Transverse compressive testing of thick Kevlar/epoxy laminates

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5713382

Guess, T R; Ericksen, R H

A test program was performed to define a suitable geometry for measuring the transverse compressive properties of Kevlar 49 cloth/epoxy composites. Two geometries and strain measuring methods were evaluated: straight-sided cylinders with strain calculated from total platen displacement (includes specimen end effects), and reduced-section cylinders with strain measured in the reduced gage region (no end effects). The straight-sided specimens had length to diameter ratios between 1.1 and 2.7 and were tested with their ends both dry and lubricated. Neither the aspect ratio nor the end condition had a significant effect on measured compressive properties: stress-strain response and strength. At stress levels below failure, the stress-strain curves from the reduced-section samples were in good agreement with the straight-sided specimen data. Curves from both geometries lie within the same scatter band. Strength data from the reduced-section specimen were inconclusive. Based on this study, straight-sided cylinders with aspect ratios between 2.25 and 2.50 were selected as suitable specimens for characterizing the transverse compressive properties of thick Kevlar cloth/epoxy laminates.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 5713382
• Report Number(s): SAND-79-0176C; CONF-791116-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
ARAMIDS
BUILDING MATERIALS
COMPOSITE MATERIALS
COMPRESSION
CYLINDERS
EPOXIDES
FABRICATION
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POROSITY
STRAINS
STRESS ANALYSIS
STRESSES
TESTING
TEXTILES
VOIDS
VOLUME
YIELD STRENGTH