管节点国产化疲劳性能的试验研究

Experimental research of homemade tubular joint on fatigue property

介绍了国产海洋用钢（Ｚ向钢）焊接Ｔ型管节点疲劳试验的过程和成果．试验对Ｔ型管节点的应力集中系数、应力分布、疲劳寿命及裂纹扩展进行了详细测量，经过分析得到Ｔ型管节点实测应力集中系数的经验公式、疲劳Ｓ－Ｎ曲线及裂纹扩展规律．试验结果表明国产Ｚ向钢、国内焊接工艺和加工制造的焊接管结点有较好的疲劳性能，为我国海上平台国产化提供了依据．

This paper intreduces the process and result of fatigue test of steel(Z direction steel)welded T tubular joints used in offshore engineering.Detailed measurelnent of stress concentration fac-tor,stress distribution ,fatigue life and crack development has been performed. Through analysis,an empirical formula of stress concentration factor for T tubular joints, fatigue S-N curve and crack propagation rule are obtained.