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Crack initiation in elliptically notched plates
Author(s) -
Weißgraeber Philipp,
Felger Julian,
Becker Wilfried
Publication year - 2015
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201510072
Subject(s) - ellipse , stress intensity factor , materials science , stress concentration , fracture mechanics , tension (geology) , stress (linguistics) , stress field , mechanics , fracture (geology) , aspect ratio (aeronautics) , structural engineering , composite material , finite element method , geometry , mathematics , physics , engineering , compression (physics) , linguistics , philosophy
In this work, crack initiation in elliptically notched plates under uniaxial tension is studied by means of a Finite Fracture Mechanics analysis. The stress concentration factor changes with the aspect ratio of the half axes: from unity for slender ellipses in loading direction to infinity for crack‐like ellipses normal to the loading. The closed‐form solutions of the stress field and an approximate formulae of the stress intensity factor of mode I cracks allows for an efficient Finite Fracture Mechanics analysis of plates with elliptical notches with arbitrary aspect ratios. The results show that the transition from vanishing stress concentration to infinite (crack‐like) stress concentration is rendered continuously by the present approach. A transition from strength of materials to Linear Elastic Fracture Mechanics is obtained that shows distinct size effects. A comparison to experimental results on size effects of notched plates shows good agreement. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)