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Authors Dollhofer, J. ; Beckert, W. ; Lauke, B. ; Schneider, K.
Title Fracture mechanics characterization of mixed-mode toughness of thermoplast/glass interfaces (brittle/ductile interfacial mixed-mode fracture)
Date 31.12.2001
Number 10323
Abstract Interfacial toughness is enhanced when the mode-mixity of the biaxial near-tip stress state approaches mode II. Conversely, when the near-tip mode-mixity is close to pure mode I, the interfacial toughness curve exhibits a minimum. This toughness minimum is believed to represent the so-called intrinsic adhesion. Within linear elasticity, the biaxial, singular near-tip solution for an open interface crack may be employed for characterizing the local stress state as long as non-linearities due to crack-wall contact and plastic flow are contained within a length scale small enough compared to the extension of the near-tip opening-dominated fields. In the present work, the interfacial mixed-mode fracture toughness curve was determined for a polyethylene/glass compound. Subsequent to the reduction of experimental data based on the linear-elastic crack model, the applicability of linearelastic fracture mechanics is verified by comparing the estimated extension of the plastic zones to the extension of the <I>K</I>-dominance zone. It is found that within the mixed-mode range accessible to linear-elastic fracture mechanics the apparent interfacial fracture toughness varies by about an order of magnitude.
Publisher Journal of Adhesion Science and Technology
Wikidata
Citation Journal of Adhesion Science and Technology 15 (2001) 1559-1587
DOI https://doi.org/10.1163/156856101753207689
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