Publications in Scientific Journals:
R. Lach, W. Grellmann:
"Time- and Temperature-Dependent Fracture Mechanics of Polymers: General Aspects at Monotonic Quasi-Static and Impact Loading Conditions";
Macromolecular Materials and Engineering,
293
(2008),
7;
555
- 567.
English abstract:
Well-defined correlations exist between the maxima in mechanical loss factor and the local maxima in temperature- or loading-speed-dependent fracture toughness. The non-linear viscoelastic fracture processes and small-strain deformations are characterised by the same Arrhenius-type activation enthalpies. The local increase in toughness is linearly correlated with the relaxation strength of molecular relaxation processes. Stable crack propagation can be understood as a three-phase process resulting in steady-state stable crack growth. The normalised
steady-state crack-tip-opening displacement is independent of matrix material, temperature and loading speed.
German abstract:
Well-defined correlations exist between the maxima in mechanical loss factor and the local maxima in temperature- or loading-speed-dependent fracture toughness. The non-linear viscoelastic fracture processes and small-strain deformations are characterised by the same Arrhenius-type activation enthalpies. The local increase in toughness is linearly correlated with the relaxation strength of molecular relaxation processes. Stable crack propagation can be understood as a three-phase process resulting in steady-state stable crack growth. The normalised
steady-state crack-tip-opening displacement is independent of matrix material, temperature and loading speed.
Keywords:
activation energy, fracture mechanics, impact resistance, relaxation, toughness
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1002/200700417
Created from the Publication Database of the Vienna University of Technology.