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When a porcelain enamel or glass coating is fused to a steel base, two materials of quite different natures are brought together. The metal base (usually low-carbon iron or steel) is a ductile, crystalline material with a relatively high modulus of elasticity, high tensile strength, and high percentage elongation before failure in tension. Glass, on the other hand, is amorphous and brittle; it has no yield point and a relatively low modulus of elasticity and low tensile strength in the massive form. It has a low percentage elongation before failure in tension. Glass has a high compressive strength compared to tensile strength in massive form (as contrasted to glass fibers which have high tensile strength), and when this property is used to good advantage glass can exhibit unusual resistance to stress and thermal shock. Recognizing that there is such a wide difference in physical properties between glass and steel, this investigation was carried out to study some of the tensile properties of glass coating or porcelain enamel coating on steel tension specimens, particularly to learn the relationship between the yield point of the steel and the stress and strain required to cause the porcelain enamel coating to crack.
Deringer, W. A.
Director, A. O. Smith Corp., Milwaukee, Wis.