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Structural Engineering and Mechanics Volume 22, Number 1, January10 2006 , pages 17-32 DOI: https://doi.org/10.12989/sem.2006.22.1.017 |
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The uniaxial strain test - a simple method for the characterization of porous materials |
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T. Fiedler, A. Ochsner and J. Gracio
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| Abstract | ||
| The application of cellular materials in load-carrying and security-relevant structures requires the exact prediction of their mechanical behavior, which necessitates the development of robust simulation models and techniques based on appropriate experimental procedures. The determination of the yield surface requires experiments under multi-axial stress states because the yield behavior is sensitive to the hydrostatic stress and simple uniaxial tests aim only to determine one single point of the yield surface. Therefore, an experimental technique based on a uniaxial strain test for the description of the influence of the hydrostatic stress on the yield condition in the elastic-plastic transition zone at small strains is proposed and numerically investigated. Furthermore, this experimental technique enables the determination of a second elastic constant, e.g., Poisson\'s ratio. | ||
| Key Words | ||
| multi-axial testing; cellular solids; plasticity; yield surface; nonlinear behavior. | ||
| Address | ||
| T. Fiedler; Centre for Mechanical Technology and Automation, University of Aveiro, Aveiro, Portugal A. Ochsner and J. Gracio; Centre for Mechanical Technology and Automation, University of Aveiro, Aveiro, Portugal Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal | ||