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    STP1571

    In-Plane Biaxial Fatigue Testing Machine Powered by Linear Iron-Core Motors

    Published: 2014


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    Abstract

    This work presents a new in-plane biaxial fatigue-testing machine built with four iron-core linear motors, which are presently the most powerful on the market for industrial applications. The testing system includes a non-conventional guiding device, allowing an adjustable and precise linear movement without contact, with many advantages for fatigue testing and, in particular, for biaxial in-plane testing. These are assembled in a strong horizontal frame, allowing several configurations for uniaxial and biaxial testing. The control can be made in open loop (by controlling directly the current on the motor, which is almost proportional to the force) or closed loop through the ±5-kN dynamic force transducers or by the magnetic encoders with 1 μm resolution. Details of the controller are also presented, which was specifically designed to keep the specimen stable and to ensure biaxial symmetry during the fatigue test. The dynamic force capacity under several biaxial force conditions is presented by diagrams, showing that this machine is appropriated to test efficiently small samples of engineering materials.

    Keywords:

    in-plane biaxial fatigue, iron-core linear motors, fatigue-testing machine


    Author Information:

    Freitas, M.
    ICEMS, Instituto Superior Técnico, UTL, Lisboa,

    Reis, L.
    ICEMS, Instituto Superior Técnico, UTL, Lisboa,

    Li, B.
    ICEMS, Instituto Superior Técnico, UTL, Lisboa,

    Guelho, I.
    ICEMS, Instituto Superior Técnico, UTL, Lisboa,

    Antunes, V.
    ESTSetúbal, Instituto Politécnico de Setúbal, Campus do IPS, Estefanilha, Setúbal,

    CIEEE, Instituto Superior Técnico, UTL, Lisboa,

    Maia, J.
    ESTSetúbal, Instituto Politécnico de Setúbal, Campus do IPS, Estefanilha, Setúbal,

    CIEEE, Instituto Superior Técnico, UTL, Lisboa,

    Cláudio, R. A.
    ICEMS, Instituto Superior Técnico, UTL, Lisboa,

    ESTSetúbal, Instituto Politécnico de Setúbal, Campus do IPS, Estefanilha, Setúbal,


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP157120130078