Exploiting fractal features to determine fatigue crack growth rates of metallic materials

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24620%2F22%3A00010685" target="_blank" >RIV/46747885:24620/22:00010685 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0013794422003228?via=ihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0013794422003228?via=ihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.engfracmech.2022.108589" target="_blank" >10.1016/j.engfracmech.2022.108589</a>

Result language

angličtina

Original language name

Exploiting fractal features to determine fatigue crack growth rates of metallic materials

Original language description

An alternative approach to the classical fracture mechanics equation to quantify the fatigue crack growth rate is proposed and examined. The method exploits the fractal features of the propagating fatigue crack. The reference crack growth response of AISI 410 martensitic stainless steel is established using compact tension C(T) specimens. Fractal analysis of microscopic images along the edge length of the crack establishes the fractal dimensions, d(F) of the fatigue crack. The box-counting algorithm is developed for the fractal analysis based on optical images of the crack at 100X magnification and the resolution of 1090 pixels/mm. Results show that the crack initially exhibits a Euclidean nature (d(F) approximate to 1). The fractal dimension increases steadily with increasing crack length in the Paris crack growth rate region with 1.05 b d(F) b 1.24. The corresponding stress intensity factor range varies between 18 b= Delta K-I b= 40 MPa root m. The fractal dimension, d(F) correlates linearly with the normalized stress intensity factor range, Delta K/K(IC)within the Paris crack growth region. This enables the multifractal fatigue crack growth rate equation to be established in terms of the fractal dimension, Paris coefficient and exponent, and fatigue fracture properties of the material. The fatigue crack growth rate of the material could then be determined using the multifractal fatigue crack growth rate model without requiring the geometry factor of the crack.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/EF16_025%2F0007293" target="_blank" >EF16_025/0007293: Modular platform for autonomous chassis of specialized electric vehicles for freight and equipment transportation</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ENGINEERING FRACTURE MECHANICS

ISSN

0013-7944

e-ISSN

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Volume of the periodical

270

Issue of the periodical within the volume

JUL

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

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UT code for WoS article

000833424200008

EID of the result in the Scopus database

2-s2.0-85131464028