On the bending response of Kevlar 49/epoxy beams and rings

Conference · Sun May 01 00:00:00 EDT 1988

OSTI ID:5219967

Reedy, Jr, E D

Kevlar 49/epoxy laminates often exhibit substantial material nonlinearity when subjected to bending. This is a consequence of the yeild-like behavior of a Kevlar 49/epoxy lamina in fiber-directed compression. In this paper, 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. First, results of a finite element analysis of a thin, unidirectionally reinforced ring subjected to diametral compression are presented. This analysis uses beam elements that incorporate linear tensile and elastic-perfectly plastic compressive behavior. Then a method used to analyze quasi-isotropic beams tested in four-point bending is discussed. This finite element analysis uses a layered shell element with a lamina constitutive model that permits elastic-perfectly plastic response to fiber-directed compression, but otherwise assumes linear elastic behavior. Comparison of calculated and experimental results corroborate the ability of analyses using a simple compressive yield model to account for much of the observed flexural nonlinearity in Kevlar 49/epoxy beams and rings. 6 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5219967
• Report Number(s): SAND-88-0612C; CONF-880572-1; ON: DE88006824
• Resource Relation: Conference: ABAQUS user's meeting, Newport, RI, USA, 31 May 1988
• Country of Publication: United States
• Language: English

Related Subjects

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