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首页> 外文会议>International conference on structural mechanics in reactor technology >Determination of Critical Cavity Growth Parameters for Ductile Rupture Initiation in Piping Material of PHWR
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Determination of Critical Cavity Growth Parameters for Ductile Rupture Initiation in Piping Material of PHWR

机译：水韧带牙腔生长参数的临界腔生长参数在PHWR管道材料中的临界腔生长参数

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The aim of this work was to investigate the effect of specimen geometry on ductile fracture of a low inclusion content carbon steel SA333 Gr.6 which is used as the material of Primary Heat Transport (PHT) system of Indian PHWR and to determine the critical parameter to characterise the ductile fracture initiation. Uniaxial tensile tests were conducted at room temperature on axisymmetric notched tensile specimens. Geometry effects were studied using specimens with various notch root radii, thus inducing different stress triaxiality levels. Results show that ductility is reduced for specimens with sharp notches. In order to predict rupture initiation, two different types of models are used. The first one is based on critical cavity growth (Rice & Tracey's cavity growth model and Budiansky & coll.'s model). The other model is based on the combined effect of damage and yielding (Tai & Yang's and modified Tai & Yang's model). An in-house Elasto-Plastic finite element code THESIS has been modified and used for the analysis of the notched tensile specimens. It was observed that the critical values of parameters of all the models except Budiansky & coll.'s model are weak functions of stress triaxiality.
机译：这项工作的目的是探讨试样几何形状对低包含含量碳钢SA333 GR的延性骨折的影响，该碳钢SA333 GR.6用作印度PHWR的主要热传输（PHT）系统的材料，并确定关键参数表征韧性骨折开始。在室温下在轴对称切口拉伸试样上进行单轴拉伸试验。使用具有各种缺口根半径的样品研究几何效应，从而诱导不同的应力三轴性水平。结果表明，具有尖锐槽口的标本降低了延展性。为了预测破裂启动，使用两种不同类型的模型。第一个是基于临界腔生长（水稻和灰色的腔生长模型和Budiansky＆Coll。的模型）。另一种模型基于损坏和屈服的综合影响（泰杨和修改的Tai yang的模型）。内部弹性塑料有限元码报道已被修改并用于分析缺口拉伸样品。观察到除Budiansky＆Coll的所有模型的参数的临界值。的模型是压力三轴的弱功能。

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