Numerical analysis EF of resilience impact test behavior for X80 steel

The X80 is indeed a high-strength material widely used in the industry, particularly in the construction of pipelines for the transportation of natural gas. The term “X80” generally refers to the minimum tensile strength of the material, which is approximately 550 MPa. This means that the X80 material can withstand significant loads while maintaining its structural integrity. Its demand has increased due to its utility in numerous applications where fracture resistance is crucial, making it a preferred choice for demanding applications in terms of toughness and safety. The Charpy test has been the most widely used test for a century to indirectly and cost-effectively assess the toughness and ductile fracture properties of X80 steel, as well as to evaluate their strength. A very thorough study has been highlighted on investigating the effects of various factors on the Charpy impact test of X80 steel. This includes controversial factors such as pendulum speed and sample width, which have been chosen for analysis. Furthermore, the study aims to evaluate the mechanical properties of X80 steel using the JC model, with detailed experimental data available in the literature to predict ductile fracture obtained physically. In a quest for improvement, a modified GTN damage correlation finite element model has been developed using a VUMAT algorithm linked to the explicit calculation solver, taking shear stress into account to predict ductile fracture in a process due to void nucleation and coalescence. The results showed that the model improves the accuracy of fracture modeling compared to the JC model, offering good precision and a relevant description of the material’s resilience. Implicitly, the results of this work could be used to improve the design and construction of pipelines, ensuring their safety and reliability. Moreover, the use of established models for comprehensive numerical simulations could offer a less expensive and more effective alternative for assessing material strength and designing pipelines capable of withstanding ductile fractures. In summary, this research has the potential to contribute to the development of safer and more reliable pipelines, with significant implications for the pipeline industry and society as a whole.