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首页> 外文期刊>Engineering Fracture Mechanics >Fracture mechanics analysis of Zircaloy-4 tubular samples after laboratory simulated LOCA transient
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Fracture mechanics analysis of Zircaloy-4 tubular samples after laboratory simulated LOCA transient

机译：实验室模拟LOCA瞬态后锆铝 - 4个管状样品的断裂力学分析

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摘要

This paper investigates the room temperature cladding embrittlement of Stress Relieved Annealed (SRA) Zircaloy-4 fuel cladding samples subjected to laboratory steam oxidation tests simulating Loss of Coolant Accident (LOCA) transients at 1 200 degrees C followed by water quenching. These high temperature oxidized tubes are mechanically tested using axial tensile samples with machined gage sections. Formerly performed studies suggested that Linear Elastic Fracture Mechanics (LEFM) could provide a good understanding of the sample failure process, including crack nucleation close to the oxidized surfaces followed by crack instability and sample failure at higher applied loads. However, it was found that when the applied stress intensity was calculated using solutions for plate material given in the Tada and Paris Handbook, with the cracks in the plate corresponding to a crack formed only on the cladding's outer surface - produced by oxidation on this surface alone - versus two opposing cracks formed on the cladding's inner and outer surfaces - produced by oxidation on both of these surfaces - the critical stress intensity was different between these two cases. It is shown here that for both of the foregoing configurations the same critical crack intensity values are obtained when the applied LEFM stress intensity values are calculated using three dimensional finite element modeling of the axial tensile samples. The critical stress intensity factors determined by this more accurate method - and calculated as a function of degree of surface oxidation and hydrogen content in the prior-beta phase could, thus be considered to be a true materials parameter correlating well with the experimentally determined effect of hydrogen content on the failure strength of the samples.
机译：本文调查了放缓的压力覆盖脆化（SRA）Zircaloy-4燃料包覆样品对实验室蒸汽氧化试验的燃料包覆样品，其在1 200摄氏度下模拟冷却剂事故（LOCA）瞬变的损失，然后进行水猝灭。这些高温氧化管采用轴向拉伸样品，采用加工量具部分地进行机械测试。以前进行的研究表明，线性弹性骨折力学（甲烯）可以良好地理解样品失效过程，包括靠近氧化表面的裂纹成核，然后在较高施加的载荷下裂纹不稳定和样品失效。然而，发现当使用TADA和巴黎手册中给出的板材解决方案计算施加的应力强度时，用裂缝对应于仅在覆层的外表面上形成的裂缝 - 通过氧化在该表面上产生的裂缝单独 - 与覆层的内表面上形成的两个相对的裂缝 - 通过氧化在这两个表面上产生 - 这两种情况之间的临界应力强度不同。这里示出了，对于使用轴向拉伸样品的三维有限元建模计算所施加的lefm应力强度值，可以获得相同的临界裂缝强度值。通过这种更准确的方法决定的临界应力强度因子 - 并且作为表面氧化程度的函数和先前β相中的氢含量，因此被认为是具有实验确定的效果的真实材料参数良好样品失效强度的氢含量。

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