Electronic-Controlled Tensile Tester

Part 2; Measuring Self-expanding and -contracting Movements

Abstract

The control mechanism of the electronic universal testing machine to measure the minute expanding and contracting loads or extensions of materials such as “mechano-chemical system” varies with some physio-chemical treatments.
1) When a self-expansion or -contraction is interposed as a disturbance of this control system under a load input type, the self-expanding and -contracting deformations of test pieces can be tested accurately with this tester.
2) Under an extension input, the self-expanding and -contracting loads of test pieces can be tested precisely.
3) Our experimental results show that the transfer function of a “mechano-chemical system” expanding or contracting with fluctuations in pH or in the temperature of a soap solution is obtainable thus: G_MP(s)=K_ph/(T_Prs+1)(T_DcS+1)_??_K_ph/(T_Prs+1) where T_Pr: time constant of permeability T_Dc: time constant of dissociation G_MH(S)=K_He/(T_cos+1)(T_Mes+1) where T_Co: time constant of heat transmission T_Mc: time constant of molecular movement
4) Test results show that a “mechano-chemical system” is quite adequate as a transducer to convert the density of a solution (in this case pH) into an extension or electric voltage.