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Testing Methods for Composites

Testing Methods for Composites. Yiping Qiu. Properties of Composites. Mechanical properties Tensile Compression Bending Shear Impact. Properties of Composites. Physical Properties Thermal Electric Environmental Dimensional Stability. Mechanical Testing. Tensile test

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Testing Methods for Composites

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  1. Testing Methods for Composites Yiping Qiu

  2. Properties of Composites • Mechanical properties • Tensile • Compression • Bending • Shear • Impact

  3. Properties of Composites • Physical Properties • Thermal • Electric • Environmental • Dimensional Stability

  4. Mechanical Testing • Tensile test • Purpose of tensile test • To determine the strength, moduli and Poison’s ratio of a composite • For a unidirectional composite, Ex, Ey, Es and nxy • To determine the energy absorption of a composite • It can also be used to assess fatigue properties by cyclic loading of a specimen

  5. Tensile testing • Single fiber tensile test • Fiber tow or yarn test • Composite tensile test

  6. Single fiber tensile test • Purpose • Sample preparation • Testing condition • Sample size or number of specimens • Analysis of results

  7. Yarn tensile test • Purpose • Sample preparation • Yarn as is • Resin impregnated • Testing conditions • Sample size • Analysis of results

  8. Composite Test • Sample size • Specimen shape • Protection of specimen ends • Testing devices: • Machine • Load cell • Strain gauge • Testing condition

  9. Shear test • Interlaminar shear: interlaminar bonding strength • In-plane shear: shear stiffness and strength

  10. Interlaminar shear test • Testing method • Testing device

  11. Bending test • Three point bending • Four point bending

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