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DVC analysis of mat glass fiber reinforced polymer applying heterogeneous mechanical regularization at the mesoscale

The analysis of the behavior of materials with complex and/or heterogeneous microstructures at low scales calls for the enhancement of full-filed measurement techniques. For homogenous materials with complex microstructure (e.g., cellular materials) Architecture-Driven Digital Image Correlation Technique (ADDICT) approaches are considered. The proposed digital image correlation (DIC) framework consists of a weak regularization using an elastic B-spline image-based model. Even more challenging scenarios arise for heterogeneous materials (e.g., fiber reinforced polymers or FRPs) where the presence of different constituents that possess specific material properties result in complex strain localization and damage phenomena. This challenge can be addressed with the application of FE-DIC based upon heterogeneous mechanical regularization. The proposed methodology treats differently phases of the heterogeneous material by taking into account the contrast of their elastic properties. The same principle can be adapted to heterogeneous materials in a Digital Volume Correlation (DVC) frameworks.

Fibrous Material ; X-Ray Computed Tomography ; Digital Volume Correlation ; Mechanical Regularization

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