Helder B M Martins, Silvestre T Pinho,

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MODELS VALIDATION FOR THE PIN-LOAD JOINT
PROBLEM A TECHNICAL NOTE
Helder B M Martins, Silvestre T Pinho, Pedro P
Camanho, Paulo M S T de Castro IDMEC and Depart
Eng Mecânica e Gestão Industrial, Faculdade de
Engenharia da Universidade do Porto, Portugal
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no bending effects considered ...
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geometry of the model
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FEM mesh and detail
3600 elements of the CPS8 type (8- node plane
stress isoparametric element - ABAQUS)
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three cases studied rigid, flexible (Al) pin,
and point load
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superposition solution used by Cartwright and
Parker
SIF for case c K for case a K5a)
for case b - K5b)
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assumed cosine pressure distribution in the hole
surface
D J Cartwright, A P Parker, Opening mode stress
intensity factors for cracks in pin loaded
joints, International Journal of Fracture,
vol.18 (1), 1982, pp.65-78
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comparison of K results for a range of a/R values
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radial stress/pressure field in the hole (?0 -
remote applied stress)
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conclusions

• K values
• point load gt Cartwright and Parker ref ?1? -
  assumed cosine pressure field gt flexible pin gt
  rigid pin
• ref ?1? underestimates the pressure close to
  the crack region, and slightly overestimates
  pressure along the vertical axis. These
  differences may justify the differences of
  approximately 5 found in SIF evaluations
• modelling the pin as a concentrated load leads
  to an overestimation of K, and may therefore be
  considered a conservative simplification.