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Archive of Applied Mechanics

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12.12.2017 | Original

Assessment of creep interaction of double elliptical cracks at elevated temperatures using numerical analysis

verfasst von: Lei Zhao, Zunyi Zhao, Lianyong Xu, Yongdian Han, Hongyang Jing

Erschienen in: Archive of Applied Mechanics | Ausgabe 5/2018

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Abstract

The interaction and combination of multiple embedded cracks would accelerate cracks growth and shortened the components life. In this study, the interaction of the multiple embedded cracks in a finite thickness plate subjected to remote tensile loading in the creep regime was investigated using comprehensive finite element calculations. In addition, the features of cracks and material properties (e.g., crack aspect ratios a / c, relative crack depth a / t, relative distance s / c and creep hardening exponent n) were considered. The results revealed that the creep interaction factor distribution was asymmetric along the crack front. In addition, the creep interaction factor increased as the crack depth and creep hardening exponent increased and gradually decreased as the position away from the each other. However, the crack shape changing from elliptical shape to circular shape had slight impact. Furthermore, based on the comprehensive analyses, an empirical formula to determine the multiple interaction level considering the crack configurations and the material properties was proposed for the embedded cracks operating at elevated temperatures.

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Titel: Assessment of creep interaction of double elliptical cracks at elevated temperatures using numerical analysis
verfasst von: Lei Zhao
Zunyi Zhao
Lianyong Xu
Yongdian Han
Hongyang Jing
Publikationsdatum: 12.12.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Archive of Applied Mechanics / Ausgabe 5/2018
Print ISSN: 0939-1533
Elektronische ISSN: 1432-0681
DOI: https://doi.org/10.1007/s00419-017-1335-9

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