Internal Friction of Materials
Without understanding the nature and mechanisms of an elasticity and the effect of various factors on internal friction, it is difficult to solve the problems of using internal friction measurement for evaluating the structural stability of alloys, cyclic microplasticity and for better understanding the processes associated with the response of materials to single or repeated loading. The author presents important new results for the relationship between internal friction and the defect of the elasticity modulus with many principal processes such as plastic deformation, effect of temperature of plastic deformation, effects on the structural stability of alloys and composites up to cyclic microplasticity. The existence of critical strain amplitudes is discussed and supported by experiments, and attention is given to the link of cyclic microplasticity with dislocation density and activation volume of plastic deformation up to the effect of individual factors on the cyclic plastic response of the material. The relationship of the process of mechanical fatigue of the material with internal friction and the defect of the elasticity modulus is discussed. The author proposes a new fatigue life equation which has been verified by a large number of experiments.
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FACTORS AFFECTING ANELASTICITY
MEASUREMENTS OF INTERNAL FRICTION AND
N Simpson and I Pearson Prib Nauchn Issled No 4 19 1979
B K Kardasev S P Nikanorov FTT No 13 160 1971
A Puškár Strojirenstvi 2929292929 No 11 684 1979
activation energy activation enthalpy alloys anelasticity annealing changes characteristics coefficient component concentration crease critical strain amplitude crystal cyclic microplasticity cyclic strain curve decrease dependence of internal diffusion dislocation density dislocation segments dislocations displacement effect elasticity moduli enthalpy equation equipment evaluation experimental factor fatigue limit ferrite ferrite grain ferromagnetic FFFFFigigigigig formation frequency of 23 grain boundaries height higher hysteresis loop increase interaction internal fric internal friction background internal friction measurements interstitial atoms iron lattice load cycles loading frequency magnetic field magnetomechanical magnitude martensitic measurements of internal mechanisms metals method microplastic deformation modulus of elasticity number of load obtained parameters perature phenomenon piezoceramic quenching recorded relaxation process resonance saturation shows Snoek solid solutions solute atoms specimen steel stress amplitude structure temperature range tion torsional pendulum total strain amplitude vibrations Young modulus