3D Hybrid Ballistic Testing Using a 3D Digital Image Correlation System (2)
Dagher, H. J.
Publication Name: COMPOSITES 2010
Conventional strain measurements used in material tests include surface-bonded resistive strain gages, extensometers, and linear variable differential transducers (LVDTs). Conventional measurements typically provide single measurements of strains and displacements at selected locations and gage lengths. The main issues associated with using conventional measurements in fabric material tests are (1) bonding strain gages to the fabric surface is not possible, (2) need to remove extensometers from the specimen prior to failure to avoid damage in the instrument, (3) surface contact requirements, (4) single point information, and (5) transverse sensitivity of resistive strain gages. In addition, typical fabric materials used in blast and ballistic protection systems are in a dry state, which results in surface waviness, non uniform strain fields at the fiber tow locations, and very flexible coupons.