Testing Techniques for Composite Materials

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Series of powerpoint slides showing several commonly used testing techniques for the characterisation of composite materials. The slides are adapted from the University of Liverpool "Advanced Composite Materials" lectures [MATS411] by Prof. W. Cantwell.

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Testing Techniques for Composite Materials

  1. 1. P<br />Double Cantilever Beam (DCB) test geometry<br />Used to determine mode I failure strength of composite materials<br />δ<br />End block<br />h<br />Pre-crack<br />2h<br />B<br />a<br />P<br />Beam Theory Method:<br />(J/m2)<br />
  2. 2. End Notch Flexure (ENF) test geometry<br />Used to determine mode II failure strength of composite materials<br />a<br />P<br />B<br />Pre-crack<br />2h<br />L<br />L<br />Beam Theory Method:<br />(J/m2)<br />
  3. 3. Mixed-mode (I/II) Interlaminar Fracture test geometry<br />Used to determine mixed mode interlaminar failure strength of composite materials<br />B<br />L<br />a<br />P<br />δ<br />Pre-crack<br />2h<br />Mixed-mode fracture Energy:<br />(J/m2)<br />
  4. 4. Single Cantilever Beam (SCB) test geometry<br />Used to determine skin debonding energy for thick skinned composite sandwich structures<br />B<br />Clamp<br />P<br />Core material<br />Pre-crack<br />Clamp<br />a<br />Mixed-mode fracture Energy:<br />(J/m2)<br />
  5. 5. Centre Notch Flexure (CNF) test geometry<br />Used to determine skin debonding energy for thin skinned composite sandwich structures<br />B<br />P<br />P<br />Hole<br />δ<br />Pre-crack<br />a<br />Mixed-mode fracture Energy:<br />(J/m2)<br />
  6. 6. Interlaminar Shear Strength (ILSS) test geometry<br />Standardised three point bend test used to determine interlaminate shear strength for composite structures<br />P<br />B<br />10mm<br />δ<br />2mm<br />20mm<br />Interlaminate Shear Strength:<br />(J/m2)<br />

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