内压载荷下X80管道裂纹应力分布规律研究

为了研究内压作用下管道裂纹应力场分布规律,以含有表面裂纹的X80管道为研究对象,对不同形状、不同方向、不同内压、不同尺寸的含裂纹管道进行仿真分析和实验验证。结果表明:裂纹尖端处应力远大于裂纹中心应力。裂纹形状对应力影响作用较小,随着裂纹方向与管道轴向夹角增大,裂纹尖端应力先增大后减小,随着管道内压、裂纹深度、裂纹长度的增大,裂纹尖端处应力随之线性增大。其中,裂纹长度对裂纹尖端应力的影响小于管道内压和裂纹深度。

Research on Stress Distribution of X80 Pipeline Crack Under Internal Pressure Load

In order to study the distribution law of stress field of pipeline cracks under internal pressure,this paper takes X80 pipeline with surface cracks as the research object,simulation analysis and experimental verification for pipelines with cracks of different shapes,directions,internal pressures and sizes were carried out.The results show that the stress at the crack tip is much greater than that at the crack center.Crack shape has little effect on stress.With the increase of the angle between crack direction and pipeline axis,the stress at crack tip first increases and then decreases.With the increase of pipeline internal pressure,crack depth and crack length,the stress at crack tip increases linearly.The effect of crack length on crack tip stress is less than that of internal pressure and crack depth.