Multi-scale morphologically realistic models for pipeline steels

管线钢的多尺度形态真实模型

• 批准号: 566871-2021
• 负责人: Simha, Hari
• 金额: $ 1.82万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=722434
• 关键词: Multi; scale; morphologically; realistic; models

Pipelines that convey high-pressure natural gas or Carbon Dioxide may rupture and release environmentally harmful gasses into the atmosphere. Owing to the difference between the rupture propagation speed and the speed of sound in the gas, a phenomenon called "fast fracture" occurs and this can lead to the rupture propagating for several kilometers till it encounters a crack arrestor. To mitigate against this, pipelines are made from steels that are evaluated using a test wherein a heavy mass is dropped onto a notched specimen of the steel. Measurements on the specimen are then used to assess the capacity of the steel to arrest fast fractures. In this project, we proposed to develop a design framework that allows the engineering of the steels' microstructure so that the dynamic strength of the steel can arrest the rupture. Using a combination of microscopy and advanced finite element computations, we develop methods to assess potential microstructures for the capability to arrest the rupture. Instrumented nano-indentation in combination with optimization techniques is used to estimate the mechanical properties of the individual phases that constitute the steel. The latter are then used in large-scale computations to predict the mechanical behavior of the steel. The proposed framework is intended to reduce the time and effort currently expended in trial-and-error methods used for the design of steels.

输送高压天然气或二氧化碳的管道可能会破裂并将对环境有害的气体释放到大气中。由于破裂传播速度与气体中的声速之间的差异，发生了称为“快速破裂”的现象，这可以导致破裂传播数公里，直到它遇到裂纹扩展器。为了减轻这一点，管道由钢制成，使用测试来评估所述钢，其中将重物落在钢的缺口试样上。然后使用对试样的测量来评估钢阻止快速断裂的能力。在这个项目中，我们建议开发一个设计框架，允许钢的微观结构的工程，使钢的动态强度可以阻止破裂。使用显微镜和先进的有限元计算相结合，我们开发的方法来评估潜在的微观结构的能力，逮捕破裂。仪器化纳米压痕结合优化技术用于估计构成钢的各个相的机械性能。然后将后者用于大规模计算，以预测钢的机械性能。所提出的框架旨在减少目前用于钢设计的试错法所花费的时间和精力。