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Erschienen in:
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2024 | OriginalPaper | Buchkapitel

7. Effect of Small Inner Cracks on Macrocrack Propagation

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, time-dependent and cycle-dependent crack propagation tests were conducted using notched specimens of SUS304 stainless steel in 4 major cases to investigate the effect of small inner cracks introduced by high-temperature cp-type creep-fatigue on macrocrack propagation. For the case of a macrocrack propagation in the zone containing no small crack (Case 1), the macrocrack propagation under cc-type and cp-type conditions is time-dependent, while the macrocrack propagation under pp-type and pc-type conditions is cycle-dependent. For the case of a macrocrack propagation in the zone containing uniformly distributed pre-small cracks (Case 2), the existing small inner cracks accelerate both time-dependent and cycle-dependent macrocrack propagation. For the case of a macrocrack propagation in the process zone with small crack nucleation (Case 3), many small intergranular cracks were observed near the main crack inside the specimen, and the macrocrack propagation rate was approximately 4 times higher than that of the time-dependent crack propagation of case 1. For the case of a macrocrack propagation combined with Case 2 and Case 3 (Case 4), the macrocrack propagation rate is almost equal to that in Case 3 under same conditions.

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Vorheriges Kapitel Numerical Simulation of the Initiation and Growth of Small Inner Cracks
Nächstes Kapitel Annihilation and Healing of Small Inner Cracks and Extension of Fatigue Life
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Metadaten
Titel
Effect of Small Inner Cracks on Macrocrack Propagation
verfasst von
Weisheng Zhou
Naoya Tada
Junji Sakamoto
Copyright-Jahr
2024
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_7

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