Cargando…

Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams

In this study, iron-based metal matrix syntactic foam (MMSF) containing hollow glass microspheres as filler was investigated with respect to notch sensitivity aspects. The MMSF was produced by means of metal powder injection molding. The notch sensitivity was studied via (i) elastic-plastic fracture...

Descripción completa

Detalles Bibliográficos
Autores principales: Lehmhus, Dirk, Weise, Jörg, Szlancsik, Attila, Orbulov, Imre Norbert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321490/
https://www.ncbi.nlm.nih.gov/pubmed/32512863
http://dx.doi.org/10.3390/ma13112566
_version_ 1783551478915399680
author Lehmhus, Dirk
Weise, Jörg
Szlancsik, Attila
Orbulov, Imre Norbert
author_facet Lehmhus, Dirk
Weise, Jörg
Szlancsik, Attila
Orbulov, Imre Norbert
author_sort Lehmhus, Dirk
collection PubMed
description In this study, iron-based metal matrix syntactic foam (MMSF) containing hollow glass microspheres as filler was investigated with respect to notch sensitivity aspects. The MMSF was produced by means of metal powder injection molding. The notch sensitivity was studied via (i) elastic-plastic fracture mechanics measurements (determination of R-curves based on three-point bending tests) and (ii) Charpy impact tests. In both cases, the samples were machined with two different (U- and V-shaped) notch geometries. The critical J-integral value was determined for both notch types, which resulted in lower fracture toughness values in the case of the V-shaped notches and thus notch sensitivity of the material. This finding can be connected to the characteristics of the deformation zone and the associated stress concentration at the tip of the machined notches. The results were confirmed by Charpy impact tests showing ~30% higher impact energy in the case of the U-shaped notch. The failure modes were investigated by means of scanning electron microscopy. In contrast to the bulk material, the MMSF showed brittle fracture behavior.
format Online
Article
Text
id pubmed-7321490
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-73214902020-06-29 Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams Lehmhus, Dirk Weise, Jörg Szlancsik, Attila Orbulov, Imre Norbert Materials (Basel) Article In this study, iron-based metal matrix syntactic foam (MMSF) containing hollow glass microspheres as filler was investigated with respect to notch sensitivity aspects. The MMSF was produced by means of metal powder injection molding. The notch sensitivity was studied via (i) elastic-plastic fracture mechanics measurements (determination of R-curves based on three-point bending tests) and (ii) Charpy impact tests. In both cases, the samples were machined with two different (U- and V-shaped) notch geometries. The critical J-integral value was determined for both notch types, which resulted in lower fracture toughness values in the case of the V-shaped notches and thus notch sensitivity of the material. This finding can be connected to the characteristics of the deformation zone and the associated stress concentration at the tip of the machined notches. The results were confirmed by Charpy impact tests showing ~30% higher impact energy in the case of the U-shaped notch. The failure modes were investigated by means of scanning electron microscopy. In contrast to the bulk material, the MMSF showed brittle fracture behavior. MDPI 2020-06-04 /pmc/articles/PMC7321490/ /pubmed/32512863 http://dx.doi.org/10.3390/ma13112566 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lehmhus, Dirk
Weise, Jörg
Szlancsik, Attila
Orbulov, Imre Norbert
Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title_full Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title_fullStr Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title_full_unstemmed Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title_short Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams
title_sort fracture toughness of hollow glass microsphere-filled iron matrix syntactic foams
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321490/
https://www.ncbi.nlm.nih.gov/pubmed/32512863
http://dx.doi.org/10.3390/ma13112566
work_keys_str_mv AT lehmhusdirk fracturetoughnessofhollowglassmicrospherefilledironmatrixsyntacticfoams
AT weisejorg fracturetoughnessofhollowglassmicrospherefilledironmatrixsyntacticfoams
AT szlancsikattila fracturetoughnessofhollowglassmicrospherefilledironmatrixsyntacticfoams
AT orbulovimrenorbert fracturetoughnessofhollowglassmicrospherefilledironmatrixsyntacticfoams