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STIFFENING EFFECT OF PORCELAIN ENAMEL ON SHEET IRON: I–II *
Author(s) -
Wolford Don S.,
Selby Glenn E.
Publication year - 1946
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1946.tb11574.x
Subject(s) - enamel paint , materials science , composite material , stiffening , bending , bending stiffness , stiffness
The stiffening effect of porcelain enamel is important in applications involving flat surfaces, such as panels, signs, tabletops, cabinets, refrigerators, and stoves. The purpose of this paper is to report on several investigations evaluating the effect. Bending tests were made on small flat specimens of 18‐ to 28‐gauge sheet iron coated on both sides with porcelain enamel ranging in thickness from 0.004 to 0.025 in. per side. Substantial increases in stiffness reaching as high as 1500% for 28‐gauge steel with 0.025 in. of enamel on each side are shown in comparisons between bare and enameled specimens. The increases in ultimate bending strength range to 500%, but the usable increase is somewhat less. Bending tests were made on porcelain‐enameled corrugated sheets, which showed somewhat smaller increases in stiffness and bending strength due to enameling. The minimum thickness of base metal and maximum thickness of enamel are, of course, governed by practical considerations, such as the resistance necessary against chipping and the ability to maintain flatness during firing, which also depend on shape and proportions of the product. A method is given for computing the bending properties of flat sheets and formed sections by means of the usual formulas of mechanics with correction factors for the porcelain enamel. Conversion curves are shown by which bare and enameled sheets may be compared.