Strength test method and test equipment

Abstract

The invention relates to a strength test method and test equipment, including the following steps: adding load to the part to be test, keeping the load for the set time, then removing the load; testing the displacements of test point during the process from initially adding the load to removing the load; drawing the displacement curve according to the test results and determine whether the part isqualified with the difference value between the displacements of the first test point at the load adding initial stage and the second test point at the stage of removal load for restoring. The strength test method and test equipment provide a new approach for strength test and assessment of moving parts such as seat, which either avoid the defect that is difficult to control the definition of deformation dimension in traditional deformation measurement, or avoid the limitation of the paste parts selection when pasting stress film for test, the strength test method has the characteristics of simple operation, easy implementation, accurate and reliable test results, low cost.

Description

technical field [0001] The invention relates to a testing device, in particular to a strength testing method and testing device. Background technique [0002] As the key passenger equipment of the EMU, the seat has functions such as 180° rotation of the whole seat, adjustment of the backrest angle, and upturning of the armrest in order to improve the passenger comfort. The strength of the seat is one of the key indicators for the safety of rail vehicles. Regarding the seat strength test, in the actual test process, according to the standard, a certain load is applied to key parts such as the seat back, seat cushion, and armrests, and the seat is required to be free from cracks and permanent deformation. Since most of the parts are movable parts with matching gaps, after the seat is loaded, due to the extrusion of the gap, there will be a phenomenon of displacement before and after the load is applied. To determine whether the seat has cracks and permanent deformation, the cu...

AI Technical Summary

Problems solved by technology

However, the stress sheet test also has the following defects: first, the stress sheet can only test local point deformation, and cannot prove the overall skeleton deformation; For structural seats, it is very likely that there will be a difference between the test point and the actual deformation point; again, through the simulation calculation and analysis of the stress, the weakest point is often not on the flat surface, but mostly on the edge of the component or the joint of the rotating shaft. Paste stress sheets; finally, stress sheet testing has a large workload, inconvenient operation, long cycle, and high cost. It is mostly used for scientific research and research, and the actual product testing promotion rate is low.

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