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Fracture failure analysis and structure improvement on thread joint of turbine shaft

机译：汽轮机轴线接头断裂破坏分析及结构改进

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摘要

Macroscopic and microscopic analysis of the fracture of turbine shaft joint was carried out in this paper. A number of groups of tensile and impact tests have been done after fracture sampling, the stress-strain curve and impact toughness curves of fracture materials are obtained, and the mechanical properties of turbine shaft materials are further tested. The microscopic analysis shows that the fracture surface is mainly distributed with a lot of quasi-cleavages, indicating that the material of turbine shaft is mainly brittle. In addition, establish a full-structure finite element analysis model of three-dimensional of thread joint to fit the various load conditions in the borehole accurately. In order to improve its torsion, tension and bending resistance, this paper improves the conventional American Petroleum Institute standard thread and proposes a double-shoulder structure thread. It is also found that the maximum stress value of double-shoulder thread is lower than that before the improvement. Comprehensive analysis shows that fracture of turbine shaft joint caused by structural design and material defects.
机译：本文进行了涡轮轴接头骨折的宏观和微观分析。已经在断裂采样后完成了许多抗拉和冲击试验，获得了裂缝材料的应力 - 应变曲线和抗冲韧性曲线，并且进一步测试了涡轮轴材料的机械性能。显微镜分析表明，裂缝表面主要用大量的准切割分布，表明涡轮轴的材料主要是脆性的。此外，建立三维线圈的全结构有限元分析模型，精确地拟合钻孔中的各种负载条件。为了提高其扭转，张力和弯曲性，本文改善了传统的美国石油研究所标准螺纹，并提出了双肩结构螺纹。还发现双肩螺纹的最大应力值低于改进前的最大应力值。综合分析表明，由结构设计和材料缺陷引起的涡轮轴关节骨折。

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  • 来源
    《Engineering failure analysis》 |2020年第1期|共20页
  • 作者

    Liu Yang; Lian Zhanghua; Liu Shaohu; Luo Tong;

  • 作者单位

    Southwest Petr Univ State Key Lab Oil &

    Gas Reservoir Geol &

    Exploita Chengdu 610500 Peoples R China;

    Southwest Petr Univ State Key Lab Oil &

    Gas Reservoir Geol &

    Exploita Chengdu 610500 Peoples R China;

    Southwest Petr Univ State Key Lab Oil &

    Gas Reservoir Geol &

    Exploita Chengdu 610500 Peoples R China;

    Southwest Petr Univ State Key Lab Oil &

    Gas Reservoir Geol &

    Exploita Chengdu 610500 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程力学;
  • 关键词

    Turbine shaft; Fracture; Thread; Material; Improvement;

    机译：涡轮轴;骨折;螺纹;材料;改进;

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