The influence of thermoplastic film interleaving on the interlaminar shear strength and mode I fracture of laminated composites

Article Abstract:

The interleaving of glass/epoxy laminates with polyethylene terephthalate thermoplastic polyester, having high ductility and low glass transition temperature, increases the delamination cracking resistance. Four-point bending tests show that the interleaving of the composites with the polyester films doubles the load carrying capability. Double cantilever beam tests show that interleaving also increases the Mode 1 fracture toughness. The interlaminar shear strength equation from classical beam theory has to be modified to accommodate the increased film thickness.

Shear (Mechanics), Polyethylene terephthalate

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Analysis of layer waviness in flat compression-loaded thermoplastic composite laminates

Article Abstract:

A finite element method analyzes the impact of layer waviness in flat compression-loaded thermoplastic composite laminates. Inclusion of material nonlinearity slightly reduces the compression strength without affecting the failure mode. Results indicate the presence of a threshold layer wave severity for a particular laminate and loading condition. During compression loading, the fiber compression and interlaminar tension failures are obtained for a moderate layer wave and severe layer wave geometries respectively.

Strains and stresses, Stresses (Materials), Finite element method

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Numerical analysis of deep drawing process for thermoplastic composite laminates

Article Abstract:

A simulation model for the deep drawing process of composite laminates with woven fabric microstructures, based on numerical analysis including flow, heat transfer and residual stress, has been developed. A power-law constitutive model characterized the processing rheology of the composites, and a three-dimensional finite element method was developed to simulate thermoforming and cooling. The method can predict macroscopic and microscopic deformation mechanics during the thermoforming process.

Testing, Numerical analysis, Thermoplastics

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