石油学报 ›› 1992, Vol. 13 ›› Issue (1): 98-107.DOI: 10.7623/syxb199201012

• 石油工程 • 上一篇    下一篇

深水海洋石油钢结构估算疲劳寿命的新的损伤力学方法

方华灿, 贾星兰   

  1. 石油大学
  • 收稿日期:1989-10-09 出版日期:1992-01-25 发布日期:2013-07-08

A NEW DAMAGE MECHANICS METHOD USED FOR ESTIMATION of the FATIGUE LIFE OF OFFSHORE PETROLEUM STEEL STRUCTURES IN DEEP WATER

Fang Huacan, Jia Xinglan   

  1. University of Petroleum, China
  • Received:1989-10-09 Online:1992-01-25 Published:2013-07-08

摘要: 在损伤力学的基础上本文提出了深水海洋石油钢结构估算疲劳寿命的新方法。文中给出了石油大学新建立的疲劳损伤数学模型。根据表面裂纹疲劳扩展试验的数据处理,提供了疲劳损伤因子的宏观测量方法。同时,还给出了海洋石油钢结构用的材料的损伤参数的决定方法。新建立的疲劳损伤数学模型得到了刚性的钢试件的疲劳试验证实;也取得了深水常用的柔性的复合材料的结构的疲劳试验验证。通过验证,本文推荐了常幅或随机载荷作用下估算疲劳全寿命的损伤力学方法及计算公式。

关键词: 深海钢材, 结构力学, 疲劳破坏, 数学模型, 海洋石油, 计算方法

Abstract: In this paper, a new method based on the theory of damage mechanics is suggested to estimate the fatigue life of offshore petroleum steel structures. A new mathematical model of fatigue damage is established and a macroseopic method of measuring fatigue damage factor based on surface crack fatigue propagation experiments at the University of pertroleum, China is developed A method of determinning material fatigue damage parameters of offshore petroleum steel structures is also provided.The fatigue damage mathematical model established has been verified not only by afatigue experiment on a rigid steel test specimen but also by the fatigue experiments of flexible compounded material structures used in deep water.The damage mechanics method and equation is recommended for whole an estimation of the fatique life under randon loading or constant amplitude loading.