Application of acoustic emission method for the evaluation of the micromechanics of destruction of fiberglass materials under static load
Abstract
The paper presents the results of experimental studies using the acoustic emission method of samples made of fiberglass, the design feature of which is the presence of both base fibers and weft fibers. The test data are presented in relative units and the concept of staged damage accumulation is used, which allows one to recognize subtle phenomena of the nature of the destruction of fiberglass. Tests of the samples with a transverse arrangement of fibers with respect to the applied load showed that the fracture process both in the strain parameters and in the parameters of the total acoustic emission has two stages of damage accumulation: the stage of proportional change of these parameters from stress and the stage of intensive increment of these parameters. In this case, the parameter of the total acoustic emission shows that this process of destruction begins earlier by 5–6% than the strain parameter shows. The proposed methodology and equipment allows us to identify the nature of fracture and assess the tensile strength of such a “staged” composition, and also to solve the problem of what affected the structural unity violations, which may be due to the presence of a set of cracks formed during manufacturing or under the influence of stresses and the external environment during the process of loading.
Keyword : acoustic emission, safety of constructions, deformation, composite materials, composite structures, composite fibers and matrix, polymers, stiffness, specific viscosity, heat resistance
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
Koruba, Z., & Nocoń, Ł. (2016). Numerical analysis of dynamics of an automatically tracked anti-tank guided missile using polynomial functions. Journal of Theoretical and Applied Mechanics, 54(1), 13–25. https://doi.org/10.15632/jtam-pl.54.1.13
Kurzydłowski, K. J., Boczkowska, A., Shmidt, J., Konopka, K., & Spychalski, W. (2005). Monitoring of failures in the composites by non-destructive methods (in Polish). Polimery, 50(4), 255–261. https://doi.org/10.14314/polimery.2005.255
Mortensen, A. (2007). Concise encycloped of composite materials (2nd ed.). Elsevier.
Myers, T. J., Kytömaa, H. K., & Smit, T. R. (2007). Environmental stress-corrosion cracking of fiberglass: lessons learned from failures in the chemical industry. Journal of Hazardous Materials, 142(3), 695–704. https://doi.org/10.1016/j.jhazmat.2006.06.132
Nowacki, J., & Sieczkiewicz, N. (2018). Advances in NDT assessment of the quality of polymer composites in production conditions (in Polish). Nondestructive Testing and Diagnostics, 1, 11–17.
Nowakowski, L., & Wijas, M. (2016). The evaluation of the process of surface regeneration after laser cladding and face milling. In I. Zolotarev & V. Radolf (Eds.), Proceedings of 22th International Conference Engineering Mechanics 2016 (pp. 430–433). Institute of Thermomechanics, The Czech Academy of Science, Prague.
Paramonov, Yu., & Andersons, J. (2007). A family of weakest link models for fibre strength distribution. Composites part A: Applied Science and Manufacturing, 38(4), 1227–1233. https://doi.org/10.1016/j.compositesa.2006.06.004
Parratt, N. J. (1960). Defects in glass fibers and their effects on the strength of plastic mouldings. Rubber and Plastics Age, March 1960.
Prostaks, J., & Urbaha, M. (2019). Evaluating accuracy of fault localization when monitoring condition of large structures by acoustic method. In Contents of Proceedings of 18th International Scientific Conference Engineering for Rural Development, 18, 1280–1286. https://doi.org/10.22616/ERDev2019.18.N143
Reifsnider, K. L., & Stinchcomb, W. W. (2005). A critical-element model of the residual strength and life of fatigue-loaded composite coupons. In H. H. Thomas, Composite Materials: Fatigue and Fracture (pp. 298–313). ASTM International. https://doi.org/10.1520/STP19992S
Roy, R., Kweon, J., & Choi, J. H. (2014). Meso-scale finite element modeling of NomexTM honeycomb cores. Advanced Composite Materials, 23(1), 17–29. https://doi.org/10.1080/09243046.2013.862382
Shanley, F. (1962). Historical note on the 1.5 factor of safety for aircraft structures. Journal of the Aerospace Sciences, 29(2), 243–244. https://doi.org/10.2514/8.9385
Szafran, K., Krzymień, W., & Cieślak, S. (2018). Acoustic characteristics of the cabin of the research platform on the Airbag IL-PRC- 600M. Transaction on Aerospace Research, 2(251), 16–29. https://doi.org/10.2478/tar-2018-0012
Szafran, K., & Delas, N. (2018). Accumulation of fatigue microdefects – entropy interpretation. Fatigue of Aircraft Structures. 2018(10), 104–116. https://doi.org/10.2478/fas-2018-0010
Świt, G., & Adamczak, A. (2015). Stress corrosion of epoxy-glass composites monitored using acoustic emission (in Polish). TTS Technika Transport Szynowego, 22(12), 1531–1534.
Urbahs, A., Banovs, M., Harbuz, Y., Turko, V., Feščuks, J., & Khodos, N. (2010, 5–9 July). Estimation of mechanical properties of the anisotropic reinforced plastics with application of the method of acoustic emission [Conference presentation abstracts]. The 2nd International Specialized Symposium “Space & Global Security of Humanity” (p. 93). Latvia, Rīga.
Urbahs, A., Banovs, M., Turko, V., & Feshchuk, Y. (2012, 26–27 April). New approach to use the acoustic emission monitoring for the defects detection of composit-material’s design elements. In Water Transport and Infrastructure: 1. International Conference (pp. 45–50). Latvia, Riga.
Urbahs, A., Banovs, M., Turko, V., Feshchuk, Y., & Khodos, N. (2011, 11–15 July). Investigation of micromechanics of plasto-elastic behaviour of anisotropic composite materials under static loading by the acoustic emission method. In Advances and Trends in Engineering Materials and Their Applications: Conference Proceedings. Latvia, Riga.