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首页> 外文期刊>Engineering Fracture Mechanics >Intergranular mechanical behavior in a blade groove-like component by crystal plasticity model with cohesive zone model
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Intergranular mechanical behavior in a blade groove-like component by crystal plasticity model with cohesive zone model

机译：用粘性区模型晶体塑性模型叶片槽状成分中的晶间机械行为

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Creep-induced intergranular mechanical behavior was investigated in the first blade groove-like component on a steam turbine rotor. The involved method combined the crystal plasticity constitutive model with the cohesive zone model, to describe the stress-strain behavior inside the material’s grains and to model the traction-separation responses at the grain boundaries, respectively. Three displacement-drive FE submodels of the blade groove-like component were established to explore the effects of cohesive elements and predefined initial cracks. It was found that the cohesive elements relieved the stress concentration and eased the effects of material heterogeneity among the grains. With predefined initial cracks, the grain boundaries around the fillet surface were more greatly deformed to satisfy the overall displacement compatibility. The grain boundaries far inside of the blade groove, however, were extruded due to the bending behavior of the blade groove. Analysis of the overall intergranular mechanical behavior confirmed the long-term inhibitory effect of the initial cracks on further cracking.
机译：在蒸汽轮机转子上的第一叶片槽状部件中研究了蠕变诱导的晶间机械行为。所涉及的方法将晶体塑性本构模型与粘性区模型组合，描述了材料晶粒内的应力 - 应变行为，并分别模拟了晶界处的牵引分离响应。建立了三个位移 - 驱动器的叶片状部件的Fe子模型，以探讨粘性元件和预定义的初始裂缝的影响。发现粘性元件减轻了应力浓度并减轻了晶粒之间材料异质性的影响。利用预定义的初始裂缝，圆角表面周围的晶界更大地变形以满足整体位移兼容性。然而，由于叶片槽的弯曲行为，叶片槽内部的晶界。对整体晶间机械行为的分析证实了初始裂缝对进一步开裂的长期抑制作用。

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