Archive

29 Jul

Effect of Chromate on Corrosion Fatigue in Service Relevant Concentrations

Effect of Chromate on Corrosion Fatigue in Service Relevant Concentrations Sarah E. Galyon Dorman1 Saravanan Arunachalam1 and Scott A. Fawaz1 1SAFE, Inc Abstract: The corrosion protection chromate provides to metallic structures has been well documented. To fully quantify chromate replacement coatings an understanding of the effects that chromate has on corrosion fatigue must be fully

READ MORE
27 Jul

Corrosion Fatigue Pit-to-Crack Test Methodology

Corrosion Fatigue Pit-to-Crack Test Methodology Justin W. Rausch1, Sarah E. Galyon-Dorman1, Scott A. Fawaz1 1 SAFE Inc., United States of America Abstract: The objective of this work was to develop a test methodology for corrosion fatigue that allows researchers to investigate the effects of environmental parameters on crack growth rates of cracks nucleating from corrosion

READ MORE
26 Jul

Structural Restoration Viability Using Cold Spray Technology

Structural Restoration Viability Using Cold Spray Technology Saravanan R Arunachalam and Scott A Fawaz SAFE Inc. 3290 Hamal Cir, Monument, CO 80132, USA Abstract: Cold Spray (CS) Technology has proved to be an effective geometry restoration technology to repair/restore/enhance the airworthiness of aging aircraft. The paper provides a brief review of the literature in the

READ MORE
25 Jul

Using Low Temperature Crack

Using Low Temperature Crack Growth Data in Crack Growth Analyses 11 September 2018 Jason Niebuhr Scott Fawaz SAFE Inc  Mr. Dan Dunmire, Director , OSD-CPO  Dr. Greg Shoales, Director, CAStLE, USAFA  This material is based on research sponsored by the US Air Force Academy under agreement number FA7000-11-2-0011 and FA7000-14-2-0013. The U.S.

READ MORE
24 Jul

The Effect of Corrosion Inhibitors on Fatigue under Complex Environmental Conditions

The Effect of Corrosion Inhibitors on Fatigue under Complex Environmental Conditions Ms. Sarah Galyon Dorman Mr. Justin Rausch Mr. Jason Niebuhr Dr. SaravananArunachalam Dr.Scott A. Fawaz Background Current coating qualification methods do not account for mechanical damage nor representative environments A method for evaluating fatigue crack grow rates under complex atmospheric corrosion conditions could aid

READ MORE
22 Jul

Examination and Prediction of Corrosion Fatigue Damage and Inhibition

Examination and Prediction of Corrosion Fatigue Damage and Inhibition Sarah E.GalyonDorman Justin W. Rausch Saravanan Arunachalam Scott A. Fawaz SAFE Inc. Background Current environmentally assisted fatigue testing methodologies do not account for nucleation from corrosion damage The DoD is moving to ban the use of chromates as a protection system for DoD assets1 The protection

READ MORE
22 Jul

Cold Spray (CS) Repair of Al 7075-T651 Plate for Structural Restoration

Cold Spray (CS) Repair of Al 7075-T651 Plate for Structural Restoration Dr. SaravananR. Arunachalam and Dr. Scott A. Fawaz SAFE Inc. USAF Academy Center for Aircraft Structural Life Extension (CAStLE) Outline ■Introduction ■Factors affecting the CS properties Role of residual stress Material Specimen design and layout Experimental and Results Static Fatigue Corrosion Electrical Conductivity Summary

READ MORE
21 Jul

Effect of Atmospheric Environmental Conditions on Fatigue Crack Growth

Effect of Atmospheric Environmental Conditions on Fatigue Crack Growth J. Niebuhr, S. Galyon Dorman, S. Fawaz SAFE, Inc. ABSTRACT Corrosion has a significant impact on the fatigue of aging aircraft. In service, an airframe will be exposed not only to a spectrum of mechanical loading due to variations in flight profile and mission types, but

READ MORE
25 Jun

The Effect of Bacteria on Corrosion Fatigue in AA7075

The Effect of Bacteria on Corrosion Fatigue in AA7075 Sarah E. Galyon Dorman SAFE, Inc 3290 Hamal Circle Monument, CO 80132 United States Sarah E. Collins CAStLE-United States Air Force Academy 2354 Fairchild Dr, Suite 2J2 USAF Academy, CO 80840 United States Benjamin K. Hoff CAStLE-United States Air Force Academy 2354 Fairchild Dr, Suite 2J2

READ MORE
25 Jun

The Effect of Corrosion Inhibitors on the Corrosion Fatigue of Aircraft Aluminum Alloys

The Effect of Corrosion Inhibitors on the Corrosion Fatigue of Aircraft Aluminum Alloys Sarah E. Galyon Dorman SAFE, Inc 3290 Hamal Cir Monument, CO 80132 United States Scott A. Fawaz SAFE, Inc 3290 Hamal Cir Monument, CO 80132 United States ABSTRACT Corrosion fatigue is an area of concern for the United States Air Force (USAF)

READ MORE