摘要
基于线性波浪理论计算作用于海洋立管上的波浪力,建立含外表面轴向裂纹海洋立管的有限元模型,采用ANSYS有限元软件计算含不同尺寸裂纹的海洋立管在内压和波浪力共同作用下的疲劳寿命,分析海洋立管的疲劳寿命随裂纹几何参数的变化规律.计算与分析结果表明:裂纹长度和裂纹深度的增加都会使海洋立管的疲劳寿命减小,但裂纹深度对海洋立管疲劳寿命的影响远大于裂纹长度;裂纹深度较小时,海洋立管疲劳寿命随裂纹深度的增加而急剧减小;对于同一深度的裂纹,裂纹椭圆率越大,海洋立管的疲劳寿命越大;总之,海洋立管的疲劳寿命主要取决于裂纹深度.
The wave force acting on marine riser was calculated based on the linear wave theory.The finite element model of marine riser with axial crack on outside surface was established,and then the fatigue life of marine riser with crack of different dimensions under combined action of internal pressure and wave force were calculated by the ANSYS finite element software.Variation of fatigue life of marine riser with geometry parameters of crack had been analyzed.The calculation and analysis results showed that：the fatigue life of marine riser reduced with the increase of crack length and crack depth,but the crack depth had much more effect on the fatigue life of marine riser than the crack length.When the crack depth was smaller,the fatigue life of marine riser decreased with the increase of crack depth more rapidly.For the same crack depth,crack ellipticity was the larger,the fatigue life of marine riser was the lager.In short,the fatigue life of marine riser mainly depended on the size of crack depth.
出处
《兰州理工大学学报》
CAS
北大核心
2014年第1期59-63,共5页
Journal of Lanzhou University of Technology
基金
国家质检公益基金(201210026)
