INFLUENCES OF MEASURING PRESSURE UPON SNAP GUAGES (Report 2)

The behavior of the plain snap gauge of Epoxy Resin under the tension load are studied qualitatively by photoelastic showing the fringe order, the isochromatic lines and the isoclinics. As the results, the distribution curves of the fringe order are greatly influenced by the length, the width and the shapes of the gauge arm. Some singular points are observed in an U notch type, and double notch type has one more singular point compare with a single notch type. The expanse of several types in practical materials under the tension load are measured by strain meter and micro meter. As the results the authors find that U notch type has minimum value in testing pieces.