GLG 301 Lecture Notes - Lecture 18: Rheology, Shear Modulus, Oceanic Crust

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28 Mar 2017
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Non-linear and plastic behavior: most materials are not linear in their behavior and not purely elastic or viscous. May be dependent, stress or strain-rate, temperature, pressure, etc. E (young"s modulus), g (shear modulus), or (cid:536) (viscosity) are stress or strain dependent thus stress-strain (-strain rate) relationship is not a constant (i. e. , non-linear: yield strength (or yield stress or yield point) (elastic limit) Material stops behaving elastically and starts to behave viscously (visco-elastic or plastic behavior although (cid:536) need not be constant) above this point. Lithosphere (lithos greek rock or stone: rigid ((cid:536) = 2 x 1022 pa-s), largely elastic portion of earth with conductive heat transfer. Includes crust and upper mantle lid. corresponds to. Plate. : generally considered 50-100 km thick under the oceans and 100-200 (maybe up to 300) km thick under the continents, different definitions exist. Seismic above low velocity zone; corresponds to 1000 c isotherm.

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