Transverse compressive stress-strain behavior of thick Kevlar/epoxy laminates

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5473072

Guess, T R; Ericksen, R H

The room-temperature compressive stress-strain response of quasi-isotropic Kevlar 49 fabric/epoxy composites was studied. Cylindrical specimens with porosity up to 20% were loaded normal to the plane of fiber reinforcement. Sample porosity was an important factor affecting the shape of the compressive stress-strain curve, modulus, strength, strain to failure, and Poisson's ratio. As a porous specimen was loaded in compression the tangent modulus first decreased due to void collapse, and then increased as complete consolidation was approached. Increasing the porosity from 1 to 20% caused: (a) the initial modulus to decrease from 6.0 to 1.4 GN/m/sup 2/; (b) the strength to reduce from 1150 to 580 MN/m/sup 2/; (c) Poisson's ratio to change from 0.15 to 0.06; and (d) the failure strain to increase from 16 to 26%. Most of the axially compressed cylindrical specimens failed along inclined planes by shearing through many layers of fabric. Broken fibers were observed on the fracture surfaces.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5473072
• Report Number(s): SAND-81-1202C; CONF-820340-1; ON: DE82008194
• Resource Relation: Conference: Symposium on compression testing of homogenous materials and composites, Williamsburg, VA, USA, 10 Mar 1982
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARAMIDS
COMPRESSION STRENGTH
ELASTICITY
COMPOSITE MATERIALS
EPOXIDES
STRESS ANALYSIS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
SYNTHETIC MATERIALS
TENSILE PROPERTIES
360303* - Composite Materials- Mechanical Properties- (-1987)
360403 - Materials- Polymers & Plastics- Mechanical Properties- (-1987)