Abstract
It is already known that when a mechanical loading is applied to cement-based specimens weak electrical currents are generated. Their existence is attributed to the creation of cracks and the eventual evolution of the cracks’ network in the bulk of the specimen. This work introduces the simultaneous recording of electrical signal emissions at both the tension and the compression region of cement mortar beams of rectangular cross-section that were subjected to mechanical loading using the Three-Point-Bending technique. During the experiments the behavior of the electrical signal was studied during four sequential load stages: (1) Abrupt load increase up to the vicinity of 3 PB strength, (2) maintaining the high load level for relatively long time, (3) abrupt load decrease to a low load level (i.e. 50 % of the 3 PB strength approximately), (4) maintaining the low load level for relatively long time. The electrical signal analysis was conducted using non extensive statistical physics (NESP) and specifically the Tsallis entropy model studying the values of its q-parameter. The aim of this work was to study the electrical signal relaxation process that follows the change of the mechanical load and the law that describes this relaxation with respect to the mechanical status of the specimen using statistical physics analysis.
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Acknowledgments
This research has been co-financed by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: ARCHIMEDES III. Investing in knowledge society through the European Social Fund.
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Stergiopoulos, C., Stavrakas, I., Triantis, D., Hloupis, G., Vallianatos, F. (2015). The Use of PSC Technique to Estimate the Damage Extension During Three Point Bending Test. In: Öchsner, A., Altenbach, H. (eds) Mechanical and Materials Engineering of Modern Structure and Component Design. Advanced Structured Materials, vol 70. Springer, Cham. https://doi.org/10.1007/978-3-319-19443-1_29
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DOI: https://doi.org/10.1007/978-3-319-19443-1_29
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