Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

00303 CORROSION FATIGUE CRACK GROWTH BEHAVIOR AND AIRCRAFT STRUCTURE LIFE TIME PREDICTION

Picture for 00303 CORROSION FATIGUE CRACK GROWTH
Available for download
Product Number: 51300-00303-SG
ISBN: 00303 2000 CP
Author: Vinod S. Agarwala, A. Basir Shafiq
$0.00
$20.00
$20.00
Considerable amount of research has been performed in the area of lifetime assessment of aircraft (structural) materials; however, a methodology or a model is yet to surface that would accurately predict lifetime of an aircraft structure serving in aggressive environment. Literature survey reports some trends but many conflicting opinions (results) as well, which reduces confidence level in lifetime prediction. Some experimental results reported in this paper suggest that corrosion, even though a time dependent phenomenon plays a vital role in affecting fatigue crack growth rates when there arre active corrosion cells present. These rates are much higher than those obtained under pure fatigue induced crack growth rates. Up to an order of magnitude increase in the crack growth rates for specimens tested in aggressive environment as compared to those tested in air were observed. It was also found out that pre-corrosion is only significant during the crack initiation stage. Crack growth beyond initiation is independent of the nature and extent of crack tip pre-corrosion. A methodology for a mathematical model based on the superposition of corrosion (diffusion) mechanisms and fatigue crack growth rate is suggested and is expected to yield reasonable corrosion fatigue crack growth rate estimates. Any technique that can modify crack-tip processes would influence the life of structure. A chemical inhibitor system based on dichromate, nitrite, borate and molybdate (DNBM) quaternary complexes has been shown to be quite effective in retarding the crack growth rates resulting in a significant increase in life. Application of these inhibitors has shown to increase the lifetime by a factor of five. Keywords: corrosion fatigue, life prediction, crack growth rate, pre-fatigue corrosion, active corrosion cells, crack-tip corrosion mechanism, inhibitors, corrosion superposition model.
Considerable amount of research has been performed in the area of lifetime assessment of aircraft (structural) materials; however, a methodology or a model is yet to surface that would accurately predict lifetime of an aircraft structure serving in aggressive environment. Literature survey reports some trends but many conflicting opinions (results) as well, which reduces confidence level in lifetime prediction. Some experimental results reported in this paper suggest that corrosion, even though a time dependent phenomenon plays a vital role in affecting fatigue crack growth rates when there arre active corrosion cells present. These rates are much higher than those obtained under pure fatigue induced crack growth rates. Up to an order of magnitude increase in the crack growth rates for specimens tested in aggressive environment as compared to those tested in air were observed. It was also found out that pre-corrosion is only significant during the crack initiation stage. Crack growth beyond initiation is independent of the nature and extent of crack tip pre-corrosion. A methodology for a mathematical model based on the superposition of corrosion (diffusion) mechanisms and fatigue crack growth rate is suggested and is expected to yield reasonable corrosion fatigue crack growth rate estimates. Any technique that can modify crack-tip processes would influence the life of structure. A chemical inhibitor system based on dichromate, nitrite, borate and molybdate (DNBM) quaternary complexes has been shown to be quite effective in retarding the crack growth rates resulting in a significant increase in life. Application of these inhibitors has shown to increase the lifetime by a factor of five. Keywords: corrosion fatigue, life prediction, crack growth rate, pre-fatigue corrosion, active corrosion cells, crack-tip corrosion mechanism, inhibitors, corrosion superposition model.
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 00301 ITALIAN AIR FORCE CORROSION DATA
Available for download

00301 ITALIAN AIR FORCE CORROSION DATA MANAGEMENT

Product Number: 51300-00301-SG
ISBN: 00301 2000 CP
Author: Capt. Mario Colavita
$20.00
Picture for 00302 MULTILAYER GALVANIC CELL FOR NEXT
Available for download

00302 MULTILAYER GALVANIC CELL FOR NEXT GENERATION CORROSION SENSORS

Product Number: 51300-00302-SG
ISBN: 00302 2000 CP
Author: M.D. Jaeger, B.R. Pilvelait, and RJ. Magari
$20.00
Picture for 00308 THE BUREAU OF RECLAMATION AND PRACTICAL
Available for download

00308 THE BUREAU OF RECLAMATION AND PRACTICAL APPLICATIONS IN DESALINATION AND MEMBRANE SEPARATION TECHNOLOGIES

Product Number: 51300-00308-SG
ISBN: 00308 2000 CP
Author: Myriam J. Fabien
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support