Speed-dependent dynamic fracture in high strength steel pipelines

动态韧性断裂是北方高压高强钢管线设计和选材中的一个重要课题。高压下管道的韧性断裂速度可高达400 m/s。因此，有必要开展速度相关的动态断裂研究，以了解裂纹速度在高压管道韧性断裂中的作用。虽然速度相关的动态断裂已经成为一些先前工作的主题，但其与高速钢管道动态断裂的相关性和意义尚未得到解决。这给加拿大的管道行业带来了重大挑战。本研究旨在探讨速度敏感动态韧性断裂的潜在机制及其对高速钢管道设计的启示。这项建议将特别侧重于：

Dynamic ductile fracture is an important topic in the design and material selection of higher-pressure Northern pipelines made of high strength steel (HSS). The speed of ductile fracture of pipelines under high pressure could be as high as 400 m/s. Therefore, the investigation of speed-dependent dynamic fracture is required to understand the role of crack speed in ductile fracture of high-pressured pipelines. Although speed-dependent dynamic fracture has been the topic of some previous works, its relevance and implication to dynamic fracture in HSS pipelines have not yet been addressed. This has raised a major challenge to Canada's pipeline industries. The present proposal aims to explore the underlying mechanism of speed-sensitive dynamic ductile fracture and its implication to HSS pipeline designs. This proposal will particularly focus on: