Fracture Analysis for Torsion Problems of a Deep Sea Spar Platform Main Body

[摘要] Attention should be paid to variations of crack effects on the stability of offshore structure during building and using. The body of the deep-water Spar platform is the important support of the whole structure, once produced edge cracks in certain parts, the overall structure of the platform would be severely affected. By using boundary integral equations which applied to the edge cracks of the cylinder, this paper discussed singularity of the crack tip; then used the boundary element numerical calculation method to divide the crack boundary into many units, used different interpolation functions to calculate the stress intensity factor of crack tip; Finally, calculated torsional fracture of spar platform with edge cracks under different wind loads, got the allowed maximum crack length of Spar's body with cracks under different wind scale. It was concluded that used the boundary element calculation method was practical in ocean engineering.

[发布机构] School of Transportation Civil Engineering, Shandong Jiaotong University, China^1;Branch of Water Administration Supervision, Jinan, China^2

[效力级别] 机械制造

[关键词] Crack boundaries;Crack length;Edge cracks;Fracture analysis;Interpolation function;Main bodies;Numerical calculation methods;Torsion problems