Determine Parameters for Double-K Model at Three-Point Bending by Application of Acoustic Emission Method

Abstract:

As concrete is one of the most popular building materials, it is important to know its basic properties and behaviour especially at loading. When cracks occur in concrete, released fracture energy will be proportionally transformed into the energy contained in acoustic emission. According to this physical phenomenon, acoustic emission technique provides an effective monitoring method for fracture process of concrete through generated acoustic emission. However, such monitoring is limited in qualitative evaluation of fracture process in most occasions. Quantitative interpretation of fracture process is difficult to accomplish by simply acquiring the amount of acoustic emission generated or by conducting parameter-based acoustic emission analysis. This paper investigates the use of the double-K fracture model and acoustic emission for prediction of load at the beginning of stable crack propagation in three-point bending tests of concrete specimens. Double-K model combines the concept of cohesive forces acting on the effective crack increment with a criterion based on the stress intensity factor.

• Periodical: Applied Mechanics and Materials (Volume 486)
• Pages: 151-156
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.486.151
• Online since: December 2013
• Authors: Lubos Pazdera*, Libor Topolář, Hana Šimonová, Pavel Fojtu, Jaroslav Smutny, Ivana Havlíková, Zbyněk Keršner, Veronika Rodriguezova
• Keywords: Acoustic Emission (AE), Concrete, Crack, Double-K Fracture Model, Energy, Fracture, Micro-Crack, Three-Point Bending

References

[1] D. Fukuda, K. Moriya, K. Kaneko, K. Sasaki, R. Sakamoto, K. Hidani, Numerical simulation of the fracture process in concrete resulting from deflagration phenomena, International Journal of Fracture, 180(2), 163-175, (2013).

DOI: 10.1007/s10704-013-9809-4

[2] M. Korenska, L. Pazdera, M. Manychová, Acoustic Emission Method as a Tool of Partial Discharges Indication, International Journal of Materials & Product Technology, 42(3/4), 209 - 218 (2011).

DOI: 10.1504/ijmpt.2011.045468

[3] L. Topolar, L. Pazdera, V. Bilek, L. Dedeckova, Acoustic Emission Method Applied on Four Point Loading of Concrete Structures with and without Small Wires, proc. of the 50th Annual Conference on Experimental Stress Analysis, Praha, 477 - 484. (2012).

[4] P. Mazal, L. Pazdera, Advanced Acoustic Emission Signal treatment in the Area of Mechanical Loading, The 8th Int. Conf. of the Slovenian Soc. for NDT Application of Contemporary NDT in Engineering, Portoroz, SSNDT, Slovenia, 283 - 292. (2005).

[5] S. Kumar and S. Barai, Concrete Fracture Models and Applications, Springer, Berlin (2011).

[6] P. Mazal, L. Pazdera, J. Dvořáček, Application of acoustic emission method in contact damage identification. International Journal of Materials & Product Technology, 41(1), 140 - 152 (2011).

DOI: 10.1504/ijmpt.2011.040292

[7] H. Simonova, Z. Kersner, S. Seitl, Correction of Fatigue Parameter Values of Concrete using Approximation of Mechanical-Fracture Parameter Values in Time, proc. of the 17th International Conference on Engineering Mechanics, Svratka, Czech Rep., 595-598 (2011).

[8] W. Dong, W. Zhimin, XM Zhou, Calculating Crack Extension Resistance of Concrete based on a new Crack Propagation Criterion, Construction and Building Materials, vol. 38, 879-889 (2013).

DOI: 10.1016/j.conbuildmat.2012.09.037