631.373:519.6

trailer, frame, finite element method, stress-strain state, stress, deformation, displacement, safety factor.

Analysis of load-bearing structures of vehicles is carried out. The peculiarities of the operation of vehicles and their bearing systems are considered. It is noted that the loads acting on the structure are time-varying; their amplitude and frequency characteristics depend on the real load, the speed of the vehicle, the condition of the road surface and other factors. This can cause a high level of stress in the areas of structural and technological concentrators and result in the occurrence of fatigue cracks and frames destruction in these areas. The researching methods of operational loads and the stress-strain state of frame structures under static and dynamic loads are analyzed. It is noted that the finite element method is the most universal for the implementation of static, modal, harmonic and other types of analyzes of frame structures. The finite element method is used to investigate the stress-strain state of bearing structure of the 2PTS-2 trailer under different static load options. The full-scale CAD model of the trailer and its finite-element model are developed using specialized software SolidWorks. Calculations of the stress-strain state of the trailer frame are carried out for typical types of loads: straight-line movement, turning and lifting of the vehicles body with load. The analysis of the safety factors by stresses is carried out in order to take into account the uncertainties of the frame structure model and the uncertainties of the operational load. It is established that when considering the investigated options for loading of the frame structure, the most dangerous are those related to the unloading of the cargo, which requires further research into the specified processes.

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1. Algin V. B. Raschet mobilnoy tekhniki: kinematika. dinamika. resurs. Minsk: Belaruskaya navuka, 2014. 271 р. [In Russian].
2. Caban J., Nieoczym A., Gardyński L. Strength analysis of a container semi-truck frame. Engineering Failure Analysis. Vol. 127. 2021. 12 p.
3. Pіdgurskyi M., Ripetskyi Ye., Pidgurskyi I. Research and simulation of load modes in the evaluation of mobile machines resource. AIP Conference Proceedings. 2029. 020064. 2018. 7 p.
4. Sen Zheng, Kai Cheng, Jixin Wang, Qingde Liao, Xiaoguang Liu, Weiwei Liu Failure analysis of frame crack on a wide-body mining dump truck. Vol. 48. 2015. P. 153–165.
5. Thangarasu V. S., Dhandapani N. V., Sureshkannan G. A study on fatigue failure analysis of an off-highway vehicle chassis. International Journal of Applied Engineering Research. Vol. 10. No. 71. 2015.
   P. 392–400.
6. Garud R. Y., Tamboli S. C., Pandey A. Structural Analysis of Automotive Chassis, Design Modification, and Optimization. International Journal of Applied Engineering Research. Vol. 13. No. 11. 2018.
   P. 9887–9892.
7. Madhu Ps., Venugopal T. R. Static Analysis, Design Modification and Modal Analysis of Structural Chassis Frame. Int. Journal of Engineering Research and Applications.Vol. 4. Issue 5. May 2014.
   P. 6–10.
8. Angga Kengkongan Ary, Yuwana Sanjaya, Aditya Rio Prabowo, Fitrian Imaduddin, Nur Azmah Binti Nordin, Iwan Istanto and Joung Hyung Cho. Numerical estimation of the torsional stiffness characteristics on urban Shell Eco-Marathon (SEM) vehicle design. Curved and Layered Structures. Vol. 8. No. 1. 2021. P. 167–180.
9. Ruslan Khakimzyanov, Anvar Togaev, and Aziz Rashidov The stress-strain state of the universal chassis of the tractor trailer in T-Flex. E3S Web of Conferences 264, 02008. 2021. 8 p.
10. Rybak T.I . Poshukove konstruiuvannia na bazi optymizatsii resursu mobilnykh silskohospodarskykh mashyn. Ternopil: Zbruch, 2003. 332 p. [In Ukrainian].
11. Eremenko S. Yu. Metody konechnykh elementov v mekhanike deformiruyemykh tel. Kharkov: Osnova. 1991. 272 p. [In Russian].
12. Matt Lombard Mastering SolidWorks. John Wiley & Sons, Inc., Indianapolis, Indiana, 2019. 1210 p.