lnvestigation of Patch Coatings lnfluence on the Stress lntensity Factor for Surface Cracks

Søren Heide Lambertsen, Michael S. Jepsen, Lars Damkilde

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Abstract

In this paper, it is investigated how a surface layer of epoxy glue will affect the crack propagation of a surface crack. The intension is to reduce or even stop the crack propagation by means of patch layer coating. When adding a patch layer to the surface with small cracks, the layer will attempt to damp the free end of the crack, which will reduce the stress intensity factor and subsequently reduce the crack growth. The considered patch consists of a surface layer of 0.2 mm two component adhesive Epoxy, 3M DP 460. The models described in this work contains five different crack sizes with a patch layer on the surface. The stress intensity factor is computed by means of the J-integral and the FE-model is setup with a nonlinear material model to establish the upper boundary for the patch stress capacity. A reduction of the stress intensity factor of approximately 2 % and a reduction of the crack growth of 5.4-6.1 % for crack sizes of 0.5, l and 2 mm is achieved by applying the patch layer. In the analysis, cracks of 3 mm and 5 mm are rejected due to plastic strain in the patch layer, consequently the effect of
the patch layer is insignificant.
OriginalsprogEngelsk
TitelProceedings of the 26th Nordic Seminar on Computational Mechanics : Oslo, 23-25 October 2013
RedaktørerAnders Logg, Kent-Andre Mardal, Andé Massing
Antal sider4
ForlagCenter for Biomedical Computing, Simula Research Laboratory
Publikationsdato2013
Sider210-213
ISBN (Trykt)978-82-92593-12-7
StatusUdgivet - 2013
BegivenhedThe 26th Nordic Seminar on Computational Mechanics - Oslo, Norge
Varighed: 23 okt. 201325 okt. 2013
Konferencens nummer: 26

Konference

KonferenceThe 26th Nordic Seminar on Computational Mechanics
Nummer26
Land/OmrådeNorge
ByOslo
Periode23/10/201325/10/2013

Emneord

  • Patch Repairing
  • Fatigue Life
  • Stress Intensity Factors

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