Enhancing the Environmentally Assisted Cracking Resistance of Aircraft Quality Al Alloy of Type AA7075 Stiffened with Polymer Matrix Composite Using Cerium Chloride Inhibitor

This study explores a methodology to raise environmentally assisted cracking resistance of alclad Al–Zn–Mg–Cu (AA7075) alloy, used in aircraft structures, stiffened with polymer matrix composite asymmetric patch in order to suppress growth of fatigue cracks. Fracture mechanics studies of adhesively...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2018-12, Vol.71 (12), p.3021-3027
Main Authors: Kale, S. S., Raja, V. S., Bakare, A. K.
Format: Article
Language:English
Subjects:
Adhesive bonding
Aging aircraft
Aircraft
Aircraft components
Aircraft structures
Aluminum base alloys
Cerium
Chemistry and Materials Science
Copper
Corrosion and Coatings
Corrosion inhibitors
Crack propagation
Environmentally assisted cracking
Fatigue cracks
Fatigue failure
Fracture mechanics
Growth rate
Magnesium
Materials Science
Metallic Materials
Polymer matrix composites
Polymers
Sodium chloride
Stiffeners
Stress corrosion cracking
Stress intensity
Technical Paper
Threshold stress
Tribology
Zinc
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Summary:This study explores a methodology to raise environmentally assisted cracking resistance of alclad Al–Zn–Mg–Cu (AA7075) alloy, used in aircraft structures, stiffened with polymer matrix composite asymmetric patch in order to suppress growth of fatigue cracks. Fracture mechanics studies of adhesively bonded center-pre-cracked Al alloy specimens having stiffeners were carried out in 3.5 wt% sodium chloride environment to understand the effect of cerium chloride inhibitor on the threshold stress intensity for stress corrosion cracking as well as the second-stage (steady-state) crack growth rate. It was observed that in the peak- and the two-step-aged tempers, the crack growth rate of the alloy reduced by two and a half, and four times, respectively, while the threshold stress intensity increased by 14–15% due to the addition of 1000 ppm of this inhibitor. The study offers a method to enhance significantly life of aging aircrafts stiffened with polymer matrix composite.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-018-1403-z