Abstract
Components of transport trucks are subjected to dynamic cyclic loads. The magnitude of these loads depends on road conditions and cargo mass. Cyclic loads can cause fatigue failure at stress levels significantly below the yield strength of the material. When calculating fatigue, it is necessary to determine the actual loads acting on the structure under working conditions. In this study, stanchion displacements of overloaded timber trucks were measured under both static and dynamic loads. For the specified mass of timber, a history of dynamic loads acting on the stanchion was obtained. Then, based on the finite element analysis, stress concentration points were determined within the base material and welded joints of the stanchion. The history of maximum stresses at concentration points was determined. Stress ranges and mean stresses for the load history were calculated using the rainflow fatigue cycle counting method. Repeats to failure were determined on the basis of the Palmgren–Miner cumulative damage rule and the modified Goodman correction for the points with the highest stress level. Experimental investigation of the actual load history of the stanchion of significantly overloaded timber truck allowed to determine the mileage to potential failure.
Highlights
Timber trucks are commonly used to transport logs on both forest and public roads.Transportation is the most expensive part of the timber production process
Based on the finite element analysis, stress concentration points were determined within the base material and welded joints of the stanchion
The tested pressure was determined by experimental analysis, while the finite element method was used for fatigue life calculations and optimization
Summary
Timber trucks are commonly used to transport logs on both forest and public roads. Transportation is the most expensive part of the timber production process. Romanowicz and Szybiński delivered analytical formulas in [8] for determining stresses in the contact area and proposed a methodology for fatigue life assessment of rolling bearings by applying the multiaxial high-cycle fatigue hypothesis. A cumulative damage theory and a structural stress method were applied to determine the fatigue life of welded components. Finite element stress analysis and the fatigue damage prediction based on the rainflow cycle counting method were involved. The tested pressure was determined by experimental analysis, while the finite element method was used for fatigue life calculations and optimization. The thermomechanical model and high-cycle regime were considered Both the fatigue strength reduction method and the hot-spot method were used to assess the fatigue life of welded joints. By applying a modified Goodman mean stress correction and the Palmgren–Miner cumulative damage rule, the life to failure of the stanchion was determined
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