Determination of the Constitutive Relation Parameters of a Metallic Material by Measurement of Temperature Increment in Compressive Dynamic Tests Articles uri icon

authors

  • GUZMAN LOPEZ, ROLANDO ENRIQUE
  • MELENDEZ SANCHEZ, JUAN
  • ZAHR VIÑUELA, JORGE ALONSO
  • PEREZ CASTELLANOS, JOSE LUIS

publication date

  • March 2010

start page

  • 389

end page

  • 397

issue

  • 3

volume

  • 50

International Standard Serial Number (ISSN)

  • 0014-4851

Electronic International Standard Serial Number (EISSN)

  • 1741-2765

abstract

  • The mechanical behaviour of a material can be established by an analytic expression called the constitutive relation that shows stress as a function of plastic strain, strain rate,
    temperature, and possibly other thermo-mechanical variables. The
    constitutive relation usually includes such parameters as
    coefficients or exponents that must be determined. At a high strain
    rate, the heat generated during the deformation process is
    directly related to the plastic deformation energy of the material.
    This energy can be calculated from the plastic work,
    resulting in an expression that includes the constitutive relation
    parameters
    as variables. The heat generated can also be estimated by
    measuring the temperature surface of the specimen during compressive
    tests using the technique of infrared thermography. The
    objective of this paper is to present a procedure for determining
    the constitutive relation parameters by measuring the
    temperature increase associated with plastic strain in compressive
    Hopkinson
    tests. The procedure was applied to estimate the parameters
    of the Johnson&-Cook constitutive relation of an aluminium alloy
    (Al6082).