File:American engineer and railroad journal (1893) (14756324851).jpg

Identifier: americanengineer68newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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ng volume. Itmight at first sight be supposed that a bar of uniform plasticextensibility ought to draw out uniformly over its wholelength, but beyond a certain critical point a uniform extensionis almost impossible. In order to illustrate these points in abar of mild steel a diagram had been prepared. The law ofplastic extension is determined by the curve, fixed mathemati-cally the curves of the plastic limit, and it fixed also the break-ing weight per square inch of original area. In regard to thepossibilities of deformation in a bar of nearly uniform extensi-bility, as the plastic limit is approached the slightest irregu-larity in section or in extensibility tends to precipitate theformation of a contracted region, and beyond that limit thefurther extension of the bar and the further contraction of areawill be confined to the same region. For stresses below theplastic limit the probabilities of deformation might be exam-ined by cousideiiug the relative time rates of extension at two
Text Appearing After Image:
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