Correction of microstructural aberrations in Neutron Diffraction strain measurements in power plant structures

发电厂结构中子衍射应变测量中微观结构像差的校正

• 批准号: 2621984
• 金额: --
• 依托单位: The Open University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2621984
• 关键词: Correction; microstructural; aberrations; Neutron; Diffraction

Residual stress characterisation is an essential aspect of structural integrity assesment. Conducting residual stress characterisation using the Neutron diffraction technique is very desirable, however, the complex structures present in nuclear power plant components make this process fraught with errors. Here the proposed project will use Monte Carlo ray tracing simulations of the neutron diffraction technique to predict the errors induced by typical microstructural features present in power plant components, such as welds and cladding. Models will be constructed using the McStas ray tracing code and validated using measurements made at neutron diffraction facilities. This will culminate in validated simulation capabilities driven by EBSD or tomography data of actual components to correct residual stress maps produced by the neutron diffraction techniques. Reducing the uncertainty of residual stress data is a key stepping stone in improving safety assessments.

残余应力表征是结构完整性评估的一个重要方面。使用中子衍射技术进行残余应力表征是非常理想的，然而，核电站部件中存在的复杂结构使得该过程充满错误。在这里，拟议的项目将使用中子衍射技术的蒙特卡罗射线追踪模拟来预测发电厂部件（例如焊缝和包壳）中存在的典型微观结构特征引起的误差。模型将使用 McStas 射线追踪代码构建，并使用中子衍射设施的测量进行验证。这将最终形成由实际组件的 EBSD 或断层扫描数据驱动的经过验证的模拟功能，以校正中子衍射技术产生的残余应力图。降低残余应力数据的不确定性是改进安全评估的关键基石。