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Creep is the flow plastic deformation of metals under a constant stress. The need to consider this arises when materials are under load at high temperatures.
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The specimens are tested in a battery or rigs at the same temperature but under different stresses. From the information, obtained graphs are drawn which indicate the performance of the material under working conditions.
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The creep value may be given as:

  1. percentage elongation for given stress at a given temperature in a given time,

  2. The stress required to cause a maximum permissible creep strain of 0.001 in 100,000 hrs.

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Any one of a number of methods of measuring creep, for example, by subjecting a material to a constant stress or deforming it at a constant rate.

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