Determination of the fracture energy of a composite by the method of digital speckle correlation

We have developed a computational-and-experimental procedure for evaluating the fracture energy of composite materials, which lies in the determination of surface displacements in a neighborhood of the tip of a stress concentrator under static tension by the method of digital speckle correlation. Us...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2010-12, Vol.46 (3), p.376-382
Main Authors: Ivanyts’kyi, Ya. L., Muravs’kyi, L. I., Hembara, O. V., Hvozdyuk, M. M., Polovynko, T. I.
Format: Article
Language:English
Subjects:
Analysis
Characterization and Evaluation of Materials
Chemistry and Materials Science
Correlation
Digital
Epoxy resins
Fracture mechanics
Fracture toughness
Materials Science
Methods
Solid Mechanics
Strain
Stress strain curves
Stress-strain relationships
Stresses
Structural Materials
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Summary:We have developed a computational-and-experimental procedure for evaluating the fracture energy of composite materials, which lies in the determination of surface displacements in a neighborhood of the tip of a stress concentrator under static tension by the method of digital speckle correlation. Using the known displacement distribution, we calculate strains in the prefracture zone as well as the opening and shear of crack lips for given loading force and measuring base. The static tensile stress-strain diagram, together with the established specimen strain, enables us to find stresses in the prefracture zone. Using these data, we find the fracture energy of the composite. We also present some results of investigations for a three-layer composite material based on an epoxy-phenol plastic reinforced chaotically with disperse particles.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-010-9300-6