轴力作用下T节点焊缝周围的平均应力分布

平均应力模型法是评价海洋平台中管节点疲劳寿命的一种方法,这种方法认为节点的疲劳寿命是由热点应力幅值和焊缝周围的应力分布确定的。管节点焊缝周围应力分布通过一个平均应力分布参数AVS描述。本文研究了轴力作用下T节点的AVS大小,通过对127个不同几何参数的T节点模型的计算,调查了几何参数对AVS的影响,提出了用于计算AVS的参数方程,从而完善了传统的平均应力模型,为轴力作用下T节点的疲劳寿命计算提供了一种快速而高效的方法。

AVERAGE STRESS DISTRIBUTION ALONG THE WELD TOE FOR TUBULAR T-JOINTS SUBJECTED TO AXIAL LOAD

Average stress model method can be used to assess the fatigue life of tubular joints in offshore engineering. In this method, the fatigue life of tubular joints is thought to be determined by the hot spot stress range and the stress distribution along the weld toe. The stress distribution along the weld toe is denoted by an average stress distribution parameter, namely AVS. The AVS values of tubular joints under axial load is studied in this research, and the effect of the geometrical parameters on the AVS is investiaged through the FE analysis of 127 T-joint models. A parametric equation to calculate the AVS is presented. The conventional average stress model is refined by the AVS results and it provides a fast yet efficient method to estimate the faigue life of tubular T-joints under axial load.