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Publications
Sobral, J. and Rodrigues, S. (2018), “Reliability of composite materials based on accelerated life tests”, 3rd International Conference on Maintenance Engineering (IncoME 2018), 6-7 September, Coimbra, Portugal, pp. 236-246.
As the demand for reliability information is increasingly frequent, and sometimes mandatory, accelerated life tests are often used to obtain failure da-ta on reduced time to forecast failures over longer usage periods.
The present work describes the main methods usually applied for accelerated life tests, following models such as the Arrhenius model, Eyring model, the Inverse Power Law model and the Temperature-Nonthermal model.
In order to implement the concepts it is presented a case study using a composite material subjected to accelerated UV radiation. A degradation of its mechanical properties was recorded over the exposure time through uniaxial tensile tests. With the results obtained by accelerated life tests it was possible to understand failure behaviour and to describe reliability prognostics for normal operating conditions of such material. The methodology presented in this work can be applied to other materials, components or systems in order to anticipate failures and give a com-plete knowledge of their reliability over time without being necessary to wait for real failure data.
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