Abstract
Transverse strength of various shapes and sizes of kaolin, sillimanite, alumina and zircon test specimens, fired to varying temperature, was determined in an attempt to understand the significance of ‘stressed area’ in such determinations. A large portion of the test pieces was subjected to a maximum bending moment by a two-point loading system for determining the transverse strength and the trend of average results appeared to depend on the probability of having maximum stress at the ‘most dangerous’ flaw, thus the results showed an increase with the decrease in length and diameter or thickness of the test specimens. Transverse strength of the circular specimens was greater than that of the square specimens of similar thickness possibly because the maximum stress in the latter case acted on an area rather than on a line as in the case of a circular specimen. The sizes of the test specimens were so chosen that the ratio of the span used for testing thickness of specimen varied between 5 and 30. The experimental results of any batch could not, however, be correlated with such changes in span thickness ratio.
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