P2.5 Investigations to Determine the Clamping Force of Screw Connections
- SMSI 2020
(did not take place because of Covid-19 virus pandemic)
- SMSI 2020 - Sensors and Instrumentation
- P2 Sensors and Measurement Systems for Physical Quantities
- T. Frank, A. Grün, H. Jayaprakash, M. Kermann, S. Jagomast, A. Cyriax, C. Maier, T. Ortlepp - Forschungsinstitut für Mikrosensorik GmbH, Erfurt (Germany)
- 234 - 235
A screw is a machine element for frictional connection of two or more components. Particularly securi-ty-relevant connections require regular checks. Subsequent checking of the assembly preload is not possible without various additional measures. It is advantageous to monitor the assembly preload. The article describes two methods for determining the clamping force using silicon strain gauges. The clamping force stretches the screw shaft, compresses the elements to be joined and deforms both the screw head and the nut or washer. The deformation of the screw head or the washer contains all in-formation about the clamping force. The described use of the silicon strain gauges enables the defor-mation to be precisely recorded. The clamping force can be determined via the deformation.