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  2. Creep (deformation) - Wikipedia

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

    In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are ...

  3. Creep and shrinkage of concrete - Wikipedia

    en.wikipedia.org/wiki/Creep_and_shrinkage_of...

    Creep and shrinkage can cause a major loss of prestress. Underestimation of multi-decade creep has caused excessive deflections, often with cracking, in many of large-span prestressed segmentally erected box girder bridges (over 60 cases documented). Creep may cause excessive stress and cracking in cable-stayed or arch bridges, and roof shells ...

  4. Scope creep - Wikipedia

    en.wikipedia.org/wiki/Scope_creep

    Scope creep (also called requirement creep, or kitchen sink syndrome) in project management is continuous or uncontrolled growth in a project's scope, generally experienced after the project begins. [1] This can occur when the scope of a project is not properly defined, documented, or controlled. It is generally considered harmful.

  5. Grain boundary sliding - Wikipedia

    en.wikipedia.org/wiki/Grain_boundary_sliding

    Grain boundary sliding (GBS) is a material deformation mechanism where grains slide against each other. This occurs in polycrystalline material under external stress at high homologous temperature (above ~0.4 [1]) and low strain rate and is intertwined with creep.

  6. Creep-testing machine - Wikipedia

    en.wikipedia.org/wiki/Creep-testing_machine

    Primary Creep: the initial creep stage where the slope is rising rapidly at first in a short amount of time. After a certain amount of time has elapsed, the slope will begin to slowly decrease from its initial rise. Steady State Creep: the creep rate is constant so the line on the curve shows a straight line that is a steady rate.

  7. 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 ...

  8. Deformation (engineering) - Wikipedia

    en.wikipedia.org/wiki/Deformation_(engineering)

    For some materials, e.g. elastomers and polymers, subjected to large deformations, the engineering definition of strain is not applicable, e.g. typical engineering strains greater than 1%, [1] thus other more complex definitions of strain are required, such as stretch, logarithmic strain, Green strain, and Almansi strain.

  9. Diffusion creep - Wikipedia

    en.wikipedia.org/wiki/Diffusion_creep

    Diffusion creep is caused by the migration of crystalline defects through the lattice of a crystal such that when a crystal is subjected to a greater degree of compression in one direction relative to another, defects migrate to the crystal faces along the direction of compression, causing a net mass transfer that shortens the crystal in the ...