. Bulletin - United States National Museum. Science. CoLLKt' IN (JKOLOCJY AND M i: I ,ri;(; V. Ifiy ami till' small pirct's, with tli<»s»' ol' a ImiMlrt'd iiiflu-s aln-iidy ^i\«Mi iimlrr si'iics I). Di'scriptioti. I'outractioD or iireii. Lnrce Small Loug Mean. ritiniatAext«iiRtnti. Large Nprtps Small (scrlrs. Tliese results show tla^ hirge specimens, which liehl the highest stress, have contracted h'ast, and the lon^i" specimens, which hcdd tlie lowest stress, have contracted most, thus to some exteat accounting for the difterences in the stress. Series F. To a
. Bulletin - United States National Museum. Science. CoLLKt' IN (JKOLOCJY AND M i: I ,ri;(; V. Ifiy ami till' small pirct's, with tli<»s»' ol' a ImiMlrt'd iiiflu-s aln-iidy ^i\«Mi iimlrr si'iics I). Di'scriptioti. I'outractioD or iireii. Lnrce Small Loug Mean. ritiniatAext«iiRtnti. Large Nprtps Small (scrlrs. Tliese results show tla^ hirge specimens, which liehl the highest stress, have contracted h'ast, and the lon^i" specimens, which hcdd tlie lowest stress, have contracted most, thus to some exteat accounting for the difterences in the stress. Series F. To ascertain the mechanical effects produced on steel plates of various thicknesses by holes, some drilled, others luinched, tests under pull- ing stress were made. The same mateiial as scries I), K, and F was trst«'<l. There are tliree rows of live each <»t' rivet holes, A inches t)etweeii their centers, the pitch of the five holes across the plate being 2A inches. In the fiv«' unannealed plates with drilled holes the loss ol U'lisile strength ranges from to '», the average being per cent.; and those annealed from to , average 24.'.»2 jicr <rent., yield- ing a total average of per cent. The loss in no instance was nearly so great as that representing the material removed, rln- mean being against .'., or (».74 per cent. less. In the live unannealed plates with puiM^hed holes the loss of tensile strength ranges from , the mean being .'~». The greatest loss, , occurs in the ^-inch plate, and is ;). 17 in I he jincli,and least in the ^fjinch jdate, whi(!h the other experiments proved to be the softest of the Ave, and the punching had not acted soinjuriously as in the other two. The loss from punching is not constant, but varies with the thickness and also wirh the hanlness of the mat«M'ial. That. Please note that these images are extracted from scanned page images that may hav
Size: 2355px × 1061px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
