A novel test fixture for mode III fracture characterization of monolithic laminates and composite sandwich specimens
| Autor: | Christian Berggreen, Lujin Lin, Pietro Sabbadin, Brian Nyvang Legarth |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Test fixture Mechanical Engineering Composite number Test rig 02 engineering and technology 021001 nanoscience & nanotechnology Characterization (materials science) 020303 mechanical engineering & transports Fracture toughness 0203 mechanical engineering Mechanics of Materials Materials Chemistry Ceramics and Composites Fracture (geology) Composite material 0210 nano-technology |
| Zdroj: | Journal of Composite Materials. 55:3493-3510 |
| ISSN: | 1530-793X 0021-9983 |
| DOI: | 10.1177/00219983211020107 |
| Popis: | This work presents a novel test fixture for mode III fracture characterization of delaminations in monolithic laminates and face-core debonds in foam core composite sandwich specimens. The test fixture is configured as an extension of the already existing shear-torsion-bending (STB) test designed for monolithic laminates. The specimen sizing, lay-up configuration and the manufacturing process are presented. Accordingly, an overview of the test fixture is provided along with the data reduction method employed to compute the energy release rate. The results from representable fracture characterization tests are presented as force vs. displacement curves, where different definitions of the critical load for crack propagation can be defined. Thus, the critical value of the energy release rate is computed using analytically based equations for the different definitions given for the critical loads. The results show a stable crack growth for monolithic laminate specimens. However, a highly non-linear response of the sandwich specimens, before the onset of crack propagation, is observed. A non-linear numerical analysis and destructive specimen inspections are carried out in order to identify the source of the non-linear behaviour observed in the experimental results. |
| Databáze: | OpenAIRE |
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