Tese: Tolerance to short crack modeling applied to the structural analysis of Hydrogen Embrittlement under H2S brine systems and high-pressure gaseous hydrogen
Aluno(a) : Rodrigo Vieira LandimOrientador(a): Marco A. Meggiolaro e Jaime Tupiassú
Área de Concentração: Mecânica Aplicada
Data: 06/05/2024
Link para tese/dissertação: https://doi.org/10.17771/PUCRio.acad.68347
Resumo: The development of new technologies with hydrogen as an energy source underscores a longstanding challenge in its transportation and storage. Since all structural materials are susceptible to hydrogen embrittlement, whether in electrochemical environments where hydrogen dissociates, adsorbs on metal surfaces, and is absorbed, under cathodic protection, or even at high hydrostatic pressures of hydrogen. The usual approach to solve this problem is to use nobler materials more resistant to hydrogen embrittlement. An alternative approach to mechanical design under hydrogen embrittlement conditions involves the modeling of the behavior of short cracks through linear elastic or elastoplastic fracture mechanics. These models consider two key material parameters: the Environmental Assisted Cracking Resistance Limit (SEAC) and the Crack Propagation Threshold in the environment, represented as KIEAC for the linear elastic case and KJIEAC for the elastoplastic case. In this study, the proposed model is validated by suitable tests under sulfide stress corrosion cracking (HSLA steel and a martensitic stainless steel UNS 41426 exposed to hydrogen sulfide), and in a 17-4PH steel exposed to high-pressure gaseous hydrogen, at 200 bar(g) (about 20MPa) of H2. A T-WOL test methodology recommended in international standards for measuring the fracture toughness at high pressure of H2 for materials with high toughness is evaluated, and it shown that it yields unsatisfactory results. As an alternative, a modified ASTM E1820 test method is proposed to obtain the JR curve under high-pressure H2, showing promising results.