the article presents a methodology for assessing the service life of torsion shafts of individual suspension systems of transport vehicles, based on modern principles of the theory of movement of transport vehicles and fracture mechanics. Design/methodology/approach: the technique is based on the developed mathematical model for the propagation of an edge crack inclined relative to the longitudinal axis of the shaft located on the cylindrical part of the torsion shaft under the conditions of a simplified plane stress state. Originality/value: a distinctive feature of the model is the use of original dependencies to determine the values of the Kcalibration function when determining stress intensity factors, as well as taking into account the influence of force and kinematic factors determined by misalignment, collapse of the torsion shaft bearings and deformation of large axes of the balancers on the stress state in the vicinity of the front of the fatigue crack.
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