Abstract
We report tensile failure experiments on polyurethane (PU) foams. Experiments have been performed by imposing a constant strain rate. We work on heterogeneous materials for whom the failure does not occur suddenly and can develop as a multistep process through a succession of microcracks that end at pores. The acoustic energy and the waiting times between acoustic events follow power-law distributions. This remains true while the foam density is varied. However, experiments at low temperatures (PU foams more brittle) have not yielded power-laws for the waiting times. The cumulative acoustic energy has no power-law divergence at the proximity of the failure point which is qualitatively in agreement with other experiments done at imposed strain. We notice a plateau in cumulative acoustic energy that seems to occur when a single crack starts to propagate.
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Deschanel, S., Vanel, L., Vigier, G. et al. Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density. Int J Fract 140, 87–98 (2006). https://doi.org/10.1007/s10704-006-0051-1
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DOI: https://doi.org/10.1007/s10704-006-0051-1