Static and dynamic performance of notched LDF{trademark}/PEKK composites

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:143587

Whitworth, H A ^[1]; Llorente, S G ^[2]; Croman, R B ^[3]

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1. Howard Univ., Washington, DC (United States). Dept. of Mechanical Engineering
2. Boeing Defense & Space Group, Ridley Park, PA (United States). Helicopter Division
3. E.I. du Pont de Nemours and Company, Wilmington, DE (United States)

Two different quasi-isotropic layups of carbon fiber reinforced PEKK (poly-ether-ketone-ketone) thermoplastic laminates were subjected to tensile static and tensile fatigue loadings. Some of the samples contained holes to access their notch sensitivity. In addition the AS-4 carbon fiber was of a long discontinuous form (LDF{trademark}) and the performance of the LDF{trademark} was compared with continuous fiber reinforcement. The two layups were: (90,0,{+-}45)s and (90,{+-}45,0)s and the specimens had either no hole, one hole, or three holes. These were tested for ultimate static strength and fatigued in tension at approximately 70% of static ultimate strength with R=0.1. The results were compared as to layup, fiber reinforcement type, and notch configuration. In addition the results obtained were compared with some previous work where the layups were (0,90,{+-}45)s and (0,{+-}45,90)s.

• OSTI ID: 143587
• Report Number(s): CONF-930246--; ISBN 0-87339-251-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
DYNAMIC LOADS
FATIGUE
MECHANICAL PROPERTIES
PLASTICS
STATIC LOADS
TENSILE PROPERTIES