Experimental Determination of Cohesive Zone Models for Epoxy Composites |
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Authors: | P F Fuchs Z Major |
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Institution: | (1) Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria;(2) Institute of Polymer Product Engineering, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria |
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Abstract: | In this work, a new test set-up was applied in order to determine cohesive zone models experimentally. A high speed camera
in combination with a digital image correlation system was used to record the local displacements enabling the detailed determination
of crack opening values. The J-Integral method was used to calculate the cohesive stresses. The analyzed materials were composites
made of glass fiber reinforced epoxy resin layers. Two different specimen geometries and the difference between warp and weft
of the glass fiber mats were analyzed. As the specimen geometry didn’t have a significant influence, the difference between
warp and weft, regarded by the loading direction, lead to considerably different cohesive zone laws. The initial part, the
linear increase to a maximum stress, was very similar, while the damage evolution was either exponential or bilinear in shape.
In future work, the derived cohesive zone models will be used to perform finite element simulations on laboratory specimens
and on component scale. Thus, by comparison to the measurement result, the cohesive zone models can be evaluated. |
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