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Validated micro mechanics models

Extended damage mechanics modelling is used to describe the fatigue damage in polymer composite materials

The measurements of the stiffness degradation are used to determine the corresponding internal state variable function experimentally. The relationships between particular ISV and corresponding stiffness degradation is formulated for considered damage mechanism.

It was observed experimentally that the normalized stiffness degradation of conditioned and reference materials are rather close, and are approximated with the same polynomial.

The progressive fiber fracture is considered as main contributing mechanism. The outlined micromechanics methods gives possibilities to study the interface strength and debond crack growth effects on formulated damage tensor.

The continuum damage mechanics approach is used to characterize the damage evolution in long fiber-laminated composites.

The internal state variable evolution law associated with damage in fiber direction is formulated in terms of used theory, and determined experimentally and theoretically.

The theoretically and experimentally determined evolution law of internal state variable is used in damage dependent constitutive relationships for laminate in order to predict the static strain - stress behaviour of arbitrary laminates.

A methodology is proposed to measure the values of the internal state experimentally. The FEM analysis and Monte Carlo simulations are used in order to predict the internal state variable according to the outlined theoretical formulation. The predicted values of internal state variables are compared with experimental results.

Informations connexes

Reported by

Risoe National Laboratory
Risoe National Laboratory
4600 Roskilde