Cohesive zone modelling and the fracture process of structural tape

Ulf Stigh, Anders Biel, Daniel Svensson

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Abstract

Structural tapes provide comparable toughness as structural adhesives at orders of magnitude lower stresses. This is potentially useful to minimize the effects of differences in thermal expansion in the joining of mixed materials. The strength properties are modelled using the cohesive zone model. Thus, a cohesive zone represents the tape, i.e. stresses in the tape are transmitted to the substrates through tractions determined by the separations of the surfaces of substrates. This simplification allows for structural analysis of large complex structures. The relation between the traction and the separation is measured experimentally using methods based on the path independence of the J-integral. Repeated experiments are performed at quasi-static loading. A mixed mode cohesive law is adapted to the experimental data. The law is implemented as a UMAT in Abaqus. Simulations show minor thermal distortions due to thermal loading and substantial structural strength in mechanical loading of a mixed material structure.
Original languageEnglish
Title of host publicationProcedia Structural Integrity
Number of pages10
Volume2
PublisherElsevier
Publication date2016
Pages235-244
DOIs
Publication statusPublished - 2016
Event21st European Conference on Fracture - Catania, Italy
Duration: 20 Jun 201624 Jun 2016

Conference

Conference21st European Conference on Fracture
Country/TerritoryItaly
CityCatania
Period20/06/201624/06/2016
SeriesProcedia Structural Integrity
ISSN2452-3216

Keywords

  • Mixed Material Joint
  • Structural Strength
  • FEA
  • J-Integral Method

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