Bending response of Kevlar 49/epoxy beams and rings

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6774743

Reedy, Jr, E D; Guess, T R

Kevlar 49/epoxy laminates often exhibit substantial material nonlinearity when subjected to bending. A unidirectionally reinforced Kevlar 49 lamina is nearly linear elastic to failure in tension, however, in fiber-directed compression, it responds in a perfectly plastic-like manner once a compressive strength of roughly 20% of its tensile ultimate strength is exceeded. This combined linear tensile/nonlinear compressive behavior is the source of Kevlar 49/epoxy's flexural nonlinearity. Since Kevlar 49 reinforced laminates can often carry bending loads well above those needed to cause initial compressive yield, it is desirable to be able to predict the post-yield flexural response. In this presentation, analyses that utilize a simple idealization of compressive yielding are described and calculated results for Kevlar 49 reinforced beams and rings are compared with available data. 2 refs., 3 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6774743
• Report Number(s): SAND-88-2670C; CONF-8810151-5; ON: DE89000637
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ARAMIDS
BEAMS
BENDING
COMPRESSION STRENGTH
EPOXIDES
FINITE ELEMENT METHOD
FLEXURAL STRENGTH
LAYERS
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
RINGS
SYNTHETIC MATERIALS