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Nonlinear Behavior of Metallic Material Under Constant Acceleration Loading

[+] Author Affiliations
Monir Takla, Reza N. Jazar

RMIT University, Melbourne, VIC, Australia

Paper No. IMECE2010-37612, pp. 287-291; 5 pages
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 8: Dynamic Systems and Control, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4445-8
  • Copyright © 2010 by ASME


There is frequent confusion in literature and in published data of material properties between the strain rate effect and the inertia effect on the behavior of metallic materials. While the measured changes of material behavior due to dynamic loading are frequently referred to as strain rate effects, little emphasis has been given to separating the effects of material inertia. In this work, inertia effects have been investigated during elastic deformations using transient dynamic finite element simulations. The work presents a case study in which a metallic bar is dynamically loaded by constant acceleration in simple tension. The material is assumed to be simple linear elastic. The material behavior is assumed to be time independent, strain rate effect was not considered in the simulations. Controlled axial displacement loading is applied at constant acceleration. When loading the material in the elastic range at high accelerations, the deformation becomes more concentrated towards the point of load application and a larger load is required to achieve a pre-defined displacement at this point, thus resulting in an apparent elasticity modulus higher than that measured at quasi-static conditions. Moreover, the material apparent response becomes non-linear. Keeping in mind that time independent properties have been adopted in the simulation and no strain rate effects have been considered, the resulting changes can be referred to pure inertia effects. In experimental testing, these changes would have been referred to strain-rate effects.

Copyright © 2010 by ASME



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