Accession Number : ADA518994


Title :   Particulate Characterization and Control Evaluation for Carbon Fiber Composite Aircraft Crash Recovery Operations


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Ferreri, Matthew R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a518994.pdf


Report Date : Mar 2010


Pagination or Media Count : 107


Abstract : Within the United States Air Force (USAF) Advanced Composite Material (ACM) is gaining an increasing use in military aircraft. With the number of aircraft that have increasingly large amounts of ACM materials, the probability of an incident with one of these aircraft also increases. When such an incident occurs the aircraft needs to be disassembled, removed, and later inspected as part of the accident investigation process. This disassembly process is termed ?Crash Recovery Operations.? Carbon fibers have been shown to be hazardous to human health and a pilot study raised the suspicion that nanosized aerosol may be generated during the cutting of carbon fiber panels. Due to this, a bench top study was conducted to evaluate the effectiveness of several fiber controls. Additionally, an evaluation of a number of direct reading instruments and traditional gravimetric sampling techniques were evaluated to determine a sampling protocol for evaluation composite fibers. A statistically significant (F-value = 0.0001) shift towards larger diameters in the idealized particle size distribution was shown for both wetted water and water controls when compared to a baseline of no control when cutting burnt ACM. Recommendations for future evaluation and control of composite fiber processes were made.


Descriptors :   *CARBON FIBERS , *COMPOSITE MATERIALS , *MILITARY AIRCRAFT , UNITED STATES , RECOVERY , AEROSOLS , HAZARDS , WATER , HEALTH , PANELS , THESES , WETTING , SAMPLING , INSTRUMENTATION , GRAVIMETRY , PILOT STUDIES , INDUSTRIAL HYGIENE , CRASHES , READING , DISASSEMBLY , PARTICLE SIZE , ACCIDENT INVESTIGATIONS , TEST AND EVALUATION , REQUIREMENTS


Subject Categories : Military Aircraft Operations
      Laminates and Composite Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE