336 Textiles for Industrial Applications
© 2008 Taylor & Francis Group, LLC
to the test specimen. The xture comprises four blocks clamped in pairs to
either end of the test specimen. The surfaces of the xture blocks in contact
with the specimen are roughened to increase the effective coefcient of fric-
tion and hence the shear load transfer. The ratio between shear and end load-
ing is adjusted by the torque applied to the clamping bolts. Because of the
exibility of this test method, many different types of composite materials
may be tested.
Four-point bending test uses exure of a sandwich beam to determine com-
pressive properties. The sandwich beam method comprises a honeycomb-
core sandwich beam that is loaded in four-point bending, placi ...