In‐situ CT Tensile Damage Characterization of Carbon/Glass Hybrid Laminates via Image Reconstruction and Digital Volume Correlation

ABSTRACT This study conducted an in‐situ computed tomography (CT) characterization investigation on the damage evolution mechanisms of carbon/glass fiber reinforced plastic (G/CFRP) stacking as [G0/90 ₃ ,C0/90 ₂ ,G0/90 ₃ ] _s under tensile loading, utilizing image reconstruction and digital volume correlation (DVC) techniques. Through μCT, microstructural images of the specimen were captured at various tensile loading stages. Three‐dimensional reconstruction algorithms were employed to construct models for analyzing void distribution, fiber fracture, and interlaminar failure behaviors. Experimental results demonstrated that the damage evolution in C/GFRP primarily manifests as initial void propagation, interlaminar crack initiation, and heterogeneous fiber interfacial failure, with substantial void expansion exerting significant influence on mechanical properties. DVC analysis further revealed the strain field distribution within the specimen, identifying strain concentration zones predominantly at the interface between carbon and glass fiber layers. These strain fields exhibited progressive expansion along the thickness direction with increasing load. Combined analysis with stress–strain curves revealed accelerated damage evolution rates in glass fiber layers, leading to overall material strength degradation. By integrating μCT and DVC methodologies, this research provides microscopic experimental evidence for understanding damage mechanisms in C/GFRP, while offering theoretical support for the design and optimization of low‐cost hybrid laminates.