摘要
多层包扎式高压容器的研究,以往主要集中于探索其作为静态设备时能否满足强度及使用需求。随着生产需求的不断发展,该类容器逐渐应用于高压疲劳工况,其在疲劳工况下的设计也日益凸显重要性。本文考虑了层板间非焊接区域的摩擦接触,采用有限元分析方法,并依据各项权威标准,对容器在疲劳载荷下的应力情况展开深入研究,同时基于结构应力法和断裂力学方法对设备进行了疲劳评估,结果表明,端部焊接区域存在应力集中现象,这显著降低了设备的疲劳寿命,最小疲劳循环次数为39648。本文还采用了一种新型的端部锻件结构,该结构能够减少端部焊接密集区在内压作用下的应力水平,从而增加了设备的疲劳寿命,最小疲劳循环次数为4.10×105。
Previous studies on the multilayer clamping high pressure vessel primarily focused on exploring whether it could meet the strength and usage requirements as a static device.However,with the continuous development of production demands,the multilayer clamping high pressure vessel has gradually been employed in high-pressure fatigue conditions,making its design under fatigue conditions increasingly important.To address this,this study considered the frictional contact between non-welded areas of layers,employing finite element analysis methods,and conducted an in-depth study on the stress conditions of the weld area under fatigue loads according to various authoritative standards.Based on structural stress methods and fracture mechanics,the welding joint was subjected to fatigue assessment.The results indicated the presence of stress concentration in the weld area at the end section,significantly reducing the equipment's fatigue life,with a minimum life of 39648 cycles.Subsequently,this study proposed a new structure,which could reduce the stress levels in the welding-intensive area at the end section under internal pressure.In the new structure,the additional bending moment and part of the axial load in the discontinuous region of the end will have to be borne by the integral forging.This has significantly increased the equipment's fatigue life,with a minimum life of 4.10×105 cycles.
作者
肖正衍
王学生
苏智彬
王洋
陈琴珠
XIAO Zhengyan;WANG Xuesheng;SU Zhibin;WANG Yang;CHEN Qinzhu(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Boiler Works Co.Ltd,Shanghai 200245,China)
出处
《华东理工大学学报(自然科学版)》
北大核心
2025年第5期713-721,共9页
Journal of East China University of Science and Technology
关键词
多层包扎容器
疲劳评定
EN13445
疲劳裂纹扩展
热点应力
multilayer clamping high pressure vessels
fatigue analysis
EN13445
fatigue crack propagation
hot spot stress
