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Temperature and constraint effects on hydride fracture in zirconium alloys

机译：温度和约束对锆合金氢化物骨折的影响

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摘要

The fracture of hydrides in zirconium alloys is under consideration. According to the present boundary value problem, a hydride platelet lies ahead of a semi-infinite crack, along the crack plane. The surrounding material is elastic-plastic zirconium alloy. The platelet is either continuous or split into two parts, connected by a ductile matrix ligament. At distances from the crack tip, which are large compared to the hydride and the plastic zone size, the K-T field is applied and mode I, plane strain and contained yielding conditions prevail. Hydride platelet failure initiation and growth is simulated by using a de-cohesion crack growth model and the stress intensity factor, which causes fracture, is estimated at various temperatures as well as under various constraint conditions. Comparison of the calculated temperature effect on toughness with the experimental one is satisfactory. Fracture toughness decreases with T-stress. This effect is attributed to the interaction of the K-T field with hydride expansion, during precipitation. The reduction becomes more important at elevated temperatures and moderates the benefits on fracture toughness, caused by temperature increase. In addition to the detailed finite element results, analytical estimates on fracture toughness are presented, based on a cohesive zone model.
机译：锆合金中氢化物的骨折正在考虑。根据本边界值问题，氢化物血小板在沿裂缝平面的半无限裂缝之前。周围材料是弹性塑料锆合金。血小板连续或分成两部分，通过延性基质韧带连接。在与氢化物和塑料区尺寸相比大的裂缝尖端的距离处，施加K-T场，并占用的模式I，平面菌株并含有产量的条件。通过使用脱粘性裂纹生长模型和引起裂缝的应力强度因子来模拟氢化物血小板失效引发和生长在各种温度以及各种约束条件下估计骨折。对实验性韧性的计算温度效应的比较是令人满意的。断裂韧性随胁迫降低。这种效果归因于K-T场与氢化物膨胀的相互作用，沉淀过程中的氢化物膨胀。在升高的温度下，减少变得更加重要，并使由温度升高引起的断裂韧性的益处。除了详细的有限元结果之外，基于粘性区域模型，呈现了对断裂韧性的分析估计。

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