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The Effect of Laboratory Atmospheric Environmental Parameters on Corrosion Fatigue Damage

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Age-hardenable aluminum alloys are used for many aerospace applications, where high strength and low density are required. In service, these alloys must withstand both demanding mechanical loads and corrosive environmental conditions. For components made of these alloys, problems may occur when mechanical stresses are present with a corrosive environment.

Product Number: 51323-19396-SG
Author: Sarah E Galyon Dorman, Justin Rausch, Nathan Houser, Jenifer S. (Warner) Locke
Publication Date: 2023
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The objective of this project to develop an accelerated environmental fatigue crack test method which can be used to better understand the effects of in-flight and nocturnal/diurnal wetting and drying due to natural temperature and relative humidity changes through a 24-hour day. This method could hopefully be of use for evaluating newer aluminum alloys and corrosion coatings with respect to their effect on environmentally assisted fatigue. This method measures changes in the fatigue crack growth rate to determine the effect of simulated atmospheric environment. Complex wetting and drying effects are known to occur under atmospheric corrosion conditions, it is thought that these conditions also accelerate environmentally assisted cracking.

The objective of this project to develop an accelerated environmental fatigue crack test method which can be used to better understand the effects of in-flight and nocturnal/diurnal wetting and drying due to natural temperature and relative humidity changes through a 24-hour day. This method could hopefully be of use for evaluating newer aluminum alloys and corrosion coatings with respect to their effect on environmentally assisted fatigue. This method measures changes in the fatigue crack growth rate to determine the effect of simulated atmospheric environment. Complex wetting and drying effects are known to occur under atmospheric corrosion conditions, it is thought that these conditions also accelerate environmentally assisted cracking.

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