Carnegie Scholarship Memoirs Volume 6 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ... would occur when very weak impacts are employed. M'William and Barnes7 came to the same conclusions as Seaton and Jude. Further, steel with 0'75 to 0'80 per cent. 1 Bulletin de la SocUti dEncouragement pour VIndustrie Nationale, 1910, Part II., p. 545. 2 Revue de Mitallurgie, 1909, vol. vi. p. 885. 3 Institution of Civil Engineers, 190fi, vol. clxvi. p. 78. 4 Copenhagen Congress of the International Testing Association, 1909, vol. i. Proceedings No. 5. 6 Proceedings of the Institution of Mechanical Engineers, 1904, p. 1135. - Ibid., 1908, p. 889. 1 Journal of the Iron and Steel Institute, 1909, No. I. p. 348. of carbon displays a relatively good resistance not only to rotary bending stresses, but also to repeated shock. Finally, Boudouard 1 notes that the number of vibrations necessary to fracture a bar varies in inverse proportion to the percentage of carbon. Impurities, such as slag, manganese sulphide, &c., are described as injurious both for alternating bending or rotary stresses, and in the case of repeated impacts. In being the last to solidify, and by their contraction at the time of so doing, they leave minute fissures within the steel which become more pronounced on the repetition of stresses (Longdridge,2 Dudley3). Phosphorus and nitrogen have a favourable influence on the resistance to alternating bending stresses (Stromeyer,4 Arnold,5 Stead, and Kommers6), but not to repeated shocks. The presence of nickel and of titanium considerably raises the resistance to alternating bending stresses (Stanton,7 Smith,8 and Lake9), but not to repeated shocks. Occluded hydrogen, on the other hand, is injurious in the case of repeated shocks (Longmuir10). Lastly, if the source of origin of the steel be taken into account, Biard11 shows that, taking as...