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Damage tolerance analysis of a helicopter component

✍ Scribed by U.H. Tiong; R. Jones

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
389 KB
Volume
31
Category
Article
ISSN
0142-1123

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✦ Synopsis

Fatigue critical helicopter components are, in general, subjected to complex high frequency dynamic loading. Due to these high frequencies small flaws can propagate to failure in a short period of time. Consequently, the demonstration of damage tolerance for those components must include the analysis of near-threshold crack propagation, i.e. growth in the low-to-mid stress intensity factor range (DK) regime. To this end this paper presents a fatigue crack growth analysis of a helicopter airframe component, that was used as part of a round-robin study into helicopter fatigue, performed using a non-similitude based crack growth law, termed the Generalised Frost-Dugdale law. The resultant computed crack growth history is in excellent agreement with the measured crack length histories.

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