Simulación numérica preliminar de la degradación por hidrógeno en tuberías de acero de alta resistencia usando elementos finitos

Abstract

DOCUMNET IN THE PROCESS OF INTELLECTUAL PROPERTY. Let's imagine a ship sailing on the high seas transporting hydrogen miles from the coast. Everything seems to be fine, when suddenly BOOM! An explosion rocks the ship. It's not a storm, nor a human error, it's an invisible, stealthy but lethal enemy - hydrogen. This gas seeps into the steel pipes, weakening them from the inside until at one point they simply collapse. But what if we could predict it before it's too late? For this reason, our project uses numerical simulations to predict the effect of hydrogen on steel pipes in order to avoid possible structural failures. Ansys 2024 R2 software was used in the static structural option, adding the "Paris Law" option through the Smart Crack Growth module in Fatigue, to analyze the influence of hydrogen using the Paris constants taken from the literature. The results obtained reflect that hydrogen affects the dislocations of the material in two ways: promoting its fixation or improving its mobility. The competition between these two roles defines whether the resulting phenomenon increases or decreases the strength from the point of view of fatigue crack growth of the material. Keywords: Fatigue, Paris Law, Dislocations, Fixation, Mobility