Measurement of the Out-of-Plane Shear Response of Thick Section CompositeMaterials Using the V-Notched Beam Specimen

摘要

The out-of-plane shear response of thick, unidirectional and crossply, AS4/3501-6and 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.