Development of a registration and parameter control device for cyclic tests of prefabricated structures

Abstract

The movement of rolling stock is based on its safety and reliability, which is directly related to the fatigue strength of the mechanical component which is a prefabricated structure whose parts work under conditions of impact on each other. Under the circumstances, the analysis of the fatigue strength of a part during full-scale tests under operation does not provide a complete assessment of its performance, it is also associated with significant cost and time losses. To compensate for these problems, it is proposed to perform full-scale tests of samples of parts in laboratory conditions. However, for the implementation of full-fledged laboratory tests, it becomes necessary to both develop a stand with control system, and a system for monitoring and registering the experimental results obtained. Such tests are carried out on specialized stands that allow to create the necessary stress-strain state. In the current work, a system for monitoring and recording parameters obtained during the operation of the stand performing the prefabricated structures cyclic tests has been developed. Its advantage is a universality as the most important requirement allowing the system to be used in stands for the fatigue strength tests. The control and regulation of parameters from the cyclic load is implemented on a microcontroller, which receives information from the sensor of the stand position and the current loading force of the prefabricated structure, with further recording of cycles and the maximum loading force for each cycle. It is also possible to continue the fatigue test in case of an abnormal shutdown of the stand or its required shutdown associated with a given criterion for reducing the force of impact on the sample in the microcontroller program.