Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Application of Micromechanically-Based Damage Model to Ductile Tearing Behaviour of Interacting Surface Cracks
Submission Author:
Gabriel de Castro Coêlho , PB , Brazil
Co-Authors:
Gabriel de Castro Coêlho, Antonio Almeida Silva, Marco Antonio dos Santos
Presenter: Gabriel de Castro Coêlho
doi://10.26678/ABCM.COBEM2023.COB2023-0380
Abstract
Crack-like flaw interaction is commonly present on the industrial cases and it awakens a critical hazard, as it can lead to crack-driving forces’ amplification, especially when those flaws are located at the same plane. As a result, structural integrity might be affected and residual life of damaged components and engineering structures can be severely reduced. The application of finite element method to predict the fracture behavior of structures and components has been of great importance to assist engineers and researchers on the study of structural integrity and materials thermomechanical behavior. Alongside, the use of damage mechanics and micromechanically-based damage models have gained usage not only on the research field, but also on practical engineering applications. The current paper focus on the application of the well-know GTN model to the study of ductile fracture behaviour of surface cracks under interaction. The GTN model parameters has been calibrated using a resistance curve of ASTM A516 Gr.70 pressure vessel steel. For that, the commercial software ABAQUS® has been used with an explicit finite element solver. The cases analyzed consist of a single surface crack and a pair of twin cracks on a plate remotely load by displacement. The results obtained are consistent with experimental observation of other authors concerning crack-like flaw interaction, and the current implementation is capable of predict crack interaction with crack-driving force amplification, ductile tearing of the materials ligament between both cracks and crack coalescence.
Keywords
ductile tearing, flaw interaction, GTN model, Finite Element Analysis
