Environmental Crack Growth of Structural Materials in Pressurised Gas (ENCAMP)

压缩气体中结构材料的环境裂纹扩展 (ENCAMP)

• 批准号: 103621
• 金额: $ 36.19万
• 依托单位: JACOBS CLEAN ENERGY LIMITED
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=103621
• 关键词: Environmental; Crack; Growth; Structural; Materials

Structurally-critical components operating at high temperatures and in high pressure gaseous environments can display cracking behaviours that are not replicated using conventional mechanical testing methods which simulate the temperature but not the gas environment. Such behaviour appears to have been observed in both UK nuclear power stations and industrial gas turbines. This raises questions about using existing laboratory data for estimating the lifetime of in-service components. There is a need to confirm whether gas environment has a significant impact and develop a mechanical testing capability that better simulates these high temperature and pressure gaseous environments. This would provide a capability which is believed not to exist at any other facility world-wide, and is certainly not readily available. This project brings together a consortium of organisations to address this problem, from a user perspective and also in the provision of testing capability, with suitable instrumentation. Detailed microscopy will be undertaken to demonstrate the differences in behaviour seen between cracked ex-service components and cracks produced under current laboratory conditions. Alongside this, a facility will be designed and built to enable fatigue initiation, and fatigue and creep crack growth tests to be conducted in relevant environments for nuclear power stations and gas turbines. Initial trials in the pressurised gas facility will be undertaken to demonstrate its operation and provide an opportunity to determine the reproduction of ex-service behaviour.

在高温和高压气体环境下工作的结构关键部件可能会显示出裂纹行为，这是传统机械测试方法无法复制的，这些方法只能模拟温度而不能模拟气体环境。这种行为似乎在英国核电站和工业燃气轮机中都观察到了。这就提出了使用现有实验室数据来估计在役部件寿命的问题。需要确认气体环境是否有重大影响，并开发一种机械测试能力，以更好地模拟这些高温高压气体环境。这将提供一种能力，据信世界上任何其他设施都不具备这种能力，当然也不容易获得。这个项目汇集了一个组织联盟来解决这个问题，从用户的角度来看，也在提供测试能力，用合适的仪器。将进行详细的显微镜检查，以证明在退役部件的裂纹和在当前实验室条件下产生的裂纹之间所看到的行为差异。除此之外，还将设计和建造一个设施，以便在核电站和燃气轮机的相关环境中进行疲劳启动、疲劳和蠕变裂纹扩展试验。将对加压气体设施进行初步试验，以证明其运作，并提供机会确定退役人员行为的再现。