Speed-dependent dynamic fracture in high strength steel pipelines

动态韧性断裂是北方高压高强度钢管道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达400 m/s。因此，研究速度相关的动态断裂，以了解裂纹速度在高压管道韧性断裂中的作用是必要的。虽然速度相关的动态断裂已被一些以前的工作的主题，其相关性和含义，在高速钢管道的动态断裂尚未得到解决。这对加拿大的管道工业提出了重大挑战。本提案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意义。该提案将特别侧重于：

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: