グラスライニング材の強度試験法

概要

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To evaluate the strength of porcelain enamel, it is useful to examine a new evaluation method, which considers the fracture criterion of the surface glass layer and the interface bonding strength between the layers and based steel plate. The steel ball dropping test heretofore in use, due to the effect of specimen dimension and the cramping method of specimen, does not precisely reflect the influence of sintering temperature. The steel ball indentation test is combined with AE method to confirm the estimation of initiative load of ring crack, which occurs on glass surface. Furthermore, for the spherical indentation model with a cone crack, FEM analysis is possible to estimate the interface crack initiation of porcelain enamel. This is done by using the observed propagate direction in the cone crack and by determining experimental fracture toughness through SLJ and DCB specimens. This initiation load was estimated to be near the initiative load of ring crack when using the AE method. It is possible to evaluate the strength of porcelain enamel using the steel ball indentation and AE method.
2004-12-25