The diagram illustrates two identical Strainlabs Bolts at a constant preload but at an increasing temperature. One bolt is using Strainlabs thermal compensation features but the other one does not. In a temperature increase from approx. 8 ºC to 23 ºC the measured value for the non-compensated bolt increase by 25% relative to the bolt proof load while the compensated bolt remains at a constant value.

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Michael Fransson is an Embedded Systems Engineer working at Strainlabs development laboratory in Stockholm. Michael has expertise in embedded systems and works primarily with embedded software and quality control.

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Strainlabs Bolts measures preload using a patented LED-sensor. Without the thermal compensation a higher or lower preload value than what is correct would be shown at different temperatures.

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All sensors and electrical components are in some way affected by temperature and changes in temperature. This also applies to the actual bolt. In stress mechanics, an axial force (preload) applied to a bolt can be determined by measuring its elongation. However, it is not only the preload force that affects the elongation – but also the surrounding temperature and temperature changes. This is known as thermal expansion or thermal contraction.

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To accurately measure the preload in a bolt the effect on electronics and the bolt elongation caused by thermal variation must be compensated for. The compensation must be accurate, repeatable and with no side effects even in environments with constantly changing temperatures, something that is a key requirement for almost all sensors.

Strainlabs Bolts automatically adapt their preload measurement interval at low temperatures to increase battery lifetime.

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Strainlabs sensors measure the temperature every time a bolt preload value is measured. Each Strainlabs Bolt and its components including the PCB is calibrated to ensure that the preload value is correctly compensated for within the specified operating temperature (-30ºC to +70ºC).  Strainlabs Bolts measures preload using a LED-sensor. The measurements would be inaccurate without an efficient compensation for the thermal effect of the steel and the electronical components. In Strainlabs Analytics, the temperature value is plotted on a graph just like the preload measurements.

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