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  2. Creep (deformation) - Wikipedia

    en.wikipedia.org/wiki/Creep_(deformation)

    In the secondary, or steady-state, creep, dislocation structure and grain size have reached equilibrium, and therefore strain rate is constant. Equations that yield a strain rate refer to the steady-state strain rate. Stress dependence of this rate depends on the creep mechanism. In tertiary creep, the strain rate exponentially increases with ...

  3. Viscoelasticity - Wikipedia

    en.wikipedia.org/wiki/Viscoelasticity

    When subjected to a step constant stress, viscoelastic materials experience a time-dependent increase in strain. This phenomenon is known as viscoelastic creep. At time , a viscoelastic material is loaded with a constant stress that is maintained for a sufficiently long time period. The material responds to the stress with a strain that ...

  4. Larson–Miller relation - Wikipedia

    en.wikipedia.org/wiki/Larson–Miller_relation

    F.R. Larson and J. Miller proposed that creep rate could adequately be described by the Arrhenius type equation: = / Where r is the creep process rate, A is a constant, R is the universal gas constant, T is the absolute temperature, and is the activation energy for the creep process.

  5. Damage mechanics - Wikipedia

    en.wikipedia.org/wiki/Damage_mechanics

    L. M. Kachanov [5] and Y. N. Rabotnov [6] suggested the following evolution equations for the creep strain ε and a lumped damage state variable ω: ˙ = ˙ ˙ = ˙ where ˙ is the creep strain rate, ˙ is the creep-rate multiplier, is the applied stress, is the creep stress exponent of the material of interest, ˙ is the rate of damage accumulation, ˙ is the damage-rate multiplier, and is ...

  6. Creep-testing machine - Wikipedia

    en.wikipedia.org/wiki/Creep-testing_machine

    Creep is dependent on time so the curve that the machine generates is a time vs. strain graph. The slope of a creep curve is the creep rate dε/dt [citation needed] The trend of the curve is an upward slope. The graphs are important to learn the trends of the alloys or materials used and by the production of the creep-time graph, it is easier ...

  7. Viscoplasticity - Wikipedia

    en.wikipedia.org/wiki/Viscoplasticity

    The classical creep curve represents the evolution of strain as a function of time in a material subjected to uniaxial stress at a constant temperature. The creep test, for instance, is performed by applying a constant force/stress and analyzing the strain response of the system.

  8. Strain-rate tensor - Wikipedia

    en.wikipedia.org/wiki/Strain-rate_tensor

    A two-dimensional flow that, at the highlighted point, has only a strain rate component, with no mean velocity or rotational component. In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the strain (i.e., the relative deformation) of a material in the neighborhood of a certain point, at a certain moment of time.

  9. Kelvin–Voigt material - Wikipedia

    en.wikipedia.org/wiki/Kelvin–Voigt_material

    From these equations we get that in a Kelvin–Voigt material, stress σ, strain ε and their rates of change with respect to time t are governed by equations of the form: σ ( t ) = E ε ( t ) + η d ε ( t ) d t , {\displaystyle \sigma (t)=E\varepsilon (t)+\eta {\frac {d\varepsilon (t)}{dt}},}

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