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This work was partly prepared as part of the Kazimierz Drozd scientific internship at the Institute of Mechanical Science of Vilnius Gediminas Technical University which took place from 26 July to 6 August 2021; and the Mariusz Walczak scientific internship at the Institute of Mechanical Science of Vilnius Gediminas Technical University which took place from 11 July to 8 August 2022.
Road transport plays an important role in the transport of goods and people and is
important for the national economy. Damage usually excludes the means of transport from operation,
which causes disruption of supply chains. One such damage is the failure of the suspension system of
the vehicle or trailer, which usually occurs when the vehicle is heavily loaded. Such a defective system
has been analyzed in this publication. Mathematical apparatus and finite element method (FEM)
numerical simulations were used. A dangerous axle cross-section in terms of load was indicated and
the maximum stresses in this area were calculated for two types of roads. On highways, the stress at
the critical point was 199 MPa, and on uneven roads it increased to 304 MPa, which is comparable to
the yield point. It was found that the second form of vibration may cause stresses in the damage area,
but the excitation frequency would have to be quite high. The probability of such a load and failure
event occurring is low under operating conditions.
