. Transactions. cks in the tirewill at once be noted. The results of this investigation showed thatthese failures resulted from two causes: ? First, lack of uniformity in the ingot from which the tire was made. Second, the presence of coarse grains or large crystals in the tire. When a sample containing large crystals suspended in a matrix issubjected to a compression test the large crystals are pressed out of thematrix and when subjected to repeated loads either shell out or developcracks. Figs. 4 and 5 show sections of the ingot from which tires are now manu-factured and their almost absolut
. Transactions. cks in the tirewill at once be noted. The results of this investigation showed thatthese failures resulted from two causes: ? First, lack of uniformity in the ingot from which the tire was made. Second, the presence of coarse grains or large crystals in the tire. When a sample containing large crystals suspended in a matrix issubjected to a compression test the large crystals are pressed out of thematrix and when subjected to repeated loads either shell out or developcracks. Figs. 4 and 5 show sections of the ingot from which tires are now manu-factured and their almost absolute uniformity will be noted from thesephotographs. Generally speaking, all results which we have obtained on fatiguetests show that the material of high elastic limit withstands a greaternumber of rotations under a given fiber stress than material having alower elastic limit, irrespective of elongation or contraction of area. The United States Government made a series of extensive experi- ALEXANDRE MITINSKY 173. Fig. 3.—Test Cylinder Showing Cracks Developed by Compression.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
