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Structural Engineering and Mechanics
  Volume 20, Number 5, July30 2005, pages 495-504

Prediction of the dynamic flow stress
Marcilio Alves

    This article explores a constitutive equation that is able to correlate stress, strain and strain rate. In order to show the advantages of the constitutive equation here proposed and how its material parameters are obtained, data extracted from the literature, for materials as different as polymers and metallic alloys, are used. Finite element simulation of the impact behaviour of a beam is presented to highlight the care one needs to exercise when using the more traditional Cowper-Symonds equation. The present constitutive equation has shown to be accurate for a wide range of strains, stresses and strain rates.
Key Words
    dynamic tensile test; constitutive equation; Cowper-Symonds equation.
Department of Mechatronics and Mechanical Systems Engineering, University of Sao Paulo, Av. Prof. Mello Moraes, 2231, 05508-900, Sao Paulo, SP, Brazil

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