Data for: Dielectric Breakdown Strength of Unidirectional Fiber Composites: Weibull Analysis of Fiber Orientation and Size Effects

The dataset contains experimental data from dielectric strength testing of unidirectional glass fiber–epoxy composites. The composite laminates were manufactured by pressing prepregs and exhibited low porosity. Testing was performed in a Phenix 6CC100-5/D149 under alternating voltage according to ASTM D149-20. Electrodes and specimen were submerged in transformer oil to prevent surface flashover. Flat, parallel electrodes covering the entire specimens were used to apply a continuously increasing potential difference, corresponding to an electric field increase of 0.25 (kV/mm)/s. Samples with varying fiber angles relative to the applied electric field (0°, 30°, 45°, 60°, 90°), electrode gaps (2 mm, 4 mm, 8 mm, 16 mm), and cross-sectional areas (30 mm², 50 mm², 70 mm²) were tested. Specimens for which a clearly carbonized breakdown path in the material could not be visually identified after the first test were subjected to a second test.