Energy Parameter Control System of Strength Machine for Material Tests under Cyclic Bending and Torsion

Abstract:

The paper presents strength machine control system for characterization of fatigue properties of materials based on a new, recently defined, energy fatigue damage parameter. It is used in new procedure for precise determination of the fatigue characteristics of materials with the controlled strain energy density parameter. The new parameter distinguishes positive and negative values strain energy density histories during variable loading. In case of modern, cyclically unstable materials the new closed-loop control system of strength machine allows to univocally establish the relevant stress-strain based fatigue characteristic under bending and torsion. This control system has been implemented with the use of National Instruments LabVIEW software. The mechatronic stand based on fatigue machine for material testing under bending moment and torsion moment has been described and preliminarily material tests have been done.

• Periodical: Solid State Phenomena (Volume 198)
• Pages: 489-494
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.198.489
• Online since: March 2013
• Authors: Leszek Kasprzyczak, Ewald Macha, Zbigniew Marciniak
• Keywords: Bending, Cyclic Loading, Fatigue of Materials, Strain Energy Density, Torsion

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