PSI - Issue 59

Andrii Babii et al. / Procedia Structural Integrity 59 (2024) 609–616 Andrii Babii et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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1. Introduction Chemical plant protection machines are widely used in modern agricultural production. This is due to the frequency of chemical plant treatments. The main machines that implement this technological process are boom sprayers. Approximately 80% of all areas are treated by such machines. Along with the positive technological effect of boom sprayers, their structures, particularly tanks and booms, have a number of problems, the solutions of which are presented in many papers (Andreikiv et al. (2022), Hevko (2021)). The most typical failures of sprayer booms and tanks produced by both domestic and foreign manufacturers are shown in Fig. 1 a, b.

Fig. 1. (a) typical failures of boom frames and (b) tanks of wide-coverage sprayers.

There are many approaches and calculation methods for predicting the service life of such steel structures (Andreikiv et al. (2020), Ripetskyy et al. (2021), Rybak et al. (2019), Yasniy et al. (2016), Yasniy et al. (2017)), and the ways of reducing dynamic loads, which increase the efficiency of the booms have been developed. As it was mentioned above, in addition to the failures of the boom frames of wide-coverage sprayers, the same failures are observed in the tanks of chemical plant protection machines, Fig. 1 b. Regardless of whether the tank of chemical protection machine is made of metal or polymer composite, such structures are subjected to failure. The occurrence of cracks in such structural elements is caused by many reasons, the most important one among them is the method of fixing the tank to the machine frame. The influence of supports and bandage-type tightening devices is essential for the occurrence of stress-strain state of the shell itself. 2. Problem statement and method of solution The outlined problem requires further investigations, especially in terms of developing the methods for calculating the service life of shell structures of chemical plant protection machines. However, the first step is to determine the stress-strain state of the shell, the impact of characteristic loads, etc. Therefore, we will divide these important investigations into conditional stages and in this paper we will focus on the construction of the theoretical model of sprayer tank loading and we will determine the connection with its stressed state. For such investigation, let us take the tank of small-sized sprayer, which functionally operates as a reservoir for the working fluid and as concentrated mass in the system of dynamic boom oscillation damper. Moreover, for small sized sprayers, the problem of boom stabilization is not sufficiently developed and requires scientific substantiation as well. 3. Construction of the loading model Let us consider the sprayer tank subjected to complex loading. The walls of the tank are subjected to the following forces: the weight of the working fluid; internal pressure injected into the tank to displace the fluid and supply the pressure line and operating spray devices, respectively; contact pressure from tightening the tank with bandages; pressure from the supports action. In addition, the tank can be subjected to additional loadings during oscillations, since it tank acts as dynamic damper for boom vibrations (Diveyev et al. (2012)). The carried out investigation deals with the development of the problem of the influence of structural fastening elements in the general loading scheme (Babii et al. (2022), Lyashuk et al. (2023), Pidgurskyi et al. (2018)) of the