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Experimental and analytical techniques are employed in the present study to identify a damage parameter with the acoustic emission signature in woven glass fiber reinforced composite under tensile loading. The damage parameter is estimated by the use of stereological methods and its relation to acoustic emission monitoring is enlighted.

A general constitutive equation for steady-state creep deformation is presented based on the concept of dissipation potential. The material parameters required to characterize the stationary static creep behaviour of an orthotropic composite are obtained from the unidirectional tension creep tests and biaxial tension—shear creep tests performed on a glass—xylok woven fabric composite. If an oscillatory load is superimposed on a sustained loading the steady creep rate changes depending on the oscillatory frequency. This effect is shown by conducting biaxial tests with the shear force possessing both static and dynamic components. In order to describe the alteration of the creep rate in the presence of dynamic fluctuations the static dissipation potential is modified to take account of the frequency effects.