Abstract
Calculating and experimental methods were used to study the stress-strain state of the connecting rod of the oppositional compressor operating in the chemical industry. Computational and experimental methods for assessing the stress-strain state of the compressor connecting rod head were previously tested on models, since the connecting rods are large and conducting research on a running compressor is extremely difficult. Similarity criteria are defined that allow the methods and results of studies obtained on models to be applied to the assessment of the stress-strain state of connecting rods. The dependence of the contact angle between the connecting rod and the connecting rod finger on the load, the gap in the coupling and the geometric characteristics of the head was obtained. For the connecting rod head, a numerical experiment was used to calculate the stress state under loads and gaps in the connecting rod – pin, corresponding to the operational ones. Analysis of the stress distribution obtained by the calculation allowed us to estimate the dependence of stresses on the magnitude of the applied load, the magnitude of gaps in the interface and the change in the angular coordinates of the sections with the maximum stress values. Taking into account the obtained results, a method has been developed and a study of the stress distribution of the compressor head in operation has been carried out. For the maximum loaded sections of the connecting rod head, the fatigue resistance characteristics and the characteristics of regular variable loading in operation at rated load are determined. Based on the results obtained, the probability of failure depending on the magnitude of the loads and the size of the gaps was evaluated.
Published Version
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