STP811

    Quantitative Measurements in the Plastic Zone Caused by a Single Overload in Air and Vacuum

    Published: Jan 1983


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    Abstract

    Plastic deformations near the crack tip following overload tests in air and vacuum on 2024-T351 aluminum alloy were measured by interferential-contrast, interferometry, and microhardness methods. The evolution of the plastic zone sizes in the overload-affected zone is described. Quantitative analysis of the results obtained show that plastic zone sizes are higher in vacuum and the distribution of plastic strains are different than in air. Differences in plastic zones between plane stress and plane strain conditions are also shown. These results, complemented with macrofractographic and microfractographic measurements and the calculation of the J-integrals, suggest an explanation for the differences in material behavior in air and vacuum.

    Keywords:

    fatigue delay, environmental effect, plastic zones, plastic strain distribution


    Author Information:

    Ranganathan, N
    Laboratoire de Mécanique et de Physique des Matériaux, ENSMA, Poitiers,

    Petit, J
    Laboratoire de Mécanique et de Physique des Matériaux, ENSMA, Poitiers,


    Paper ID: STP30570S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP30570S


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