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Elastic-Plastic Analysis of the Transition Divertor Joint for High Performance Divertor Target Plate

机译：高性能分流器目标板过渡分流器接头的弹塑性分析

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摘要

The use of tungsten as a plasma-facing material necessitates a transition joint to the structural material of the primary coolant loop at some location in order to transport the coolant to the heat exchanger. A critical issue in transition joints is the thermal expansion mismatch between materials, which can lead to unacceptably high thermal stresses. Detailed 2D and 3D analyses were performed to study the behavior of a transition from tungsten to ferritic steel (FS) with an intermediate layer of tantalum, located outside of the high heat flux region. This thesis describes the results of FEM analyses including primary and secondary stresses under various time-dependent loading conditions such as warm and cold shutdown, and allowing for inelastic behaviors leading to stress relaxation and ratcheting.;In previous FEM analyses at UCLA, it was concluded the residual stress in Ta exceeds the ultimate and tensile strength. In such configuration that is under high pressure and temperature loading conditions, plastic deformation has to be considered during the analysis. It also causes stress relaxation on the configuration.;The results exhibited that the original transition joint did not satisfy the design requirement on maximum accumulated plastic principal strain due to stress concentration. Some modifications were made on the transition joint. Fabrication steps were analyzed in 2D models utilizing ANSYS. The results of the modified design exhibited less plastic deformation in Ta alloy and ODS steel as well as no ratcheting in cold shutdown. Both 2D and 3D cold and warm shutdown were analyzed as well.
机译：使用钨作为面向等离子体的材料需要在某个位置过渡到主冷却剂回路的结构材料，以便将冷却剂输送到热交换器。过渡接头中的一个关键问题是材料之间的热膨胀失配，这可能导致不可接受的高热应力。进行了详细的2D和3D分析，以研究从钨到高热通量区域外部的中间层钽的铁素体钢（FS）的转变行为。本文描述了有限元分析的结果，包括在不同时间依赖的载荷条件下的主应力和次应力，如热和冷关闭，并允许非弹性行为导致应力松弛和棘轮。 Ta中的残余应力超过极限强度和拉伸强度。在处于高压和高温负荷条件下的这种配置中，必须在分析过程中考虑塑性变形。结果表明，由于应力集中，原始的过渡缝不能满足最大累积塑性主应变的设计要求。对过渡接头进行了一些修改。利用ANSYS在2D模型中分析了制造步骤。修改后的设计结果表明，Ta合金和ODS钢的塑性变形较小，冷关断时也没有棘齿。还分析了2D和3D冷关机和暖关机。

著录项

  • 作者

    Navaei, Dara.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Mechanical engineering.
  • 学位 M.S.
  • 年度 2011
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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