Fatigue cracks in fibre metal laminates in the presences of rivets and cold expanded holes

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Proceedings titleConference Proceedings of the Society for Experimental Mechanics Series
Conference2010 Annual Conference on Experimental and Applied Mechanics, 7 June 2010 through 10 June 2010, Indianapolis, IN
Pages541548; # of pages: 8
SubjectAerospace field; Cold expansion; Cold expansion process; Comprehensive research; Digital image correlations; Expanded holes; Failure mechanism; Fatigue cracks; Fiber metal laminates; Fibre Metal Laminates; Manufacturing techniques; Material designs; Measurement techniques; Residual strains; Standard grades; Thermoelastic stress analysis; Cracks; Fatigue crack propagation; Image analysis; Laminates; Mechanics; Riveting; Strain; Strain measurement; Stress analysis; Thermoelasticity; Fatigue of materials
AbstractIn order for new composite materials like fiber metal laminates (FML) to gain acceptance in the aerospace field, it is important to understand the effect on them of common manufacturing techniques such as riveting and cold expansion. A comprehensive research program was initiated using two advanced strain measurement techniques; digital image correlation and thermoelastic stress analysis, to understand the failure mechanisms in FML materials that had been fatigue cycled after having undergone hole cold expansion or riveting. Prior theoretical work has shown the potential for improvement in fatigue life of FMLs, so one standard grade of FML (FML 4-3/2) and a novel FML variant were manufactured and tested. Thermoelastic stress analysis was employed to measure strains on the mandrel exit face while digital image correlation was used to measure strains on the mandrel entry face in the coupons and additional insight was gained regarding the effect of the cold expansion process and of riveting on fatigue crack growth. The results also highlighted the effect of material design on fatigue life as well as the interaction between residual strains and fatigue crack growth. ©2010 Society for Experimental Mechanics Inc.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271063
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Record identifier7a49ee4d-c563-4e46-9c2b-c1e8ce30db02
Record created2014-03-24
Record modified2016-05-09
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