Uso do critério tsai-wu para avaliação de danos em cilindros tipo iv para armazenamento de hidrogênio.

Abstract

Abstract en anglais :

"When considering the replacement of fossil fuels, hydrogen emerges as a promising clean fuel alternative. However, significant challenges arise when attempting to store it in its gaseous state. To accommodate a substantial mass of hydrogen, storage necessitates high pressures. Desired characteristics for hydrogen storage tanks include high tensile strength, low density, non-reactivity with hydrogen, and low diffusivity. High tensile strength, low density, and non-reactivity with hydrogen, together with low diffusivity, are the main desired properties for hydrogen storage tanks. Typically, cylinders are used, formed by an internal and external coating, where the exposure of the structure to great internal pressures, the possibility of degradation of some types of materials, and great structural sensitivity to the presence of internal and external damage imply the search for structural studies that can, in addition to improving the construction characteristics of the cylinders, ensure the safe storage of hydrogen. Based on their construction characteristics, the cylinders are classified as type I (totally metallic), II (metallic pressure vessels covered with carbon fiber polymer), III (metallic pressure vessels completely covered with carbon fiber polymer), IV (polymer fully coated with carbon fiber polymer), and V (composite without an inner wall). The present work will make a contribution to the evaluation of structural integrity using numerical analysis in the evaluation of possible damages that may arise in type IV cylinders, with the objective of using the Tsai-Wu criterion as a tool to analyze the structural integrity of the cylinder if the orientation of the layers of the composite material is changed with the insertion of internal damage. To carry out the work, modeling of the type IV pressure vessel, damage insertion, and numerical analysis in simulation software will be carried out to evaluate the structure in relation to the Tsai-Wu failure criterion. The aim is to develop a computational model capable of assessing the stresses experienced by the hydrogen cylinder, along with evaluating the structure’s reaction to potential internal damage. A failure will be defined in terms of rupture pressure and compared with reported experimental results using bibliographic references. It will be analyzed to see whether the simulated burst pressure shows good agreement with the results found in the literature. The results will provide a new insight into understanding the behavior of type IV cylinders under internal and external damage conditions using the Tsai-Wu criterion."