Journal
INTERNATIONAL JOURNAL OF FRACTURE
Volume 188, Issue 2, Pages 119-145Publisher
SPRINGER
DOI: 10.1007/s10704-014-9950-8
Keywords
Dynamic fracture; Couple-stress elasticity; Microstructure; Mode-II crack; Micro-rotational inertia; Complex materials
Categories
Funding
- European Union FP7 project Modelling and optimal design of ceramic structures with defects and imperfect interfaces [PIAP-GA-2011-286110-INTERCER2]
- Italian Ministry of Education, University and Research (MIUR) [RBFR 107AKG]
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The present work deals with the problem of a semi-infinite crack steadily propagating in an elastic body subject to plane-strain shear loading. It is assumed that the mechanical response of the body is governed by the theory of couple-stress elasticity including also micro-rotational inertial effects. This theory introduces characteristic material lengths in order to describe the pertinent scale effects that emerge from the underlying microstructure and has proved to be very effective for modeling complex microstructured materials. It is assumed that the crack propagates at a constant sub-Rayleigh speed. An exact full field solution is then obtained based on integral transforms and the Wiener-Hopf technique. Numerical results are presented illustrating the dependence of the stress intensity factor and the energy release rate upon the propagation velocity and the characteristic material lengths in couple-stress elasticity. The present analysis confirms and extends previous results within the context of couple-stress elasticity concerning stationary cracks by including inertial and micro-inertial effects.
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