MECHENG 382 Lecture Notes - Linear Elasticity, Electronic Signatures In Global And National Commerce Act, Viscosity

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Combined modeling of creep, elastc and plastic defromation: total strain consists of elastic + plastic +creep component. Total = elastic + plastic + creep: for uniaxial case: elastic = /e; plastic = a n ; d creep dt = o n. O: represented by a spring, dash-pot and friction element. Assume that an alloy with a modulus of 100 gpa exhibits steady-state power-law creep of s-1, where q = 160 kj/mole, An applied uniaxial stress of 30 mpa is applied. H = 7. 4 10 10 h. Creep rate with = 30 mpa at 600 c: = 4. 75 10 12 s 1 d elastic dt. O = elastic + creep d o dt = d o dt = d /e dt d creep dt. + 7. 4 10 10 5 exp q/rt s-1 ( in mpa) d o dt = 4. 75 10 12. But if = 30 mpa & independent of time: O = 4. 75 10 12t + 0( )

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