engleski

Damage characterization via Digital Volume Correlation: Application to an in-situ cyclic test on glass fiber reinforced polymer

X-Ray Computed Tomography (XCT) coupled with Digital Volume Correlation (DVC) enables for in- situ measurements of bulk displacements and calculation of 3D strain maps. Capturing the bulk kinematics and microstructural changes is crucial in understanding the complex behavior of fiber reinforced polymers (FRPs) as various damage mechanisms are induced on different scales in such heterogeneous materials. The in-situ cyclic tensile test reported herein was performed on a dogbone specimen made of a glass fiber mat reinforced polyester resin. The experiment was imaged via XCT, while the bulk kinematics was measured via global DVC based on finite element (FE) discretizations of the inspected Region of Interest (ROI). Damage mechanisms were identified by laying the correlation residuals (corresponding to the gray level difference between the reference volume and the volume of the deformed material corrected by the measured displacement field) and major eigen strain fields over the corresponding mesostructure sections. They are further compared to the deformed volumes. Last, damage growth was quantified by analyzing major eigen strain and correlation residual histograms.

Digital Volume Correlation ; Damage ; Fiber reinforced Polymer ; Gray level residuals

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