... stress axis Temperature is a major factor on creep the higher the temperature i.e. the closer to the melting point the faster creep takes place. It is diffusion within the material that causes dislocations and the movement of atoms, causing the length of a specimen to increase in gauge length while under a constant applied load. In this lab lead will be used as not many other materials have Tm/3 (melting point temperature) at room temperature, which will remove the need to heat the specimen to the necessary temperature. The tests will consist of taking lead specimens and applying a constant load by means of hanging weights. The total weight applied to each specimen will be less than the failure strength of the material. The specimen will then gradually increase in length until its cross sectional area will not be sufficient to support the applied load and fracture will occur. Theory There are three ...

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