Accession Number : ADA313646
Title : Dynamic Inelasticity of Polymer-Matrix Composites.
Descriptive Note : Final rept. Apr-Oct 95,
Corporate Author : PURDUE UNIV LAFAYETTE IN
Personal Author(s) : Espinosa, Horacio D.
PDF Url : ADA313646
Report Date : 16 MAY 1996
Pagination or Media Count : 37
Abstract : A novel experimental configuration that can record projectile velocity histories and target back surface out-of-plane motion in penetration experiments has been developed. The technique was used to investigate failure mechanisms during ballistic impact of an S-2 glass fiber woven composite with 60% fiber volume fraction. Microscopy studies performed on recovered samples clearly show interply delamination, fiber breakage, ply inelasticity, and fiber kinking as the major failure modes in these composites. Recorded penetrator velocity histories indicate these failure mechanisms are rate dependent. Pressure-shear recovery experiments were performed to investigate the out-of-plane dynamic shear resistance of the composite. Microstructural analyses revealed that at low impact velocities, 2 GPa compressive stresses, matrix cracking and matrix-fiber debonding are the primary damage mechanisms. At higher impact velocities, 4 GPa compressive stresses, fiber microcracking becomes pronounced.
Descriptors : *DYNAMICS, *POLYMERS, *COMPOSITE MATERIALS, *ELASTIC PROPERTIES, *MATRIX MATERIALS, *GLASS FIBERS, SHEAR PROPERTIES, STRESSES, VELOCITY, MICROSTRUCTURE, IMPACT, DAMAGE, PROJECTILES, RESISTANCE, STRUCTURAL ANALYSIS, CRACKING(FRACTURING), FAILURE, MICROSCOPY, LOW VELOCITY, PENETRATION, BALLISTICS, COMPRESSIVE PROPERTIES, MICROCRACKING.
Subject Categories : Polymer Chemistry
Ceramics, Refractories and Glass
Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE