Broughton, W R (2001) Analytical models for assessing environmental degradation of unidirectional and cross-ply laminates. NPL Report. MATC(A)1

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Abstract

This report provides an assessment of analytical and semi-empirical models that can be used for evaluating the elastic and strength properties of unidirectional and cross-ply laminates exposed to heat and moisture. The models are shown to be applicable to both glass and carbon fibre-reinforced composite laminates. The study considers a number of different approaches; including micromechanics, classical laminate analysis, shear-lag theory, non-dimensional temperature function, Kitagawa power-law and Arrhenius temperature dependence relationships. These different approaches have been used to determine the degree and rate of degradation of stiffness and strength properties of glass and carbon fibre-reinforced composite laminates under tensile, shear and flexure loading conditions. Consideration is given to synergistic or superimposed effects between temperature and moisture.
The report presents results that demonstrate that classical laminate analysis combined with micromechanics can be used to predict the elastic and strength properties of moisture conditioned unidirectional and cross-ply laminates. It also shows that simple empirical models can be used to determine tensile, shear and flexural properties of hot/wet aged unidirectional laminates as a function of temperature and moisture. This assessment was carried out using durability data generated within the “Composite Performance and Design (CPD2) Project – Life Assessment and Prediction” and sourced from published literature.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)1
Subjects:	Advanced Materials Advanced Materials > Polymers
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/1932

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