Fracture Toughness of a Highly Irradiated Pressure Vessel Steel in Warm Pre-Stress Loading Conditions (WPS)
Fracture Toughness of a Highly Irradiated Pressure Vessel Steel in Warm Pre-Stress Loading Conditions (WPS)
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高辐照压力容器钢在温预应力加载条件下的断裂韧性 (WPS)
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发表时间：
2011
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影响因子：
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通讯作者：
C. Pages
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文献类型：
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作者：
G. Chas;E. Molinié;E. Garbay;Francois Cle´mendot;D. Moinereau;H. Churier;C. Pages
有缺陷结构的温预应力（WPS）发生在当其在高温下在延性域中预加载，然后冷却并加载至在脆性到延性转变温度域中断裂时。这种载荷历程是失水事故类型的反应堆压力容器意外瞬变的一个特征。对非辐照试样和结构的大量试验表明，WPS对断裂行为有良好的影响。理论上认为辐照材料也会产生WPS效应，但实验方法必须在这种条件下完成。在本文章中提出的实验方案包括在WPS加载条件下的断裂韧性测试进行两个RPV钢辐照高达6，5.1019 N/cm 2的能量密度。用于这些试验的CT12.5试样已在两个法国反应堆的压力容器监督计划的密封舱中进行了辐照。不同类型的WPS负荷历史已被应用到涵盖典型的意外瞬变。对于辐照钢，所有获得的结果都证实了通常关于WPS效应的两个假设：即使在高载荷水平下，在加载的冷却步骤期间也不会发生断裂，并且平均断裂韧性值高于常规单温试验测量的值。© 2011 ASME
The warm pre-stress (WPS) of a flawed structure occurs when it is pre-loaded at high temperature in the ductile domain then cooled and loaded up to fracture in the brittle to ductile transition temperature domain. This load history is a feature of RPV accidental transients of LOCA type. Numerous tests on non irradiated specimens and structures have shown the favourable effect of WPS on fracture behaviour. Theorical knowledge let expect that the WPS effect occurs by the same way on irradiated material, but experimental approach had to be completed in such conditions. The experimental program presented in the present article consists in fracture toughness tests under WPS loading conditions performed on two RPV steels irradiated up to a fluence of 6,5.1019 n/cm2 . The CT12.5 specimens used for these tests had been irradiated in the capsules of the pressure vessel surveillance program of two french reactors. Different types of WPS load history have been applied to cover typical accidental transients. All the results obtained confirmed for an irradiated steel the two assumptions generally made about the WPS effect: no fracture occurred during the cooling step of the loading even at high load level and the mean fracture toughness value is higher than that measured with conventional mono-temperature tests.© 2011 ASME