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中国电机工程学报 2007, 27(32) 63-66 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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超(超)临界汽轮机汽缸紧固螺栓疲劳-蠕变断裂的研究 |
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徐鸿 郑善合 Maile Karl |
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华北电力大学电站设备状态监测与控制教育部重点实验室 华北电力大学电站设备状态监测与控制教育部重点实验室 斯图加特大学国家材料测试中心 |
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摘要：
调峰机组频繁调整负荷，汽轮机汽缸紧固螺栓处于疲劳-蠕变交互作用，对紧固螺栓多轴应力下疲劳-蠕变损伤的研究对调峰机组安全运行和维修具有重要意义。该文对镍基合金Nimonic 80A进行了550℃下单轴及空心螺栓的疲劳-蠕变断裂实验，应用Chaboche-Nouaihas模型，用有限元软件ABAQUS模拟了空心螺栓的疲劳-蠕变过程。结果表明，与空心螺栓的纯蠕变断裂不同，疲劳-蠕变断裂发生在应力集中的螺纹处，有限元计算结果与实验结果吻合较好。
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关键词：
超(超)临界汽轮机
紧固螺栓
疲劳-蠕变
损伤模型
断裂
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Research on the Fatigue-creep Rupture of Fastening Bolts of Ultra-supercritical Steam Turbine Cylinder Case |
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Abstract:
Loading of peak generator units were changed frequently. The fastening bolts of steam turbine cylinder case were in fatigue-creep interaction. It was important to study fatigue-creep interaction damage of fastening bolts under multiaxial stress. Fatigue-creep rupture experiments of Nimonic 80A uniaxial specimen and hollow bolts at 550°C were carried out. Fatigue-creep process was simulated by ABAQUS using Chaboche-Nouaihas fatigue creep model. It is indicated that fatigue-creep rupture of hollow bolt is different from simple creep rupture. Hollow bolt rupture of fatigue-creep is taking place at the position of the first screw thread root, where the stress is concentrated. A good coincidence comparing the result experiment with finite element calculation can be observed.
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Keywords:
ultra-supercritical steam turbine
fastening bolt
fatigue-creep
damage model
rupture
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收稿日期 2007-02-12 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 郑善合 |
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作者简介: |
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作者Email: zsh0314@126.com |
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| 参考文献： |
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| 本刊中的类似文章 |
| 1．徐鸿 郑善合 Maile Karl.超(超)临界汽轮机汽缸紧固螺栓高温蠕变断裂研究[J]. 中国电机工程学报, 2007,27(29): 80-83 |
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| Copyright by 中国电机工程学报 |
