Study of Strains Between Enamel and Iron as Related to Physical Properties of Each

Abstract

The test methods used for measuring strains between enamel and iron are reviewed. The values obtained by each of these methods, as determined from the mechanics involved in producing the strains, are correlated with experimental data reported in the literature. The strains obtained from the split‐ring test are expressed in terms of the variables of enamel‐iron thickness and modulus of elasticity. These variables are graphically presented by means of a nomograph. Based on the strains obtained from the split‐ring test, a method is presented whereby the stresses responsible for the strains may be calculated. By determining the movement of a split ring under one condition of enamel‐iron thickness, the compressive forces developed within the enamel of different thicknesses and applied to various thicknesses of iron may be calculated.