EVALUATION OF CREEP LIFE FOR MAIN STEAM INTERNALLY PRESURIZED BENT PIPE CONSIDERING INITIAL OVALITY

XU Hong; NI Yong-zhong; HU San-gaoCollege of Energy and Power Engineering

doi:10.19666/j.rlfd.2009.02.010

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EVALUATION OF CREEP LIFE FOR MAIN STEAM INTERNALLY PRESURIZED BENT PIPE CONSIDERING INITIAL OVALITY

Thermal Power Generation Vol. 38, Issue 2, Pages: 37-40(2009)

更新时间：2025-09-28

- EVALUATION OF CREEP LIFE FOR MAIN STEAM INTERNALLY PRESURIZED BENT PIPE CONSIDERING INITIAL OVALITY
- 作者机构：
  
  华北电力大学能源与动力工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.2009.02.010
  CLC： TG111.8
- Published：2009
- 稿件说明：
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XU Hong, NI Yong-zhong, HU San-gaoCollege of Energy and Power Engineering. EVALUATION OF CREEP LIFE FOR MAIN STEAM INTERNALLY PRESURIZED BENT PIPE CONSIDERING INITIAL OVALITY[J]. Thermal Power Generation, 2009, 38(2): 37-40.
DOI：

XU Hong, NI Yong-zhong, HU San-gaoCollege of Energy and Power Engineering. EVALUATION OF CREEP LIFE FOR MAIN STEAM INTERNALLY PRESURIZED BENT PIPE CONSIDERING INITIAL OVALITY[J]. Thermal Power Generation, 2009, 38(2): 37-40. DOI： 10.19666/j.rlfd.2009.02.010.

摘要

主蒸汽管道中弯头部分容易失效。通过在ANSYS中嵌入蠕变连续损伤模型

利用有限元方法和三点弯曲试验方法研究了初始椭圆度和不同壁厚比对管道弯头蠕变损伤寿命的影响。有限元计算结果表明

利用骨点应力评估具有初始椭圆度管道弯头的蠕变寿命与有限元计算结果误差在3%以内。由有限元计算结果可得到内压弯管骨点的解析式

进而得到一种简便的考虑初始椭圆度的主蒸汽内压弯管的寿命评估方法。

Abstract

The bent part of main steam pipeline is easy to be failure

in order to study the creep life of bent pipe

through imbedding continuous creep demage model into ANSYS software

the influence of initial ovality and different wall-thickness ratio upon creep demage life of the pipeline has been studied.Results of finite element calculation show that the error between creep life of bent pipe in pipeline with initial ovality evaluated by using stress at skeletal point and that obtained from the result of finite element calculaton is within 3%

the analytic expression on skeletal point of bent pipe is obtained from the result of finite element calculation

thereby

a simple and easy method for evaluating the life of main steam internally pressurized bent pipe considering initial ovality can be obtained.

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