Experimental Determination of Cohesive Zone Models for Epoxy Composites

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 met...

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Bibliographic Details
Published in:Experimental mechanics 2011-06, Vol.51 (5), p.779-786
Main Authors: Fuchs, P. F., Major, Z.
Format: Article
Language:English
Subjects:
Applied sciences
Artificial intelligence
Biomedical Engineering and Bioengineering
Characterization and Evaluation of Materials
Composites
Computer science
control theory
systems
Control
Dynamical Systems
Engineering
Exact sciences and technology
Forms of application and semi-finished materials
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Lasers
Optical Devices
Optics
Pattern recognition. Digital image processing. Computational geometry
Photonics
Physics
Polymer industry, paints, wood
Solid Mechanics
Structural and continuum mechanics
Technology of polymers
Vibration
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Summary: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.
ISSN:0014-4851
1741-2765
DOI:10.1007/s11340-010-9370-2