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首页> 外文会议>ASME pressure vessels and piping conference;PVP2009 >A FIRST INVESTIGATION ON CUMULATIVE FATIGUE LIFE FOR A TYPE 304-L STAINLESS STEEL USED FOR PRESSURE WATER REACTOR
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A FIRST INVESTIGATION ON CUMULATIVE FATIGUE LIFE FOR A TYPE 304-L STAINLESS STEEL USED FOR PRESSURE WATER REACTOR

机译：压力水反应器用304L不锈钢的累积疲劳寿命的初步研究

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摘要

In order to estimate the crack initiation damage, and also the water leakage conditions on PWR pipes, uniaxial fatigue curves are often used. They were deduced from strain or stress load control tests using normalised cylindrical specimens. However, severe thermo-mechanical loading fluctuations are observed in operating conditions. Components may also be submitted to transient loadings.The purpose of the present work is to start investigation on the fatigue life with a variable loading, in order to examine cumulative damage effect in fatigue. In this frame, multilevel strain controlled fatigue tests have been performed on a Type 304-L stainless steel (elaborated in accordance with the RCC-M specifications).The experimental results show that linear Miner's rule is not verified in our conditions. When the strains are applied in a decreasing order (High-Low strain sequence), the summation of cycle ratios is smaller than unity, whatever the number of applied levels, whereas this summation is higher than one for an increasing order (Low-High strain sequence). A loading sequence effect is clearly evidenced.Different cumulative fatigue damage theories, proposed in literature, have been also tested. Some of them have been given better estimation than the Miner's rule. That is the case of the so-called "Hybrid Theory" proposed and tested before by Bui Quoc on a Type 304-L steel. Extension of a model proposed by S. Taheri would seem also promising.At this stage, final conclusion cannot be yet deduced, additional investigations are needed.
机译：为了估计裂纹萌生损伤以及PWR管上的漏水情况，经常使用单轴疲劳曲线。它们是使用规范化的圆柱形试样从应变或应力载荷控制测试推导出来的。但是，在运行条件下会观察到严重的热机械负载波动。组件也可能会承受瞬时载荷。 本工作的目的是开始研究可变载荷下的疲劳寿命，以检查疲劳中的累积损伤效应。在此框架中，已经对304-L型不锈钢（根据RCC-M规范进行了详细说明）执行了多级应变控制疲劳测试。 实验结果表明，在我们的条件下线性Miner规则未得到验证。当按降序施加应变时（高-低应变序列），无论施加的水平数如何，循环比率的总和小于一，而对于递增顺序则总和大于一（低-高应变）顺序）。明显证明了加载顺序的影响。 还对文献中提出的不同的累积疲劳损伤理论进行了测试。其中一些比Miner规则得到了更好的估计。这就是Bui Quoc之前在304-L型钢上提出并测试的所谓“混合理论”的情况。塔赫里（S. Taheri）提出的模型扩展似乎也很有希望。 在此阶段，尚无法得出最终结论，需要进行其他调查。

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