. The strength and stiffness of steel under bi-axial loading. I 59 market and made into test specimens. Five specimens were cut fromone tube, numbered 1 to 5 inclusive; these constitute Series specimens were cut from the other tube, numbered 6 to 9 in-clusive, which constitute Series 3. There was some difference inthe physical properties of the material of the two tubes, as maybe seen from Figure 31 which gives the average stress-straindiagrams of the tensile tests on specimens cut from the specimens were first bored out for the entire length andafterward turned down to the
. The strength and stiffness of steel under bi-axial loading. I 59 market and made into test specimens. Five specimens were cut fromone tube, numbered 1 to 5 inclusive; these constitute Series specimens were cut from the other tube, numbered 6 to 9 in-clusive, which constitute Series 3. There was some difference inthe physical properties of the material of the two tubes, as maybe seen from Figure 31 which gives the average stress-straindiagrams of the tensile tests on specimens cut from the specimens were first bored out for the entire length andafterward turned down to the dimensions shown in Figure were not Figure 17 The projections for the gage holes were prepared in thesame manner as for the first tube. The gage holes were drilledby hand, using a No. 54 drill, which is the size that is alwaysused in the laboratory for gage holes. The boring of the tube caused a very slight change ofshape of the walls due to the removal of the inner skin of metal,and after the outside was turned the thickness was uniformlyvarying, usually having two points of maximum thickness diametric-ally opposite and at 90 degrees from these two points of minimumthickness. This slight change in shape was more noticeable in seme tubes than in others and made it impossible to secure uniformthickness without further careful work. 60 6. Method of Testing. Two steel castings were designed to fit over the ends ofa tube. (See Figure 19). Material was ordered with an ultimatestrength of 80,000 pounds per square inch, but the stresses theheads had to carry were comparatively low, for the maximuin loadwas but 102,100 pounds,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1915
