Identifier: strengthstiffnes00beck_0 (find matches)
Title: The strength and stiffness of steel under bi-axial loading
Year: 1915 (1910s)
Authors: Becker, Albert John
Subjects: Steel bars Axial loads Steel, Structural Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ese curves. The place of greatest stress is evidently a smallarea near each corner and to get the maximum stress would requirea very short gage line. This stress condition is an indicationof a condition due to the form of the specimen rather than to acondition of combined stress. No further use was made of the data cf these tests (SeeTables I to VI) because the non-uniformity of stress distributionrendered a comparison with tension tests uncertain and anyconclusions drawn from such a comparison would be misleading.Table VII gives the applied stresses calculated on the basis of thebending moment, neglecting any increase in width of section at themiddle. The computation was based upon the usual beam formulaand takes no cognizance of the influence of another stress atright angles. 3, Preliminary Tube Tests.The failure of the bending tests to give definite resultsled to the adoption of tubes which were to be subjected to axialcompression or tension and hydrostatic pressure to produce hoop
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51 tension. This method gives two principal stresses at right anglesto each other, the third stress being small since it varies fromthe intensity of the hydrostatic pressure on the inside to zeroon the outside. It had been hoped to use tubes about twelve inch-es in diameter, but the cost was prohibitive, so a compromiseselection resulted in the adoption of 6 inch tubes with J inchwalls. The thickness of the tubes when finished varied between.082 inches and .093 inches, as the average thickness at a givencross section. To determine the value of this type of specimen^a singletube was prepared, 2 feet 2 inches long by 5.50 inches internaldiameter. The tube was threaded on the two ends with a taperthread of twelve threads per inch over a length of 3 inches, andthe ends faced. The remainder of the tube was turned down toan approximate thickness of 3/32 inch, leaving four bands off inch width having a pitch of four inches, symmetrically placedalong the tube. The greater part of these bands

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