By K. E. Easterling

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Extra info for Mechanisms of Deformation and Fracture. Proceedings of the Interdisciplinary Conference Held at the University of Luleå, Luleå, Sweden, September 20–22, 1978

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E. e. visco-elastic. g. e. representative volumes of the material, sufficiently large to be regarded as homogenous; however the viscoelastic response of these domains is derived by means of a stochastic model. g. e. Gaussian, and to remain so in the course of creep under an applied constant stress. e. generally referred to as a "representative volume" ( 2 3 ) . e. the transition from the molecule-space to gas-space or, more concretely, from Maxwell's law of the distribution of the velocities of molecules in a gas to the evaluation of the gas pressure.

Electron transport, in metals, in what may be called the "crisis stage", about 1925 (1). For, just as we have been dealing for many years with the deformation of crystals in terms of isolated dislocations which were "jumping" over isolated energy barriers, and have found this approach to be wanting, so in the mid-twenties the shortcomings of the classical gas-kinetic theory of electrical conductivity advanced in the first decade of this century by Drude, Lorentz and others, in terms of billiard-ball models of classical charged particles, were well known.

4). The results give: t ■ «·■ <τξ ' <«> or, at very low s t r e s s l e v e l s , i . e . 4. Model used to represent Plastic Zone of Length |c-a| (see refs. (4,21,22)). ) (23,24) and the equating of G to σγδ in equation (18) may be thought of in terms of a virtual work calculation where the stress σγ ahead of the crack tip does work by moving through the displacement 6(4). g. le)) yield fairly similar results. 04 (Κ/σγΓ (20) 53 along the X axis. D. 5 K /σ γ Ε As plasticity becomes more extensive, it becomes convenient to characterise the crack tip stress- and displacement-fields by means of a path-independent integral, J, which incorporates both the strain energy stored within any contour Γ, and any work done by surface tractions acting on the contour (26).

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