• Khan, Asghar
• Waqas, Hafiz Muhammad
• Uddin, Muqeem
• Tong, Lili
• Shi, Dongyan
• Imran, Muhammad

Abstract

<jats:p>This paper describes an optimization study of a spherical composite submersible pressure hull employing a genetic algorithm (GA) in ANSYS. A total of five lay-up arrangements were optimized for three unidirectional composites carbon/epoxy, glass/epoxy, and boron/epoxy. The minimization of the buoyancy factor(B . F)was selected as the design optimization objective. The Tsai-Wu and Tsai-Hill failure criteria and buckling strength factor( λ )were used as the material failure and instability constraints. To determine the effect of geometric non-linearity and imperfections on the optimized design, a non-linear buckling analysis was also carried out for one selected optimized design in ABAQUS. The non-linear buckling analysis was carried out using the modified RIKS procedure, in which the imperfection size changed from 1 to 10 mm. A maximum decrease of 65.937% in buoyancy factor(B . F)over an equivalent spherical steel pressure hull was computed for carbon/epoxy. Moreover, carbon/epoxy displayed larger decreases in buoyancy factor(B . F)in the case of 4 out of a total of 5 lay-up arrangements. The collapse depth decreased from 517.95 m to 412.596 m for a 5 mm lowest mode imperfection. Similarly, the collapse depth decreased from 522.39 m to 315.6018 for a 5 mm worst mode imperfection.</jats:p>

Topics

• Carbon
• glass
• glass
• strength
• steel
• composite
• Boron