A Comparative Study on the Post-Buckling Behavior of Reinforced Thermoplastic Pipes(RTPs)Under External Pressure Considering Progressive Failure  

作　　者：DING Xin-dong WANG Shu-qing LIU Wen-cheng YE Xiao-han 

机构地区：[1]College of Engineering,Ocean University of China,Qingdao 266100,China [2]Shandong Provincial Key Laboratory of Ocean Engineering,Ocean University of China,Qingdao 266100,China [3]Department of Marine Technology,Norwegian University of Science and Technology(NTNU),Trondheim NO-7491,Norway

出　　处：《China Ocean Engineering》2024年第2期233-246,共14页中国海洋工程（英文版）

基　　金：financially supported by National Natural Science Foundation of China(Grant Nos.52088102,51879249);Fundamental Research Funds for the Central Universities(Grant No.202261055)。

摘　　要：The collapse pressure is a key parameter when RTPs are applied in harsh deep-water environments.To investigate the collapse of RTPs,numerical simulations and hydrostatic pressure tests are conducted.For the numerical simulations,the eigenvalue analysis and Riks analysis are combined,in which the Hashin failure criterion and fracture energy stiffness degradation model are used to simulate the progressive failure of composites,and the“infinite”boundary conditions are applied to eliminate the boundary effects.As for the hydrostatic pressure tests,RTP specimens were placed in a hydrostatic chamber after filled with water.It has been observed that the cross-section of the middle part collapses when it reaches the maximum pressure.The collapse pressure obtained from the numerical simulations agrees well with that in the experiment.Meanwhile,the applicability of NASA SP-8007 formula on the collapse pressure prediction was also discussed.It has a relatively greater difference because of the ignorance of the progressive failure of composites.For the parametric study,it is found that RTPs have much higher first-ply-failure pressure when the winding angles are between 50°and 70°.Besides,the effect of debonding and initial ovality,and the contribution of the liner and coating are also discussed.

关 键 词：reinforced thermoplastic pipes post-buckling behavior progressive failure of composites DEBONDING initial ovality 

分 类 号：P756.2[天文地球—海洋科学]