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首页> 外文期刊>International Journal of Pressure Vessels and Piping >Testing environmentally assisted cracking of reactor materials using pneumatic servo-controlled fracture mechanics device
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Testing environmentally assisted cracking of reactor materials using pneumatic servo-controlled fracture mechanics device

机译：使用气动伺服控制的断裂力学装置测试反应堆材料的环境辅助开裂

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摘要

The degradation mechanism, known as stress corrosion cracking or environmentally assisted cracking (EAC) has long been recognized as a major cause of failure of components and structures but the basic mechanisms of this process are not still fully understood and the development of standardized and practicable methods of testing is a key element in a strategy to understand the kinetics of failure and to provide for mitigation measures. At the JRC-IE. Institute for Energy, a new laboratory for EAC testing of nuclear power engineering materials, in particular core internals materials, has been recently commissioned. The main part of the facility consists of a pneumatic servo-controlled fracture mechanics loading system for 3-point-bending tests of fatigue pre-cracked SEN(B) specimens of different sizes, in a high temperature and pressure autoclave. A first test campaign have been carried out and focused on comparison of the results obtained on 10 X 10 X 55 and 3 X 4 X 27 mm~3 SEN(B) 316L stainless-steel specimens loaded by constant displacement rate increase tests in typical BWR conditions. The results led to determination of the influence of the loading rate on crack initiation, comparison of the results measured on different size specimens, and verification of the usability of LEFM and EPFM parameters for evaluation of the results.
机译：长期以来，人们一直认为这种降解机理（称为应力腐蚀开裂或环境辅助开裂（EAC））是导致部件和结构失效的主要原因，但该过程的基本机理仍未得到充分理解，并且还开发了标准化且可行的方法测试的了解是理解故障动力学并提供缓解措施的策略中的关键要素。在JRC-IE。能源研究所是一个新的实验室，用于对核电工程材料（特别是核心内部材料）进行EAC测试。该设备的主要部分由气动伺服控制的断裂力学加载系统组成，该系统可在高温高压高压釜中对不同尺寸的疲劳预破裂SEN（B）标本进行三点弯曲测试。进行了第一个测试活动，重点是比较在典型BWR中通过恒定位移率增加测试加载的10 X 10 X 55和3 X 4 X 27 mm〜3 SEN（B）316L不锈钢试样的结果。条件。结果导致确定加载速率对裂纹萌生的影响，比较不同尺寸试样上测量的结果，并验证LEFM和EPFM参数用于评估结果的可用性。

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