FATIGUE ASSESSMENT OF CRACK GROWTH BASED ON FAILURE ASSESSMENT DIAGRAMS FOR A SEMI-SUBMERSIBLE PLATFORM

Brodogradnja

Zhao, Shilun^1¹ 

[1] School of Civil Engineering and Transportation, South China University of Technology, Jiaotong Building 402B, South China University of Technology, Guangzhou, Guangdong 510640, China^1

关键词: Crack propagation;    Semi-submersible;    FAD;    Fracture mechanics;    Structural safety;    Offshore platform;   

DOI  :  10.21278/brod70102

学科分类：工程和技术（综合）

来源: Brodarski Institut

【 摘 要 】

This paper deals with the assessment of fatigue crack propagation on the connection between column and brace for a semi-submersible. The analysis of global and local structural responses under different sea states are performed to acquire the transfer functions of stresses. Based on an existing crack the Failure Assessment Diagrams (FAD) are applied as criterion of acceptance for the safety of crack and structure during the crack growth calculation cycle. The crack growth rate considering threshold stress intensity factor and stress ratio is used. During safety assessment the stress response from ultimate sea state is outlined. A comparison of fatigue crack growth using ultimate stress and normal stress data with different crack growth rate is presented. The results show the reliability of fatigue assessment using FAD as a measurement of acceptability of crack propagation.

【 授权许可】

CC BY