Analytical solution for crack growthing of semi-submersible platform's horizontal brace

The article presents an analytical solution to calculate the crack growth characteristics of semi-submersible platform's horizontal brace with a circumferential through-crack lies at the boundary between the horizontal brace and column loaded by tension. the results of the proposed model may be applied in the full range of fracture from stationary crack to plastic collapse and the solution process is clear and the analytical solution is found which is especially suitable to solve problems in practical engineering application. the analysis results indicate that the crack tip opening displacement (ctod) on the cracked section increases smoothly when loaded with small tension but increases sharply when loaded with larger tensions. furthermore,the crack initiation load and the ultimate load vary dramatically with the initial angles and yield stress compared with critical ctod,critical ctoa and young's modulus.