9-Elevated Temp & Fracture

Temperature for pb melting point 450oc 430oc low

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Unformatted text preview: 430oC = "high" temperature for Pb; melting point = 450oC 430oC = "low" temperature for Fe; melting point = 1535oC Chemical reaction rates go up as temperature goes up. Environmental factors can become controlling. CREEP When a material is under a constant load or stress, it may undergo progressive plastic deformation over a period of time at a constant temperature. Time dependent strain CREEP TEST CONDITIONS Above 1/2 absolute melting point Constant load Plot change of length of specimen or strain vs. time Creep Test Result STAGES OF CREEP Primary Creep Strain rate pr...
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