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2024 | OriginalPaper | Buchkapitel

6. Numerical Simulation of the Initiation and Growth of Small Inner Cracks

verfasst von : Weisheng Zhou, Naoya Tada, Junji Sakamoto

Erschienen in: Creep-Fatigue Fracture: Analysis of Internal Damage

Verlag: Springer Nature Singapore

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Abstract

In this chapter, regarding small inner cracks in creep-fatigue of austenitic stainless steel SUS304, we proposed a numerical simulation method to estimate the spatial distribution of small inner cracks and its changes that cannot be directly and continuously observed, based on the observations of intergranular cracks on the stress axis longitudinal section of specimens obtained from interrupted tests. The small inner crack model, which is the basis of this simulation, is created by a computer model of a stack of planes (multiplanes) consisting of grain boundary facets projected on a plane perpendicular to the stress axis, and cracks are assumed to initiate and grow on grain boundary facets with a temporal and spatial distribution in units of grain boundary facets. By selecting an appropriate crack initiation driving force F and crack propagation driving force K, the crack density, mean crack length, and crack length distribution actually measured on a longitudinal section can be well reproduced from early to late life.

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Vorheriges Kapitel Basics of Model of Random Fracture Resistance of Grain Boundaries

Nächstes Kapitel Effect of Small Inner Cracks on Macrocrack Propagation

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Titel: Numerical Simulation of the Initiation and Growth of Small Inner Cracks
verfasst von: Weisheng Zhou
Naoya Tada
Junji Sakamoto
Verlag: Springer Nature Singapore
Buch: Creep-Fatigue Fracture: Analysis of Internal Damage
Print ISBN: 978-981-9718-78-8

Electronic ISBN: 978-981-9718-79-5

Copyright-Jahr: 2024
DOI: https://doi.org/10.1007/978-981-97-1879-5_6

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