On the measurement of residual shear stress in scragged torsion bars

Abstract

The layer-removal method for determining the residual shear stress distribution in scragged torsion bars is examined.It is found that thickness of the layer removed is restricted if the 'mean stress a t mean radius' assumption is to be valid. Also, it is shown that the modulus of rigidity used in the Fuchs-Mattson equation is not the conventionally accepted modulus, the use of which can lead to large errors in the calculation of the residual shear stress in the outer layers of material.

Effect of scragging on parameters in viscoplastic model for filled rubber

“…Parameter c controls the limiting behaviour as cR0, in particular the strain at which G' ep asymptotes to the plateau value [given for the secant value by G' ep (0)5Ac 2b ] and the strain at which G'' ep reaches a maximum. For c%c, it can be shown that G'' ep &(3b=8)Ac {b ( c=c) 2 . Figure 3a shows the effect of b on G' ep and G'' ep , and Fig.…”

“…10 In all the graphs (Figs. [2][3][4][5], points and lines represent experimental data and model simulation respectively, with the exception of straight line regression fits to experimental data in Figs. 4c and 6.…”