Improved Barriers to Turbine Engine Fragments: Final Annual Report

This final annual technical report describes the progress rnade during year 4 of the SPI International Phase II effort to develop a computational capability for designing lightweight fragment barriers for commercial aircraft. Fabrics of high-strength polymers have proven to be excellent candidates f...

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Bibliographic Details
Main Authors: Shockey, Donald A, Erlich, David C, Simons, Jeffrey W
Format: Report
Language:English
Subjects:
AIRCRAFT ARMOR
AIRCRAFT ENGINE FRAGMENTS
AIRCRAFT ENGINES
AIRCRAFT EQUIPMENT
AIRCRAFT INDUSTRY
BALLISTIC FABRIC
COMMERCIAL AIRCRAFT
Computer Programming and Software
COMPUTERIZED SIMULATION
DAMAGE
DATA BASES
DYNAMIC TESTS
EFFICIENCY
FAILURE(MECHANICS)
FRAGMENT BARRIERS
FRAGMENTS
HIGH STRENGTH
HIGH STRENGTH POLYMERS
IMPACT TESTS
Jet and Gas Turbine Engines
JET ENGINES
LIGHTWEIGHT ARMOR
MATHEMATICAL MODELS
MICROSTRUCTURE
PBO ARMOR
PBO(POLYBENZAZOLES)
POLYMERS
RIGIDITY
STIFFNESS
TENSILE PROPERTIES
TEXTILES
TURBINE ENGINES
TURBINES
ZYLON
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Summary:This final annual technical report describes the progress rnade during year 4 of the SPI International Phase II effort to develop a computational capability for designing lightweight fragment barriers for commercial aircraft. Fabrics of high-strength polymers have proven to be excellent candidates for these barriers. Previous large-scale fragment impact testing of comer peg-mounted fabric barriers indicated that the failure of the fabric around the pegged hole was a significant factor in the barrier's effectiveness. Thus, SRI designed and irnplemmted a laboratory test to characterize fabric failure behavior in the vicinity of a pegged hole. A series of these fabric corner failure tests in both Zylon and Kevlar fabrics determined that significant energy can be absorbed in corner tearing. These tests also showed the effects of various parameters on this energy. SRI then performed a second series of large-scale fragment impact tests at its remote test site, using stand-alone fabric barriers aftached to a rigid frame through pegs near the four comers. The pegged comer holes were positioned far enough from the fabric edges to allow significant comer tearing without complete comer detachinent. Tests revealed a relatively small effect of fragment roll angle and a large effect of impact location (with respect to the center of the barrier) upon the ballistic efficiency of the barrier. In some cases, Keviar could be as effective as (or more effective than) Zylon, due to the larger fraction of impact energy consumed in producing comer tearing. A considerable database of large-scale fragment impact tests into Zylon and Kevlar fabric ballistic barriers is now available for fabric computational model refinement and verification. A simplified finite element fabric model has been developed for use as a design tool for choosing or evaluating parameters for fragment barriers. --Original contains color plates: All DTIC reproductions will be in black and white.