A critical local energy release rate criterion for fatigue fracture of elastomers

Abstract

To cite this version:Samy Mzabi, Daniel Berghezan, Stéphane Roux, François Hild, Costantino Creton. A critical local energy release rate criterion for fatigue fracture of elastomers.

Bulk Energy Dissipation Mechanism for the Fracture of Tough and Self-Healing Hydrogels

“…Except for the points at high tearing velocity, all the observed crack velocities at various temperatures are slightly lower than the applied tearing velocities over a wide range, as shown in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 velocity ܸ and temperature T, and ߁ is a threshold value of the polymer network below which no fracture occurs. 25,27,28,42,43 During crack propagation, the intrinsic fracture energy of a polymer network involves several complex processes, including chain breaking, cavitation formation, and so on, while the bulk viscoelastic energy dissipation only involves the viscoelastic deformation process around the crack tip.…”

Nanocavitation around a crack tip in a soft nanocomposite: A scanning microbeam small angle X-ray scattering study

“…Unnotched samples were first strained for 10,000 cycles from zero strain to a maximum tensile strain of 30% (defined as e 5 DH/H 0 where DH is the change of height and H 0 is the initial height) at a frequency f 5 10 Hz to avoid the stress-softening effect (Mullins effect). 26 An edge crack (10 mm) was then cut with a razor blade along the length direction. The notched specimens were subjected to 20000 cycles (f 5 16 Hz) to a maximum accommodation strain e a (e a < 30%) that corresponds to various maximum values of the energy release rate G. After typically 5000 cycles, the crack propagation velocity and crack tip shape remain nearly constant.…”

“…33 Therefore the local strain around the crack tip was roughly three times that of e m (90%), consistent with previous measurements of the strain field near crack tip by digital image correlation. 26 When the beam was partially or completely in the crack, / void became meaningless and the data points where part of the beam was inside the crack are therefore not shown. The values of / void at other two positions (x 5 6 100 lm) are also depicted in Figure 3.…”

“…However, near a crack tip, the presumed cavitation region inside the process zone is likely to be strongly localized (<200 lm). 26 A successful structural investigation around the crack tip hence requires access to both smaller beam size (<50 lm) and a low q range to detect large objects (100 nm).…”

J‐Integral from Full Field Kinematic Data for Natural Rubber Compounds

“…For hyperelastic materials, to the best of the authors' knowledge, the only attempt at studying fracture via DIC is the work by Mzabi et al [14], where an ad-hoc criterion for fatigue fracture was proposed, outside of the standard elastic fracture mechanics criteria. For such a class of materials the evaluation of fracture mechanics quantities such as the Jintegral may be more complicated than for linear elastic ones.…”