Microcrack nucleation, growth, coalescence and propagation in the fatigue failure of a powder metallurgy steel

Autor:	E. Dudrova, A. S. Wronski, M. Kabátová
Rok vydání:	2009
Předmět:	Stress (mechanics) Coalescence (physics) Crack closure Materials science Mechanics of Materials Mechanical Engineering Powder metallurgy Metallurgy Nucleation General Materials Science Fracture mechanics Fatigue limit Stress intensity factor
Zdroj:	Fatigue & Fracture of Engineering Materials & Structures. 32:214-222
ISSN:	1460-2695 8756-758X
DOI:	10.1111/j.1460-2695.2009.01328.x
Popis:	Detailed quantitative micrographic data are presented for Stages I and II of a Powder Metallurgy Fe-1.5Cr-0.2Mo-0.7C steel specimen fatigued in bending with R = -1 at 24 Hz and a stress amplitude of 312 MPa. The fatigue limit was ∼240 MPa, at which stress level no microcracks were detected in static loading. Testing was interrupted at 100 cycles and at further 29 intervals until failure after 49 900 cycles. For each arrest, surface replicas were made in the two regions where maximum stress was applied. Microcracks could nucleate below 100 cycles, when their sizes ranged from
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a7167fbdc630a06f3afbcb4e0228c893 https://doi.org/10.1111/j.1460-2695.2009.01328.x Zobrazit plný text záznamu Plný text ve formátu PDF