Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analysis of mesh types applied to the numerical modeling of a composite overwrapped pressure vessel
Submission Author:
Lucas Agne , RS
Co-Authors:
Lucas Agne, Estêvão Santos Laureano da Cunha, Henrique R. Mença, Sandro Amico, Maikson Luiz Passaia Tonatto
Presenter: Lucas Agne
doi://10.26678/ABCM.COBEM2023.COB2023-0198
Abstract
Composite overwrapped pressure vessels (COPV) are lightweight structures primarily constituted by a liner and composite overwrap. These COPV may be used for storing compressed natural gas (CNG) for onboard applications, typically working in up to 20 MPa of pressure. Improper designing of cylinders can lead to catastrophic accidents, and numerical simulation is used as a tool to minimize such issues and contribute to a better understanding of the mechanical response of these structures under internal pressure. It is known that the choice of layup of composite layers impacts in several aspects like stress vs strain and failure behavior along with the final burst pressure, but their understanding is still unclear. This work investigates the burst pressure of COPVs using finite element analysis (FEA) for models built using four different mesh types: axisymmetric continuum, axisymmetric shell, 3D continuum e 3D shell with a quarter of symmetry. First, the methodology developed based on the bibliographic review was used to simulate some results from the literature, in order to validate the simulation using boundary conditions and loadings related to a CNG application. Then, the liner was modeled in Abaqus in two types of modeling, 3D and axisymmetric, to be able to import the different types of mesh generated for the composite. After, a netting analysis is performed in order to obtain an initial estimate of the number of layers, being required a burst pressure of 47 MPa, and Clairaut's equation is used to determine the minimum winding angle to have no-slip. Posteriorly, it is created layup sequence and WoundSim plug-in was used to build the composite overwrap. The analyses were performed for the operating pressure of the COPV using the Tsai-Wu, Tsai-Hill and maximum stress failure criteria. The obtained results are discussed in terms of simulation time and computational cost. Close values were obtained between the different models, and the axisymmetric model, that uses fewer elements, was validated, allowing a greater number of increments in the simulations.
Keywords
pressure vessel, Composite overwrapped, Numerical simulation, CNG application, Mesh types
