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Fracture assessment of carbon fibre/epoxy reinforcing rings through a combination of full-scale testing, small-scale testing and stress modeling

(2006) APPLIED COMPOSITE MATERIALS. 13(2). p.57-85
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Abstract
Carbon fibre/epoxy rings are used as radial reinforcement for polymer bearing elements with nominal diameter 250 mm functioning under 150 MPa. Full-scale static and dynamic testing revealed no catastrophic failure for loading to 400 MPa, although there was circumferential splitting of carbon fibres at the machined top edge causing counterface wear under sliding. A combined numerical-experimental analysis was applied for design improvement with a representative small-scale qualification test on the real ring geometry, inducing additional stress concentrations compared to ASTM standards. Full-scale modelling revealed high radial-axial shear stresses (33 MPa) in non-hydrostatically loaded zones, while it increased towards 104 MPa under hydrostatic load conditions. The former is the most critical and should be simulated either on a small-scale unidirectional compression test or on a representative short beam shear test, respectively, measuring the radial-axial or radial-tangential shear strength. A relation between both small-scale states of stress was experimentally and numerically studied, experiencing that the composite ring has lower radial-tangential shear stress compared to radial-axial shear stress as a different hydrostatic stress state is observed in the bulk of the composite ring. As a compressive test is however more difficult to perform than a short-beam-shear test, a representative design criterion for shear fracture is determined from failure at 27 kN normal load in a short-beam-shear test. Finally, fracture is avoided by optimising the cross-sectional geometry of the composite reinforcing ring and close control of the processing parameters.
Keywords
UNIDIRECTIONAL COMPOSITES, INTERLAMINAR SHEAR-STRENGTH, COMPRESSION STRENGTH, HYDROSTATIC-PRESSURE, ELEMENT, INTERFACE, 3-POINT, FIBER, finite elements, full-scale, shear failure, small-scale

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Chicago
Samyn, Pieter, L VAN SCHEPDAEL, Wim Van Paepegem, JS LEENDERTZ, E SUISTER, Patrick De Baets, and Joris Degrieck. 2006. “Fracture Assessment of Carbon Fibre/epoxy Reinforcing Rings Through a Combination of Full-scale Testing, Small-scale Testing and Stress Modeling.” Applied Composite Materials 13 (2): 57–85.
APA
Samyn, Pieter, VAN SCHEPDAEL, L., Van Paepegem, W., LEENDERTZ, J., SUISTER, E., De Baets, P., & Degrieck, J. (2006). Fracture assessment of carbon fibre/epoxy reinforcing rings through a combination of full-scale testing, small-scale testing and stress modeling. APPLIED COMPOSITE MATERIALS, 13(2), 57–85.
Vancouver
1.
Samyn P, VAN SCHEPDAEL L, Van Paepegem W, LEENDERTZ J, SUISTER E, De Baets P, et al. Fracture assessment of carbon fibre/epoxy reinforcing rings through a combination of full-scale testing, small-scale testing and stress modeling. APPLIED COMPOSITE MATERIALS. 2006;13(2):57–85.
MLA
Samyn, Pieter, L VAN SCHEPDAEL, Wim Van Paepegem, et al. “Fracture Assessment of Carbon Fibre/epoxy Reinforcing Rings Through a Combination of Full-scale Testing, Small-scale Testing and Stress Modeling.” APPLIED COMPOSITE MATERIALS 13.2 (2006): 57–85. Print.
@article{352444,
  abstract     = {Carbon fibre/epoxy rings are used as radial reinforcement for polymer bearing elements with nominal diameter 250 mm functioning under 150 MPa. Full-scale static and dynamic testing revealed no catastrophic failure for loading to 400 MPa, although there was circumferential splitting of carbon fibres at the machined top edge causing counterface wear under sliding. A combined numerical-experimental analysis was applied for design improvement with a representative small-scale qualification test on the real ring geometry, inducing additional stress concentrations compared to ASTM standards. Full-scale modelling revealed high radial-axial shear stresses (33 MPa) in non-hydrostatically loaded zones, while it increased towards 104 MPa under hydrostatic load conditions. The former is the most critical and should be simulated either on a small-scale unidirectional compression test or on a representative short beam shear test, respectively, measuring the radial-axial or radial-tangential shear strength. A relation between both small-scale states of stress was experimentally and numerically studied, experiencing that the composite ring has lower radial-tangential shear stress compared to radial-axial shear stress as a different hydrostatic stress state is observed in the bulk of the composite ring. As a compressive test is however more difficult to perform than a short-beam-shear test, a representative design criterion for shear fracture is determined from failure at 27 kN normal load in a short-beam-shear test. Finally, fracture is avoided by optimising the cross-sectional geometry of the composite reinforcing ring and close control of the processing parameters.},
  author       = {Samyn, Pieter and VAN SCHEPDAEL, L and Van Paepegem, Wim and LEENDERTZ, JS and SUISTER, E and De Baets, Patrick and Degrieck, Joris},
  issn         = {0929-189X},
  journal      = {APPLIED COMPOSITE MATERIALS},
  keywords     = {UNIDIRECTIONAL COMPOSITES,INTERLAMINAR SHEAR-STRENGTH,COMPRESSION STRENGTH,HYDROSTATIC-PRESSURE,ELEMENT,INTERFACE,3-POINT,FIBER,finite elements,full-scale,shear failure,small-scale},
  language     = {eng},
  number       = {2},
  pages        = {57--85},
  title        = {Fracture assessment of carbon fibre/epoxy reinforcing rings through a combination of full-scale testing, small-scale testing and stress modeling},
  url          = {http://dx.doi.org/10.1007/s10443-006-9007-x},
  volume       = {13},
  year         = {2006},
}

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