New experimental techniques for fracture testing of highly deformable materials
A new experimental method for measuring strain fields in highly deformable materials has been developed. This technique is based on an in-house developed Digital Image Correlation (DIC) system capable of accurately capturing localized or non-uniform strain distributions. Thanks to the implemented al...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2015-12-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1640 |
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| _version_ | 1841562838015934464 |
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| author | E. Dall’Asta V. Ghizzardi R. Brighenti E. Romeo R. Roncella A. Spagnoli |
| author_facet | E. Dall’Asta V. Ghizzardi R. Brighenti E. Romeo R. Roncella A. Spagnoli |
| author_sort | E. Dall’Asta |
| collection | DOAJ |
| description | A new experimental method for measuring strain fields in highly deformable materials has been developed. This technique is based on an in-house developed Digital Image Correlation (DIC) system capable of accurately capturing localized or non-uniform strain distributions. Thanks to the implemented algorithm based on a Semi-Global Matching (SGM) approach, it is possible to constraint the regularity of the displacement field in order to significantly improve the reliability of the evaluated strains, especially in highly deformable materials. Being originally introduced for Digital Surface Modelling from stereo pairs, SGM is conceived for performing a one-dimensional search of displacements between images, but here a novel implementation for 2D displacement solution space is introduced. SGM approach is compared with the previously in-house developed implementation based on a local Least Squares Matching (LSM) approach. A comparison with the open source code Ncorr and with some FEM results is also presented. The investigation using the present DIC method focuses on 2D full-field strain maps of plain and notched specimens under tensile loading made of two different highly deformable materials: hot mix asphalt and thermoplastic composites for 3D-printing applications. In the latter specimens, an elliptical hole is introduced to assess the potentiality of the method in experimentally capturing high strain gradients in mixed-mode fracture situations. |
| format | Article |
| id | doaj-art-420aca2c25154d89bddadb6f9071b38b |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2015-12-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-420aca2c25154d89bddadb6f9071b38b2025-01-03T00:39:50ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932015-12-01103510.3221/IGF-ESIS.35.019New experimental techniques for fracture testing of highly deformable materialsE. Dall’AstaV. GhizzardiR. BrighentiE. RomeoR. RoncellaA. SpagnoliA new experimental method for measuring strain fields in highly deformable materials has been developed. This technique is based on an in-house developed Digital Image Correlation (DIC) system capable of accurately capturing localized or non-uniform strain distributions. Thanks to the implemented algorithm based on a Semi-Global Matching (SGM) approach, it is possible to constraint the regularity of the displacement field in order to significantly improve the reliability of the evaluated strains, especially in highly deformable materials. Being originally introduced for Digital Surface Modelling from stereo pairs, SGM is conceived for performing a one-dimensional search of displacements between images, but here a novel implementation for 2D displacement solution space is introduced. SGM approach is compared with the previously in-house developed implementation based on a local Least Squares Matching (LSM) approach. A comparison with the open source code Ncorr and with some FEM results is also presented. The investigation using the present DIC method focuses on 2D full-field strain maps of plain and notched specimens under tensile loading made of two different highly deformable materials: hot mix asphalt and thermoplastic composites for 3D-printing applications. In the latter specimens, an elliptical hole is introduced to assess the potentiality of the method in experimentally capturing high strain gradients in mixed-mode fracture situations.https://www.fracturae.com/index.php/fis/article/view/1640Digital Image CorrelationHighly Deformable MaterialsMixed-mode fractureMasticPolylactide |
| spellingShingle | E. Dall’Asta V. Ghizzardi R. Brighenti E. Romeo R. Roncella A. Spagnoli New experimental techniques for fracture testing of highly deformable materials Fracture and Structural Integrity Digital Image Correlation Highly Deformable Materials Mixed-mode fracture Mastic Polylactide |
| title | New experimental techniques for fracture testing of highly deformable materials |
| title_full | New experimental techniques for fracture testing of highly deformable materials |
| title_fullStr | New experimental techniques for fracture testing of highly deformable materials |
| title_full_unstemmed | New experimental techniques for fracture testing of highly deformable materials |
| title_short | New experimental techniques for fracture testing of highly deformable materials |
| title_sort | new experimental techniques for fracture testing of highly deformable materials |
| topic | Digital Image Correlation Highly Deformable Materials Mixed-mode fracture Mastic Polylactide |
| url | https://www.fracturae.com/index.php/fis/article/view/1640 |
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