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首页> 外文会议>ASME Pressure Vessels and Piping Division Conference >Residual Stress Finite Element Analysis and Measurements of a Tube Penetration J-Groove Attachment Weld in a Hemispherical Head of a Large Ferritic Pressure Vessel - Part I: Centre Nozzle
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Residual Stress Finite Element Analysis and Measurements of a Tube Penetration J-Groove Attachment Weld in a Hemispherical Head of a Large Ferritic Pressure Vessel - Part I: Centre Nozzle

机译：大型铁素体压容器半球头管渗透J-槽附接焊接管穿透J槽附接焊接的残余应力有限元分析。第一部分：中心喷嘴

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摘要

A programme of work was undertaken to gain an understanding of the residual stress levels in the tube penetration J-groove attachment welds in a hemispherical head of a large stainless steel clad ferritic pressure vessel. In this first part, of a two-part paper, the finite element analyses that were carried out to model the centre nozzle penetration are described. Two axisymmetric residual stress finite element models were developed. One used an accurate representation of the weld bead deposition sequence and the other a bead lumping approach to model bead deposition. The results from the finite element analyses were compared with both surface and through thickness stress measurements. These measurements were taken on a mock-up weld that was representative of the actual component. The surface measurements were taken by using an incremental centre hole drilling technique (ICHD). The through thickness values were obtained from deep hole drilling (DHD) measurements. The DHD measurements were taken before and after the cladding of the mock-up. The analytical results from the two axisymmetric models showed the simpler blocked dump model approach to be reasonable in capturing the general level of stress. The finite element analysis results showed good agreement with the measurements in the radial direction, but predicted greater than the measured values in the hoop direction.
机译：开展了一项工作计划，以了解在大型不锈钢包层铁素体压力容器的半球头中管穿透J槽附接焊缝中的残余应力水平。在该第一部分中，描述了以模拟中心喷嘴渗透的有限元分析。开发了两个轴对称残余应力有限元模型。一种用来用焊珠沉积序列的精确表示和另一个珠子拉伸方法来模拟珠子沉积。将有限元分析的结果与表面和厚度应力测量进行比较。这些测量是在代表实际组分的模拟焊缝上进行的。通过使用增量中心钻孔技术（ICHD）采取表面测量。通过深孔钻孔（DHD）测量获得通过厚度值。在模拟的包层之前和之后采取了DHD测量。来自两个轴对称模型的分析结果表明，在捕获一般压力水平方面是更简单的阻塞式转储模型方法。有限元分析结果表明径向上的测量值良好，但预测大于箍方向上的测量值。

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