Nonlinear viscoelasticity and viscoplasticity of flax/polypropylene composites

Article Abstract:

The fracture surface of a specimen that experienced creep rupture at 24 MPa is investigated using a scanning electron microscope. It is demonstrated that the studied flax/PP composites which have a complex microstructure, with mainly in-plane fibers oriented preferentially in the direction of the specimen axis, and nonlinear time-dependent behavior of both constituents, can be successfully analyzed using the theory developed by Scahapery.

Usage, Scanning electron microscopes

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Optimal cool-Down in linear and nonlinear thermoviscoelasticity and the effects of initial stress

Article Abstract:

The minimization of residual thermal stresses in geometrically constrained adhesive layers and thin polymeric composite lay-ups is discussed, with emphasis on the role of initial stresses. A time-temperature path is followed to achieve optimization that achieves the best counter play between temperature as a stress inducing and a stress reducing agent.

Thermal properties, Thermal stresses

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Average strain in fiber bundles and its effect on NCF composite stiffness

Article Abstract:

The nanocrimp fabric (NCF) composite stiffness and average bundle strain were analyzed using approximate method with different level of complexity. It was found that for stiffness calculations all homogenization methods used in this study have sufficient accuracy considering a three dimensional finite element model as the reference case.

Nanotechnology, Composite materials, Micromechanics, Micromechanics (Engineering)

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