Accession Number : ADA264898


Title :   Measurement of the Out-of-Plane Shear Response of Thick Section Composite Materials Using the V-Notched Beam Specimen


Descriptive Note : Research and development rept. Oct 90-Sep 92,


Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD


Personal Author(s) : Gipple, K ; Hoyns, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264898.pdf


Report Date : Apr 1993


Pagination or Media Count : 45


Abstract : The out-of-plane shear response of thick, unidirectional and crossply, AS4/3501-6 and S2 glass/3501-6 laminates was investigated theoretically and experimentally. The specimens considered were of the V-notched beam (Iosipescu) configuration. Strains were monitored in the specimen test sections using conventional strain gages, moire interferometry, and new full section strain gages. Crossply laminates exhibited a fairly uniform strain distribution away from the notches resulting in agreement of initial moduli obtained through all three strain measurement methods. Strains measured with conventional gages centered between the notches of the unidirectional specimens exceeded the average strain from notch to notch, as measured by moire interferometry and the full section data. Measured strains correlated very well with predicted strains from specimen finite element analyses using nonlinear elastic material properties.


Descriptors :   *SHEAR PROPERTIES , *COMPOSITE MATERIALS , *LAMINATES , MEASUREMENT , THICKNESS , ELASTIC PROPERTIES , STRAIN(MECHANICS) , GLASS , NONLINEAR SYSTEMS , RESPONSE , STRAIN GAGES , GRAPHITE EPOXY COMPOSITES , TRANSVERSE , UNIDIRECTIONAL , NOTCH SENSITIVITY , MOIRE EFFECTS


Subject Categories : Laminates and Composite Materials
      Mechanics
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE