Abstract
From the point of view of engineering exploitation of materials at high temperatures the following modes of deformation are important: creep, fatigue and interaction of creep with fatigue. From the physical point of view all these modes of high temperature deformation are conditioned by the plastic deformation, i.e. by the generation and motion of dislocations and other defects of the crystal lattice. Macroscopically, the basic difference between the high temperature deformation and the low temperature deformation lies in the degree of the dependence of deformation on time. The low temperature deformation of metals is — in the ideal case — fully timeindependent, the high temperature deformation depends not only on stress and temperature, but always also on time. For example, for a metallic body loaded by a constant stress it holds:
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• for low temperatures ε = f(σ, T) time-independent elastic-plastic behaviour, for high temperatures
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• ε = f(σ, T, t) time-dependent creep behaviour.
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Lukáš, P. (2000). High Temperature Deformation. In: Lépinoux, J., Mazière, D., Pontikis, V., Saada, G. (eds) Multiscale Phenomena in Plasticity: From Experiments to Phenomenology, Modelling and Materials Engineering. NATO Science Series, vol 367. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4048-5_6
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DOI: https://doi.org/10.1007/978-94-011-4048-5_6
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