lec15 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF...

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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING CAMBRIDGE, MA 02139 2.002 MECHANICS AND MATERIALS II Spring, 2004 Creep and Creep Fracture: Part III Creep Fracture c L. Anand Mechanisms of Creep Fracture Figure 1: Creep strain-time curve for constant stress at constant temperature Figure 2: The upper row refers to low temperatures ( ≤ . 3 T M ) where plastic flow does not depend strongly on temperature or time; the lower row refers to the temperature range ( ≥ . 3 T M )in which materials creep. Image removed due to copyright considerations. Figure 3: Schematic of creep fracture mechanisms Figure 4: Schematic of uniaxial stress versus time to fracture data Figure 5: Map of isothermal fracture data for Nimonic-80A Image removed due to copyright considerations. Figure 6: Map of isothermal fracture data for 304 stainless steel Image removed due to copyright considerations. Figure 7: Map of isothermal fracture data for 316 stainless steel Image removed due to copyright considerations. Figure 8: Micrographs of copper plates illustrating the continuous distribution of creep damage in plates containing notches and subjected to far-field uniaxial tension. Note that it is predominantly the grain boundaries perpendicular to the applied stress that are preferentially damaged....
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This note was uploaded on 02/23/2012 for the course MECHANICAL 2.002 taught by Professor Davidparks during the Spring '04 term at MIT.

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lec15 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF...

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