The use of load enhancement factors in the certification of composite aircraft structures

Report (1990)

Authors

J. Lameris

Composite materials Certification Structural reliability Full scale tests Fatigue (materials) Life (durability) Load tests Environment effects Plastic aircraft structures Impact tolerances

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Published Date

22-02-1990

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NLR Technical Publication TP 90068 U

Abstract

In the full scale durability and damage tolerance tests of composite aircraft structures, the US and European certification requirements demand among other things that the number of cycles applied are statistically significant and that the influence of the environment has been taken into account. Several certification methods are described which take into account the requirement of having sufficient statistically reliable data. A review is given of the way in which these requirements have been interpreted and applied in four composite aircraft certification programmes, in particular with regard to the application of so called enhancement factors.

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