On the notch sensitivity of flax fibre metal laminates under static and fatigue loading

Damage progression and failure characteristics of open‐hole flax fibre aluminium laminate (flax‐FML) specimens subjected to quasi‐static tensile or tension‐tension fatigue loading were experimentally investigated. Notched and unnotched flax‐FML composites exhibited brittle fracture with little or no...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2018-08, Vol.41 (8), p.1691-1705
Main Authors: Kandare, E., Yoo, S., Chevali, V.S., Khatibi, A.A.
Format: Article
Language:English
Subjects:
Adhesion tests
Aluminum
Computed tomography
Crack propagation
Damage accumulation
damage progression
Fatigue failure
Fatigue life
fatigue modelling
Fatigue tests
Fiber-metal laminates
Flax
flax fibre
FML composite
Notch sensitivity
notch strength
Ultimate tensile strength
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Summary:Damage progression and failure characteristics of open‐hole flax fibre aluminium laminate (flax‐FML) specimens subjected to quasi‐static tensile or tension‐tension fatigue loading were experimentally investigated. Notched and unnotched flax‐FML composites exhibited brittle fracture with little or no fibre pull‐out and minimal delamination at the aluminium/adhesive interface. The flax‐FMLs were tested to failure under tension‐tension fatigue loading conditions (R ratio of 0.1; frequency of 10 Hz; applied fatigue stresses ranging between 30% and 80% of the respective ultimate tensile strength values). The fatigue cycles to failure decreased with the increase in the applied fatigue stress and hole diameter. A phenomenological modelling technique was developed to evaluate the fatigue life of an open‐hole flax‐FML composite. Fatigue tests on specimens subjected to a maximum load equivalent to 35% of the respective tensile failure strength were interrupted at around 85% of the corresponding fatigue life. The accumulated fatigue damage in these specimens was characterised using X‐ray computed tomography. For benchmarking purposes, the fatigue performance and related damage progression in the flax‐FML composite were compared with those of the glass‐FMLs.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12807