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Unformatted text preview: 1 2 Hooke 3 4 a(b) 0.002 cd 5 6 7 8 9 10(a)b 11 Anelasticity: In most engineering materials, elastic deformation will continue after the stress application, and upon load release some finite time is required for complete recovery. This time-dependent elastic behavior is known as anelasticity. Design stress: For static situations and when ductile materials are used, design stress, d , is taken as the calculated stress level c (on the basis of the estimated maximum load) multiplied by a design factor, N', that is d = N' c , where N' is greater than unity. d c N' d = N' c N' 1 Ductility: Ductility is a measure of the degree of plastic deformation that has been sustained at fracture. Elastic deformation: Deformation in which stress and strain are proportional is called elastic deformation. Elastic deformation is nonpermanent, which means that when the applied load is released, the piece returns to its original shape....
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This note was uploaded on 10/15/2011 for the course ENG 302 taught by Professor Haitaowang during the Winter '10 term at Tsinghua University.
- Winter '10