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Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

D'Angela, Danilo, Ercolino, Marianna ORCID: 0000-0001-8678-0631, Bellini, Costanzo ORCID: 0000-0003-4804-6588, Di Cocco, Vittorio ORCID: 0000-0002-1668-3729 and Iacoviello, Francesco ORCID: 0000-0002-9382-6092 (2020) Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing. Fatigue & Fracture of Engineering Materials & Structures, 43 (5). pp. 1038-1050. ISSN 8756-758X (Print), 1460-2695 (Online) (doi:https://doi.org/10.1111/ffe.13214)

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Abstract

The damaging micromechanisms in a pearlitic (EN-GJS700-2) Ductile Cast Iron (DCI) are investigated by means of Scanning Electron Microscope (SEM) analysis and Acoustic Emission (AE) testing. Monotonic uniaxial tensile tests are performed on microtensile specimens under strain control. SEM analysis is applied under in-situ conditions by means of a tensile holder. The multiple damaging micromechanisms are identified, and their evolution along with the mechanical response is characterised. The traditional AE features are found to be qualitatively correlated to the onset of the fracture damage over the elastic behaviour. The Information Entropy of the AEs evaluated according to both Shannon and Kullback-Leibler formulations is proven to be well correlated to the ongoing damage, and the incipient failure. Tentative failure criteria are finally proposed. The assessment approach is found to be promising for structural health monitoring purposes.

Item Type: Article
Uncontrolled Keywords: Ductile Cast Iron (DCI); Scanning Electron Microscope (SEM); Acoustic Emissions (AEs); Shannon Entropy; Structural Health Monitoring
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 03 Mar 2021 01:38
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: REF 6
URI: http://gala.gre.ac.uk/id/eprint/27292

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