Fatigue strain measurements in different layers of a road structure

EpsilonSensors were embedded inside the laboratory field, simulating the real road structure. Both longitudinal (X) and transverse (Y) sections were investigated at two levels: in the aggregate (lower) and asphalt (upper) layer. The internal nervous system allowed for detailed analysis of structural behaviour (strain distributions over the length and strain development over time) during fatigue loads (1,000,000 load cycles). Data were used for FEA validation and further optimisations.

DFOS Sensors Installed: EpsilonSensor

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Simultaneous strains measurements inside the aggregate and asphalt layers
Realiable high-frequency data during fatigue tests (1,000,000 load cycles)
Thausands of measurement points without reinforcing the road layers
Detailed scientific data for design procedures, FEA validation and optimisation

Results of using the DFOS monitoring system

The plots above show example (at selected time) strain distributions over the length of the sensors embedded inside the aggregate and asphalt layer. At the same time, two layers and two directions (X, Y) were investigated with 25 Hz frequency.

Technical specifications

1 153 measurement points
6 m of sensing path
4 x EpsilonSensor
short-term (laboratory)

Example results

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John Doe

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