Finite element modelling of load cell hysteresis

Abstract It is well known that mechanical interfaces, such as bolted joints, within load cell elements should be avoided as they can lead to high hysteresis. Less well known is that, particularly for load cells of low aspect ratio, significant hysteresis may result from radial slip at the interface between the load cell and its loading pads. The work reported here quantifies this “contact” hysteresis for circular cylindrical column load cells. Finite element analysis was used to model circular cylindrical load cell elements. Contact stresses were calculated for both increasing and decreasing loads and the contact hysteresis was evaluated. The finite element predictions are shown to be consistent with experimental measurements. Results are presented showing the effect of variation of the contact coefficient of friction, and the aspect ratio of the load cell.