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Engineering and Comp Sci Homework Help
The difference between strain and strain_y
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[QUOTE="1question, post: 4516179, member: 466045"] [h2]Homework Statement [/h2] I am doing a lab. My textbook defines strain as ε= l[SUB]f[/SUB]-l[SUB]o[/SUB] and E = σ/ε. In my lab, E= σ[SUB]y[/SUB]/ε[SUB]y[/SUB]. ε[SUB]y[/SUB] = ΔL[SUB]y[/SUB]/l[SUB]o[/SUB] I do not understand how they can both = ε as l[SUB]f[/SUB]-l[SUB]o[/SUB] is completely different from ΔL[SUB]y[/SUB]/l[SUB]o[/SUB]. ΔL[SUB]y[/SUB] is "elongation at yeild" according to my lab. Why are they both labelled E if they are different? The y subscript, according to the lab, has to do with the yield point. I was under the impression that there was only 1 elastic modulus as after the yield point, stress and strain are no longer proportional and plastic deformation occurs. [h2]Homework Equations[/h2] See above. [h2]The Attempt at a Solution[/h2] I can only conclude I am either missing something or the equations mean the same thing, somehow. [/QUOTE]
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Engineering and Comp Sci Homework Help
The difference between strain and strain_y
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