Machine for the testing of plastics under bending loads

Abstract

A testing machine developed for the study of the deformational behaviour of plastics under bending loads complements high-accuracy tensile-creep testing machines and provides a more appropriate means for the testing of brittle fibre-plastics composites and plastics sandwich structures. The machine is suitable for applying constant loads and automatically recording the deflections of specimens at several points over periods of up to three months.

Shear stiffness of a glass-reinforced thermoplastic

“…Thus a highly accurate capacitive transducer system, instead of dial gauges, was used to measure deflection (21) and the loading hooks and the load-equalizing beam were made as light as possible so that the preload due to them and the plunger of the transducer amounted to only 8 g compared with the maximum test load of about 300 g. As before, interrupted step-loading was used to obtain 100 s isochronous load-deflection curves.…”