E.R. Galea

Computer base mathematical models describing the aircraft evacuation process have a vital role to play in the design and development of safer aircraft, in the implementation of safer and more rigorous certification criteria and in post mortem accident investigation.

David W. Heoppner, Charles B. Elliot, Mark W. Moesser

This is the final report on the Federal Aviation Administration (FAA) Grant No. 93-G-068 Program conducted by the Quality and Integrity Design Engineering Center (QIDEC), Department of Mechanical Engineering, University of Utah. The program is entitled "The Roe of Fretting Corrosion and Fretting Fatigue on Aircraft Rivet Hole Cracking." A lap joint panel removed from an aircraft used in service was investigated for evidence of fretting induced cracking in and adjacent to the rivet holes. Cracks were found in all of the rivet holes that were inspected. A sensitivity study was conducted to determine the effects of fretting on the fatigue lives of 2024- T3 clad sheet aluminum alloy riveted joint specimerts prepared with either FV or CE rivets using either C-squeeze riveting or a rivet gun with bucking bar riveting procedures. A method was developed to predict coefficient of friction characteristics within a fretted contact during the nucleation of a crack. A finite element method was used to calculate the state of stress at CE rivet locations where fretting-nucleated cracks were observed. The primary conclusion of this grant program is that fretting in riveted joints is a potentially major cause of crack nucleation in aircraft skin structure.

N.L. Messersmith

A combustor burn-through can give rise to a under expanded, sonic or supersonic jet of gases and flames out of the combustor.

E.R. Galea

Computer based mathematical models describing aircraft fire have a role to play in the design and development of safer aircraft, in the implementation of safer and more rigorous certification criteria and in post mortem accident investigations.

R. Tapscott, L.E. Dvorak, E. Jacobson, W. S. Leach, M. Sanders, T. Simpson, L. Speitel, R. Tetla

This report contains a summary of available fire suppression agents, their properties and applicability in the various aircraft applications. Classes of agents, with presently available agents listed are recommended for use in the development of test protocols. The test protocol developed for a class of agents can be used, with minor modifications to test all agents belonging to that class.