Strain and shape measurements in composite pipelines

Composite collectors and pipelines were investigated in collaboration with the Warsaw University of Technology. The specimens were equipped with surface-mounted optical fibres for internal and external strain measurements. Thanks to that approach, 3DSensor could be utilised to calculate displacements (shape changes) expressed directly in millimetres. The research included pipe specimens with different geometry of the cross- section.

DFOS Sensors Installed: Optical fibre in acrylate coating

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 strain analysis over the internal and external surface of the pipe
Shape change calculations according to the 3DSensor’s algorithm
Thousands of measurements points within a single element for self-diagnostics
Unique scientific data on structural performance

Results of using the DFOS monitoring system

The above figures show the example results obtained during laboratory load tests. The raw data for further calculations are external strains (left Fig.) and internal strains (middle Fig.). Using the algorithm of the 3DSensor, it was possible to estimate the shape changes during subsequent load steps (right Fig.)

Technical specifications

9 200 measurement points
46 m of sensing path
7 x DFOS strain sensors
short-term (laboratory)

Example results

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