Acoustic emission based characterization of void nucleation in a ductile fracture model

• Published in: Engineering fracture mechanics 2024-05, Vol.302, p.110051, Article 110051
• Main Authors: Chakraborty, Subham, Banerjee, Anuradha, Keralavarma, Shyam M.
• Format: Article
• Language: English
• Subjects: Acoustic emission; Ductile fracture; Micromechanical model; Void nucleation
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2024.110051

Phenomenological models are commonly used to model void nucleation from second phase particles in ductile fracture simulations. Parameters in these continuum models are typically estimated using indirect methods, by comparison with experimental fracture data. In this paper, a novel approach based on acoustic emission (AE) measurements in smooth and notched bar tension tests is proposed to estimate void nucleation model parameters such as the mean and standard deviation of the nucleation strains. Tensile tests on AA 7075-T651 specimens combined with AE data establish a robust correlation between AE amplitude and the average void nucleation rate. The nucleation parameters are calibrated using a dog-bone tensile specimen. Simulations using these calibrated parameters accurately reproduces AE amplitude trends in other specimen geometries. This approach provides a promising alternative to traditional calibration methods, enhancing the reliability and adaptability of void growth based ductile fracture models. [Display omitted] •A correlation exists between void nucleation and acoustic emission (AE) amplitude for AA 7075-T651.•The Chu and Needleman void nucleation parameters can be calibrated using acoustic emission.•With calibrated parameters, the model reproduces AE amplitude characteristics in various geometries.