This dataset includes strain and cross-sectional data from two CFRP loop specimens fabricated using coreless filament winding (CFW).

Specimen 1 features both anchors positioned in the same plane, resulting in a “straight” configuration, while specimen 2 has one anchor elevated, creating an “angled” configuration.

Both specimens contain fiber-optic sensors (FOS) operating on the Rayleigh backscattering principle. As the specimens are loops, both sides contain sensors.

The specimens were mechanically tested under different clamping conditions and at various non-destructive load levels. During testing, strain signals were obtained along the entire sensor length, mapped to the geometry, and resampled to 100 measurement points per segment. After testing, the specimens were cut, and their cross-sectional shapes, cut thicknesses, and FOS cross-sectional positions were measured.

The dataset contains 504 text files with strain data, each including a header indicating the measurement location and configurations. All strain values are provided in microstrain. Additionally, the dataset contains 76 text files with the coordinates of each cut (cut 1 of specimen 1 was removed). Each file includes the y and z coordinates in mm of one contour. To estimate the x coordinate, the thickness of the cuts, measured in µm, is provided in a tabular file. Another tabular file contains the positions of the FOS within each cross-section.

To aid understanding of the process and FOS implementation, two illustrative photos are included. To better visualize the sensor locations and configurations during testing, two additional figures are also provided in this dataset.