstanding industrial collaboration, and will be performed in close co-operation with related numerical modelling efforts.