Ch2_Strain - St r ain EM CH 213 I mpor t ant Concept s Nor...

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Unformatted text preview: St r ain EM CH 213 I mpor t ant Concept s Nor mal St r ain Shear St r ain Signs and Unit s Nor mal St r ain Nor mal St r ain--Rat io of defor mat ion of a line segment per unit lengt h: 1 2 I n t he limit , t he nor mal st r ain becomes Gener ally is gener ally found exper iment ally, t hus t he new lengt hs of a shor t line segment is: Shear St r ain Shear St r ain--t he r at io of defor mat ion per pendi cul ar to a l i ne segment to the or i gi nal l ength: Assumi ng that i s ver y smal l , Tan . Thus, your book defi nes shear str ai n as: 5 3 4 Signs and Unit s Nor mal st r ain is posit ive for t ensile defor mat ion and negat ive for compr essive defor mat ion Shear st r ain is posit ive if and negat ive when Bot h nor mal and shear st r ain ar e r at ios of lengt h, t hus t hey ar e dimensionless. You may seem t hem wr it t en as per cent s or wit h unit s (lengt h/lengt h) Final not e: Nor mal st r ain causes a change in volume, while shear st r ain causes a change in shape ...
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Ch2_Strain - St r ain EM CH 213 I mpor t ant Concept s Nor...

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