Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.248972

Keywords:

pressure head fire hose, material strength, experimental studies, experimental design, damage variation limits

Abstract

Experimental studies are presented and the dependence of the change in the strength of the material of a pressure head fire hose of type T with an inner diameter of 77 mm in the longitudinal direction is established, taking into account single damages. The work describes the plan of the experiment and carried out a number of field experiments to determine the effect of the length ld and the depth K damage on the strength F of the hose material, that is, obtaining the dependence F=f (ld, K). A mathematical method of experiment planning was used and a plan was drawn up for a complete multivariate experiment of type 2k with an acceptable model accuracy of 5 %. The limits of variation of the factors are set taking into account a priori information, experimental capabilities and on the basis of the results of preliminary search experiments. The dependence in the coded and natural values of the factors is obtained. The reliability of the relationship was checked using the Fisher test, the calculated value of which was 5.98, which confirms the adequacy of the described process with a probability of 95 %.

Analyzing experimental studies of the dependence of the change in the strength of the hose material on the length and depth of damage, it can be said that the change in the strength of the hose almost linearly depends on the specified damage parameters. It is found that with increasing damage, the strength of the hose material significantly decreases. When varying the length factor and the greatest depth of damage, K=0.4 mm, the strength of the hose material decreases from 11.67 kN to 8.77 kN, and in percentage terms by 25 %.

The results obtained can be used in practical units of emergency rescue teams, when diagnosing hidden damage in pressure head fire hoses in order to prevent their failure in case of fires

Author Biographies

Sergii Nazarenko, National University of Civil Defence of Ukraine

PhD, Associate Professor

Department of Engineering and Rescue Machinery

Galina Kushnareva, Military Academy

PhD, Associate Professor

Department of Troops (Forces) Support

Natalia Maslich, Military Academy

PhD, Associate Professor

Department of Engineering Mechanics

Ludmila Knaub, Military Academy

Doctor of Technical Sciences, Professor

Department of Engineering Mechanics

Nataliia Naumenko, State Higher Education Institution «Ukrainian State University of Chemical Technology»

PhD, Associate Professor

Department of Information Systems

Roman Kovalenko, National University of Civil Defence of Ukraine

PhD

Department of Engineering and Rescue Machinery

Valery Konkin, National Technical University “Kharkiv Polytechnic Institute”

PhD, Associate Professor

Department of Continuum Mechanics and Strength of Materials

Elena Sukharkova, National University of Civil Defence of Ukraine

Department of Engineering and Rescue Machinery

Oleksandr Kolienov, National University of Civil Defence of Ukraine

Department of Management and Organization in the Field of Civil Defence

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Published

2021-12-29

How to Cite

Nazarenko, S., Kushnareva, G., Maslich, N., Knaub, L., Naumenko, N., Kovalenko, R., Konkin, V., Sukharkova, E., & Kolienov, O. (2021). Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages. Eastern-European Journal of Enterprise Technologies, 6(1 (114), 21–27. https://doi.org/10.15587/1729-4061.2021.248972

Issue

Section

Engineering technological systems