The effect of interacting small defects on the fatigue limit of a medium carbon steel

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussavertaisarvioitu

Tutkijat

Organisaatiot

  • Kyushu University

Kuvaus

Structural steels contain various material irregularities and natural defects. These cause local stress concentrations, from which fatigue cracks tend to initiate. Two defects in close proximity to each other may affect local stress distributions and thus, begin to interact. In this paper, the effect of interacting small cracks on the fatigue limit is systematically investigated in a medium carbon steel. The growth of interacting cracks, as well as the characteristics of non-propagating cracks and microstructural aspects were closely examined via the plastic replica method. It was found that although the fatigue limit is essentially controlled by the mechanics of interacting cracks, based on their configuration, the local microstructure comprised of ferrite and pearlite has a statistical scatter effect on the behaviour of interacting cracks and non-propagating thresholds. With respect to the fatigue limit, when two defects were in close proximity, they behaved as would a larger single defect. However, with greater spacing between defects, rather than mechanical factors, it is the local microstructure which determines the location and characteristics of non propagating cracks. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

Yksityiskohdat

AlkuperäiskieliEnglanti
Otsikko21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21)
ToimittajatF Iacoviello, L Susmel, D Firrao, G Ferro
TilaJulkaistu - 2016
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaEuropean Conference on Fracture - Catania, Italia
Kesto: 20 kesäkuuta 201624 kesäkuuta 2016
Konferenssinumero: 21

Julkaisusarja

NimiProcedia Structural Integrity
KustantajaELSEVIER SCIENCE BV
Vuosikerta2
ISSN (painettu)2452-3216

Conference

ConferenceEuropean Conference on Fracture
LyhennettäECF
MaaItalia
KaupunkiCatania
Ajanjakso20/06/201624/06/2016

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