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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.7: Operations, Applications, and Components >MODELLING OF IRRADIATION EMBRITTLEMENT IN THE DUCTILE TO BRITTLE TRANSITION RANGE FOR AN A508 PRESSURE VESSEL STEEL
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MODELLING OF IRRADIATION EMBRITTLEMENT IN THE DUCTILE TO BRITTLE TRANSITION RANGE FOR AN A508 PRESSURE VESSEL STEEL

机译：A508压力容器钢在脆性到脆性转变范围内的辐照脆化模型

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摘要

The aging behavior of structural steels used to manufacture nuclear pressure vessels is surveyed using Charpy V-notch specimens located in capsules inside the pressure vessel. The Charpy data are then used to assess the safety integrity of the structures based on semi-empirical relations relating Charpy impact transition curve shifts and the fracture toughness shifts due to irradiation. Using a computational strategy proposed in [1] which combines a deterministic model for ductile fracture and a statistical description of brittle fracture, this work aims at the prediction of the whole Charpy transition curve of irradiated steels. The actual strain hardening behavior of an A508 C1.3 steel from the french surveillance program is considered in the simulations, contrarily to a previous work where a shift of the un-irradiated stress-strain curve to higher stress values was considered. Comparison with Charpy energy data for two levels of irradiation shows that irradiation possibly also affect brittle fracture. It is also shown that if a low increase of the yield stress is considered, the ductile fracture energy can decrease as a result of a compensation between the increase of dissipated energy due to a higher yield stress and a decrease of dissipated energy due to a faster ductile crack propagation.
机译：用于制造核压力容器的结构钢的时效行为是通过位于压力容器内部的胶囊中的夏比V型缺口样品进行调查的。然后，将夏比数据用于基于夏比冲击过渡曲线位移和辐照引起的断裂韧性位移的半经验关系来评估结构的安全完整性。利用在文献[1]中提出的计算策略，该方法将韧性断裂的确定性模型与脆性断裂的统计描述相结合，旨在预测辐照钢的整个夏比转变曲线。在模拟中考虑了来自法国监视程序的A508 C1.3钢的实际应变硬化行为，这与先前的工作相反，之前的工作考虑了未辐照应力-应变曲线向较高应力值的偏移。与夏比能量数据在两个辐射水平上的比较表明，辐射可能还会影响脆性断裂。还显示出，如果考虑屈服应力的较低增加，则由于较高的屈服应力导致的耗散能量的增加与较快的应力导致的耗散能量的减少之间的补偿，延性断裂能会降低。韧性裂纹扩展。

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