Mechanical behavior of a cellular composite under quasi-static, static, and cyclic compression loading |
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Authors: | Sergej Diel Otto Huber Holger Saage Paul Steinmann Werner Winter |
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Affiliation: | (1) Competence Center for Lightweight Design, University of Applied Sciences Landshut, Landshut, Germany;(2) Chair of Applied Mechanics, University of Erlangen-Nuremberg, Erlangen, Germany |
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Abstract: | The quasi-static, static, and cyclic compressive behavior of a novel epoxy matrix cellular composite reinforced with glass
foam granules is investigated. Three different grain-size fractions of the granules are used: 0.5–1, 1–2, and 2–4 mm. The
density of the cellular composite varies between 0.65 and 0.82 g/cm3. The material exhibits high specific compressive strength
and stiffness within the class of cellular materials; these properties can be varied using appropriate size of granules. The
glass foam granules increase the stiffness of the cellular composite compared to neat epoxy foam with the same weight. The
measured elastic properties are in good agreement with results obtained from analytical and numerical homogenization methods.
The fatigue behavior is determined in static tests and in cyclic tests at 1 and 20 Hz on one type of cellular composite. The
fatigue process for cyclic loading is a result of an interaction between static and cyclic damage. The sensitivity to static
damage is found to be higher than to cyclic damage. The damage behavior is investigated by evaluation specimen’s stiffness
and using scanning electron microscopy. |
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