Welded joints behaviour in high temperature reactors

高温反应堆中的焊接接头行为

• 批准号: 2891486
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2891486
• 关键词: Welded; joints; behaviour; temperature; reactors

Welded joints are one of most safety critical locations in a reactor structure. They are often prone to damage after decades of operation and can be considered to be one of the life-limiting factors in the UK's advanced gas cooled reactors. This is because of the complexities involved in a weld including the residuals stress, varying microstructure and their complicated geometry. The aim of this project is to identify the criticality of the stress concentration created at the interface of a welded joint through advanced experimental techniques such as Digital Image Correlation and synchrotron X-ray diffraction. The experimental work is expected to be complemented by finite element simulations to assess the severity of the creep damage accumulated at the weld interface. Critically, the key results are expected to be included in the integrity assessment procedures the engineers use day to day to evaluate the fitness for service of reactor components.

焊接接头是反应堆结构中最关键的安全位置之一。它们在运行数十年后往往容易损坏，可以被认为是英国先进气冷反应堆的寿命限制因素之一。这是因为焊接涉及的复杂性，包括残余应力、变化的微观结构和复杂的几何形状。该项目的目的是通过先进的实验技术，如数字图像相关和同步辐射X射线衍射，以确定在焊接接头的界面处产生的应力集中的临界性。预计实验工作将通过有限元模拟来补充，以评估焊接界面处累积的蠕变损伤的严重程度。关键的是，关键的结果预计将包括在完整性评估程序，工程师使用日常评估反应堆组件的服务的适合性。