Evaluation method for the adhesion strength of vitreous enamel

A new quantitative evaluation method and the formula for vitreous enamel we re proposed. The three-point bending strength was measured by loading on th e superposition of test piece which sandwiched glass layer partly between t wo steel sheets. The adhesion strength (sigma) was calculated using the fol lowing equation, sigma = 3PLh/2b.Eg/{Egh(3) + Es(h'(3) - h(3))}w here, P; b ending strength, L; length of span, b; width of glass layer, Eg; Young's mo dulus of glass, Es; Young's modulus of steel, h; thickness of glass layer, h'; thickness of superposition of test piece. The evaluation method for vit reous enamel of this experiment agreed with the empirical evaluation and ma y be applied to an actual situation. (C) 1999 Kluwer Academic Publishers.