Fatigue of Cellulose Acetate and Ductile Metals

Abstract

By a theoretical consideration of a viscous body it has been deduced a formula for the description of the fatigue properties of ductile metals and plastic materials. This formula has been compared with experimental fatigue data of Wöhler-curves (S-N curves). For cellulose acetate, iron, copper, nickel, silver, zinc and, to a restricted degree, also for aluminum a sufficient accordance between the experimental data and the theoretical curves has been reached. With this procedure it is possible to determine fatigue limits for these materials. Similar results are obtained for the creep of brass. It is supposed that the cause of the fatigue limit is the near surface stress of the specimen.

A plantar wearable pressure sensor based on hybrid lead zirconate-titanate/microfibrillated cellulose piezoelectric composite films for human health monitoring

“…5c), which damaged the plantar sensors due to the short-circuit formed between the upper and lower electrodes. 64…”

“…5c), which damaged the plantar sensors due to the short-circuit formed between the upper and lower electrodes. 64 As shown in Fig. 5d, to study the sensitivity curve of the PZT/MFC composite with respect to applied pressure, we fixed one end of the film and applied a 10 g mass block at the other end and adjusted the frequency of the vibration exciter to 10 Hz.…”