Towards the Certification of Bonded Primary Fiber Metal Laminate Structures by Bolted Disbond Arrest Features

Towards the Certification of Bonded Primary Fiber Metal Laminate Structures by Bolted Disbond Arrest Features

van Teeseling, Ivar (TU Delft Aerospace Engineering)

Rans, Calvin (mentor)
Alderliesten, Rene (graduation committee)
Kassapoglou, Christos (graduation committee)
Fernandez Villegas, Irene (graduation committee)

Delft University of Technology

Aerospace Engineering

2019-01-07

A new certification approach for bonded primary Fiber Metal Laminate (FML) structures is investigated: using bolts as Disbond Arrest Features (DAF)s to contain the growth of bond line damages so that they can be found and repaired by inspection before becoming critical. By fatigue testing with coupon specimens and model analysis, it has been demonstrated that reducing the Mode I Strain Energy Release Rate (SERR) is the main driver for arrest. The peak stress associated with a disbond front can initiate adherend fatigue cracks during slow growth. The effect of adherend fatigue cracks on the arrest of disbond growth could not be determined and must be investigated in future work. In the process, a novel quasi-analytical disbond growth model has been developed and validated. An algorithm is developed and verified that utilizes the strain field measured by Digital Image Correlation (DIC) to locate the disbonded region.

Fibre Metal Laminates
Fatigue disbond growth
Disbond Arrest Features
Bonded joints
Primary structures
Certification
Experimental
Analytical
Numerical

http://resolver.tudelft.nl/uuid:85b6685a-52c8-4f0f-b05d-9752384a9c1c

Student theses

master thesis

© 2019 Ivar van Teeseling