Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Validated engineering model for residual strength prediction

The laminate strength after (partial-lifetime) fatigue is measured at pre-determined life fractions. Apart from providing useful insights in the material strength behaviour, this forms the basis of strength degradation modelling, which can be used in lifetime prediction methods. Using strength degradation models, lifetime prediction can be improved relative to the "classical" Miner damage rule, by taking into account the effect of loading sequence.

The OPTIMAT database contains results from more than 700 tests on two different laminate lay-ups, a unidirectional (UD) material and a multi-directional (MD) glass-epoxy laminate (see OPTIMAT specimen definition). The UD material was tested both longitudinally and transversely. Three R-ratios (R=10, R=0.1, and R=-1) were tested for each material, except where buckling instablity proved a problem. The database includes specimens, which failed prematurely during the fatigue phase of the test as well as the residual strength of surviving specimens at three life fractions (20%, 50%, and 80%). This data forms the basis for the model developments reported in the references.

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OX11 0QX DIDCOT, (Oxon)
United Kingdom
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