Ballistic impact fatigue behavior of spectra fiber-reinforced composites
- Army Natick R D and E Center, Natick, MA (United States)l Science and Technology Directorate
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Engineering Science, and Mechanics
The study examined the penetration failure mechanisms of Spectra fiber-reinforced composites under ballistic impact and assessed the roles played by resin matrix properties in controlling the process of impact damage propagation. In order to observe gradual propagation of damage, a concept of impact fatigue was introduced by subjecting the composite plates to a multiple number of repeated ballistic impact. When the striking velocity of,a projectile was below the ballistic limit, repeated impact resulted in a progressive growth of local delamination until full penetration of the projectile occurs. Preliminary results indicated that the vinyl ester resin matrix composites have a higher ballistic limit and longer impact fatigue life at a given striking velocity than the polyurethane matrix composites. Based on the test results of dynamic mechanical properties, more localized delamination of polyurethane matrix composites was attributed to a greater degree of stress wave attenuation and lower bending stiffness of material system.
- OSTI ID:
- 89827
- Report Number(s):
- CONF-9409291--; ISBN 1-56676-220-0
- Country of Publication:
- United States
- Language:
- English
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