Numerical analysis of collapse load and specific strength for moderate-walled Ti6Al4V-laminate composite submersible vessel under external hydrostatic pressure

2nd International Workshop on Materials Science and Mechanical Engineering

机械制造;材料科学

Zhou, Y.L.^1 ; Luo, D.M.^2 ; Wang, W.X.^3

Department of Mechatronics Engineering, Foshan University, Foshan

528000, China^1

Department of Civil Engineering, Foshan University, Foshan

528000, China^2

Research Institute for Applied Mechanics, Kyushu University, 816-8580, Japan^3

关键词: Commercial software;    Elastic-Plastic;    External hydrostatic pressures;    Geometrical imperfections;    Initial imperfection;    Laminate composites;    Non-linear finite elements;    Specific strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/504/1/012063/pdf
DOI  :  10.1088/1757-899X/504/1/012063

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The effects of geometrical imperfections on the collapse load and specific strength of moderate-walled submersible vessel made of Ti6Al4V-laminate composites and Ti6Al4V alloy, respectively, have been investigated in this study. Two kinds of imperfections, which are the initial ovality along cross -section direction and the winding-induced waves along longitudinal symmetric axis, are considered. Two numerical analyses including the non-linear finite element (FE) and elastic-plastic buckling analysis are performed by the commercial software MSC Marc/Mant 2005. The obtained results indicate that initial imperfections have an obvious influence on the collapse loads of both the Ti6Al4V-laminate composite submersible vessel and the Ti6Al4V one. The collapse load is mainly governed by the elastic-plastic buckling critical load, which is conservative and safe for a vessel to bear the admissible failure load under the deepwater. Moreover, the Ti6Al4V-laminate composite submersible vessel has a better capability to resist imperfections than the Ti6Al4V one.