The lifetime extension of nuclear power stations is considered an energy challenge worldwide. That is why the risk analysis and the study of various effects of different factors that could potentially prevent safe long-term operation are necessary. These structures, often of great dimensions, are subjected during their life to complex loading combining varying multiaxial mechanical loads with non-zero mean values associated with temperature fluctuations under a PWR (pressure water reactor) environment. Based on more recent fatigue data (including tests at 300 °C in air and a PWR environment, etc.), some international codes (RCC-M, ASME, and others) have proposed and suggested a modification of the austenitic stainless steels fatigue curve combined with a calculation of an environmental penalty factor, namely Fen, which has to be multiplied by the usual fatigue usage factor. The determination of the field of validation of the application of this penalty factor requires obtaining experimental data. The aim of this paper is to present a new device, “FABIME2e” developed in the LISN (Laboratory of Integrity of Structures and Normalization) in collaboration with EDF (Electricity of France) and Framatome. These new tests allow the effect of a PWR environment on a disk specimen to be quantified. This new device combines structural effects such as equibiaxiality and mean strain and the environmental penalty effect with the use of a PWR environment during fatigue tests.

中文翻译：

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奥氏体不锈钢在等双轴载荷下疲劳裂纹萌生的环境影响

核电站的使用寿命延长被认为是全球范围内的能源挑战。因此，有必要进行风险分析以及研究可能会阻碍安全长期运行的不同因素的各种影响。这些结构通常尺寸很大，在它们的使用寿命中会承受复杂的载荷，这些载荷将变化的多轴机械载荷与PWR（压力水反应堆）环境下与温度波动相关的非零平均值相结合。根据最新的疲劳数据（包括在空气和压水堆环境中在300°C下的测试等），一些国际规范（RCC-M，ASME等）已提出并建议修改奥氏体不锈钢的疲劳曲线结合环境罚款因子Fen的计算，必须乘以通常的疲劳使用系数。确定该惩罚因子的验证范围需要确定实验数据。本文的目的是与EDF（法国电力）和Framatome合作，展示在LISN（结构完整性和规范化实验室）中开发的新设备“ FABIME2e”。这些新的测试可以量化PWR环境对磁盘样本的影响。这种新设备在疲劳测试期间结合了PWR环境，将等双轴性和平均应变等结构效应与环境损失效应结合在一起。本文的目的是与EDF（法国电力）和Framatome合作，展示在LISN（结构完整性和规范化实验室）中开发的新设备“ FABIME2e”。这些新的测试可以量化PWR环境对磁盘样本的影响。这种新设备在疲劳测试期间结合了PWR环境，将等双轴性和平均应变等结构效应与环境损失效应结合在一起。本文的目的是与EDF（法国电力）和Framatome合作，展示在LISN（结构完整性和规范化实验室）中开发的新设备“ FABIME2e”。这些新的测试可以量化PWR环境对磁盘样本的影响。这种新设备在疲劳测试期间结合了PWR环境，将等双轴性和平均应变等结构效应与环境损失效应结合在一起。