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Accelerated testing and associated predictive modeling for characterising durability of composites: a critical review

Broughton, W R; Maxwell, A S; Sims, G D (2021) Accelerated testing and associated predictive modeling for characterising durability of composites: a critical review. NPL Report. MAT 99

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Composites are increasingly being used for applications where long-term or critical requirements require the use of accelerated ageing regimes to ensure the serviceable life of product and components. A trend that is likely to continue for the foreseeable future due to progressive changes in material procurement strategies that require increased product lifetimes in increasingly harsh environments. Consequently, there is growing demand on manufacturers to extend the lifetime guarantees on products, particularly where inspection can be difficult or failure catastrophic. Regulation and stringent product guarantees are also increasingly being demanded for engineering components in consumer products such as cars and washing machines, where consumers often view extended lifetime warranties as a sign of product quality. Whilst the life expectancy of products in non-demanding applications have traditionally been predicted from previous experience, the use of polymeric materials in long-term or critical applications, such as construction, requires a far better understanding of the failure mechanisms to enable lifetime predictions to be made.

This report summarises the degradation mechanisms found in polymeric materials, the accelerated test methods that have been developed and the techniques used for assessing life-time predictions. In addition, annexes cover the results of an industrial survey to determine current practice and the future needs of industry for long-term testing (Appendix 1) and a draft proposal for a Joint Industry Project (JIP) to develop and validate methodologies for ageing of composites (Appendix 2) are presented. Finally, in Appendix 3 an abstract is given for a review of a wider materials modelling approaches including non-composites examples.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MAT 99
Keywords: Durability, Composites
Subjects: Advanced Materials > Composites
Divisions: Engineering
Identification number/DOI: 10.47120/npl.MAT99
Last Modified: 12 Jul 2021 14:52
URI: http://eprintspublications.npl.co.uk/id/eprint/9068

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