Three-dimensional effects influencing failure in bend-free, variable stiffness composite pressure vessels

Abstract Pressure vessels enable liquids and gases to be stored transported safely, finding pervasive use in many industries. These types of structure can manufactured into different shapes from various materials satisfy the requirements their specific applications. Maximum allowable pressure is an important factor that should considered carefully design process. Bend-free vessels, are enabled by variable stiffness composite designs, even out in-plane stress distributions through-thickness direction thereby increasing overall load carrying capacity often accompanied significant weight reduction. therefore possible candidates for next generation it study failure performance, driven safety reasons. In this study, maximum internal determined bend-free ellipsoidal exploiting properties , using first-ply based on both Tsai-Wu recently proposed three-dimensional invariant-based criteria with performance subsequently compared against conventional constant stiffness, vessels. Parametric studies then performed provide physical insight also evaluate effect material difference prediction found these criteria.