Testing Methods for Composites

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Presentation transcript:

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 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

Tensile testing Single fiber tensile test Fiber tow or yarn test Composite tensile test

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

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

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

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

Interlaminar shear test Testing method Testing device

Bending test Three point bending Four point bending

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