A J Integral Approach for Measuring Cohesive Laws Using a Modified DCB Sandwich Specimen

Christian Lundsgaard-Larsen (Invited author), Christian Berggreen (Invited author), Bent F. Sørensen (Invited author)

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Extraction of cohesive laws are conducted for interfaces in sandwich structures. Separation between face and core are driven by pure bending moments applied to a double cantilever beam (DCB) specimen. By varying the ratio between moments applied to the two beams the test is conducted for different mode mixities. The sandwich specimen consists of glass fiber faces and Divinycell H200 foam core. Arbitrary stiffening of the sandwich specimen with steel bars adhered to the faces reduces rotations and ensures that the method is useable for a wide range of materials. The J integral is employed and the opening of the pre-crack tip is recorded by a commercial digital photogrammetry measurement system. Cohesive laws are extracted by differentiating J with respect to the normal and tangential opening of the pre-crack tip. Some results are presented and discussed.
Original languageEnglish
Title of host publicationExperimental Analysis of Nano and Engineering Materials and Structures : Proceedings of the 13th International Conference on Experimental Mechanics
EditorsE. E. Gdoutos
Number of pages978
Place of PublicationDordrecht, The Netherlands
PublisherSpringer
Publication date2007
ISBN (Print)978-1-4020-6238-4
Publication statusPublished - 2007
Event13th International Conference on Experimental Mechanics - Alexandroupolis, Greece
Duration: 1 Jul 20076 Jul 2007

Conference

Conference13th International Conference on Experimental Mechanics
CountryGreece
CityAlexandroupolis
Period01/07/200706/07/2007

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