Ultrasonic anisotropy measurements and the mechanical properties of polymeric materials

Abstract

The paper considers the usefulness of ultrasonic measurement for monitoring the properties of commercially processed material. It can be applied nondestructively for quality control; or by taking sections, full measurement of anisotropy can be made. The methods are exemplified by results for moulded and solid-state-formed polypropylene; and a full 5 MHz elastic measurement has been performed in one case. The relationship of the 5 MHz moduli to those obtained by more usual techniques is also considered; and the possibility of correlation with tensile and impact results. It is felt that the technique will have growing commercial importance.

Mechanical anisotropy in biaxially oriented polyvinyl chloride

“…. , 6 ( 5 ) While an isotropic solid has only two independent elastic moduli ( c l l , c~~) , solids with hexagonal or orthorhombic symmetry have five ( c l l r c 3 3 , c12, C13, c44) or nine ( C I I , CZZ, ~3 3 , ~1 2 , c23, cl3, ~44, ~5 5 , c66) independent elastic moduli, respectively.…”