The strength of adhesive-bonded joints between fibre-reinforced plastics and metals

Analysis, shape optimization and experiments

Martin Hildebrand

Research output: Book/ReportReportProfessional

Abstract

The behaviour of adhesive-bonded joints between fibre-reinforced plastics (FRP) and metals was investigated using numerical methods as well as experiments. Various joint types were considered: single-lap joints, T-joints and two actual cases. Non-linear finite element methods were used in the analysis of the joints. The importance of allowing for both geometric and for material non-linearities is shown. The single-lap joints were optimized by modifying the geometry of the joint ends. Different shapes of adhesive fillet, reverse tapering of the adherend, rounded edges and grooves were applied in order to increase the joint strength. The influence of the joint-end geometry is shown for different metal/FRP adherend/adhesive combinations. Depending on the material combinations, the strength of the joints can be increased with a careful joint-end design by 90 - 250%. The same modifications of the joint ends were applied to the T-joints. The strength of T-joints can be increased by 200% using a proper joint-end design. To verify the analytical results, static tests were performed with single-lap joints and two actual cases. Both cases were tested at elevated temperature. One case was tested in fatigue. The effect of defects on the strength of single-lap joints was investigated experimentally. The influence of defects in the adhesive layer on the strength of the joints was remarkably low for the chosen material combination. The reduction of strength was not higher than the reduction in joint area.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages66
ISBN (Print)951-38-4630-X
Publication statusPublished - 1994
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.192
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Metal analysis
Fiber reinforced metals
Adhesive joints
Fiber reinforced plastics
Shape optimization
Adhesives
Plastic adhesives
Defects
Geometry
Experiments
Numerical methods
Fatigue of materials
Finite element method
Metals
Temperature

Keywords

  • plastics
  • metals
  • joining
  • fiber reinforcement
  • adhesive bonding
  • bonding strength
  • analysis
  • finite element analysis
  • shape
  • optimization

Cite this

Hildebrand, M. (1994). The strength of adhesive-bonded joints between fibre-reinforced plastics and metals: Analysis, shape optimization and experiments. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 192
Hildebrand, Martin. / The strength of adhesive-bonded joints between fibre-reinforced plastics and metals : Analysis, shape optimization and experiments. Espoo : VTT Technical Research Centre of Finland, 1994. 66 p. (VTT Publications; No. 192).
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abstract = "The behaviour of adhesive-bonded joints between fibre-reinforced plastics (FRP) and metals was investigated using numerical methods as well as experiments. Various joint types were considered: single-lap joints, T-joints and two actual cases. Non-linear finite element methods were used in the analysis of the joints. The importance of allowing for both geometric and for material non-linearities is shown. The single-lap joints were optimized by modifying the geometry of the joint ends. Different shapes of adhesive fillet, reverse tapering of the adherend, rounded edges and grooves were applied in order to increase the joint strength. The influence of the joint-end geometry is shown for different metal/FRP adherend/adhesive combinations. Depending on the material combinations, the strength of the joints can be increased with a careful joint-end design by 90 - 250{\%}. The same modifications of the joint ends were applied to the T-joints. The strength of T-joints can be increased by 200{\%} using a proper joint-end design. To verify the analytical results, static tests were performed with single-lap joints and two actual cases. Both cases were tested at elevated temperature. One case was tested in fatigue. The effect of defects on the strength of single-lap joints was investigated experimentally. The influence of defects in the adhesive layer on the strength of the joints was remarkably low for the chosen material combination. The reduction of strength was not higher than the reduction in joint area.",
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Hildebrand, M 1994, The strength of adhesive-bonded joints between fibre-reinforced plastics and metals: Analysis, shape optimization and experiments. VTT Publications, no. 192, VTT Technical Research Centre of Finland, Espoo.

The strength of adhesive-bonded joints between fibre-reinforced plastics and metals : Analysis, shape optimization and experiments. / Hildebrand, Martin.

Espoo : VTT Technical Research Centre of Finland, 1994. 66 p. (VTT Publications; No. 192).

Research output: Book/ReportReportProfessional

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AB - The behaviour of adhesive-bonded joints between fibre-reinforced plastics (FRP) and metals was investigated using numerical methods as well as experiments. Various joint types were considered: single-lap joints, T-joints and two actual cases. Non-linear finite element methods were used in the analysis of the joints. The importance of allowing for both geometric and for material non-linearities is shown. The single-lap joints were optimized by modifying the geometry of the joint ends. Different shapes of adhesive fillet, reverse tapering of the adherend, rounded edges and grooves were applied in order to increase the joint strength. The influence of the joint-end geometry is shown for different metal/FRP adherend/adhesive combinations. Depending on the material combinations, the strength of the joints can be increased with a careful joint-end design by 90 - 250%. The same modifications of the joint ends were applied to the T-joints. The strength of T-joints can be increased by 200% using a proper joint-end design. To verify the analytical results, static tests were performed with single-lap joints and two actual cases. Both cases were tested at elevated temperature. One case was tested in fatigue. The effect of defects on the strength of single-lap joints was investigated experimentally. The influence of defects in the adhesive layer on the strength of the joints was remarkably low for the chosen material combination. The reduction of strength was not higher than the reduction in joint area.

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Hildebrand M. The strength of adhesive-bonded joints between fibre-reinforced plastics and metals: Analysis, shape optimization and experiments. Espoo: VTT Technical Research Centre of Finland, 1994. 66 p. (VTT Publications; No. 192).