Fracture initiation in bi-material joints subject to combined tension and shear loading

Research output: Contribution to journalArticle

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5 Downloads (Pure)

Abstract

Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr^(lamda-1), where r is the radial distance from the corner, H is the stress intensity factor and (lamda-1) is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress – shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.
Original languageEnglish
Pages (from-to)2092-2104
Number of pages13
JournalJournal of Adhesion Science and Technology
Volume31
Issue number19-20
DOIs
Publication statusPublished - 24 Jun 2017

Fingerprint

shear
butt joints
brasses
Shear stress
Brass
shear stress
Thermal stress
Tensile stress
Stress intensity factors
Temperature
stress intensity factors
Curing
Loads (forces)
Residual stresses
thermal stresses
curing
tensile stress
Repair
complement
stress distribution

Keywords

  • bonded patch repair joints
  • corner singularity
  • stress intensity factor
  • failure initiation
  • mixed-mode loading
  • thermal stress

Cite this

Fracture initiation in bi-material joints subject to combined tension and shear loading. / Akisanya, AR.

In: Journal of Adhesion Science and Technology, Vol. 31, No. 19-20, 24.06.2017, p. 2092-2104.

Research output: Contribution to journalArticle

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abstract = "Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr^(lamda-1), where r is the radial distance from the corner, H is the stress intensity factor and (lamda-1) is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress – shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.",
keywords = "bonded patch repair joints, corner singularity, stress intensity factor, failure initiation, mixed-mode loading, thermal stress",
author = "AR Akisanya",
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N2 - Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr^(lamda-1), where r is the radial distance from the corner, H is the stress intensity factor and (lamda-1) is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress – shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.

AB - Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr^(lamda-1), where r is the radial distance from the corner, H is the stress intensity factor and (lamda-1) is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress – shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.

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