DETERMINATION OF THE STRESS AND DEFORMATION STATE OF ELASTIC ELEMENTS OF TENSION METER FORCE SENSORS
Abstract
The article shows that when measuring forces with weighing devices in long-term dynamic processes, the preservation of metrological parameters of tensor-resistor force sensors in a certain time interval acquires special importance.
The causes of similar failures of force sensors can be fatigue phenomena occurring in the material of the elastic element. Functional failure associated with fatigue phenomena of the material of the elastic element is usually observed long before its complete destruction. Therefore, force-measuring chains of weighing devices are made in such a way that the elastic element works in the zone of elastic deformations.
This is also explained by the fact that in the presence of plastic deformations, hysteresis phenomena appear which reduces the accuracy of measurements.
The existence of various forms of elastic elements causes mathematical difficulties when solving the corresponding problems of the theory of elasticity. At the same time, accounting for the dynamic terms of external influences on the elastic element significantly complicates the process of constructing a solution. Without taking into account dynamic components, it is difficult to perform optimal design of elastic elements of force sensors of weighing systems.
As the analysis of research and well-known publications showed, it is absolutely necessary to determine the stress-strain state of elastic elements using one of the effective types of numerical calculation methods – the finite element method, which is the basis of the ANSYS finite element package and allows designing the structures of force measuring devices when loads change in a wide range.
The analysis of the results of the research of the VAT of the elastic element of the cylindrical force sensor with cutouts shows that the location of the tensor resistors at the minimum distance to the axis of symmetry of the elastic element, in the zone of maximum deformations, is optimally chosen, which allows to reduce the influence of negative factors on the accuracy and stability of the measurement results.
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