Automated monitoring of the crack propagation in mode I testing of thermoplastic composites by means of digital image correlation
| Autor: | V. Grasser, Gerald Pinter, Markus Wolfahrt, Anastasiia Khudiakova, C. Blumenthal |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Strain energy release rate
chemistry.chemical_classification Digital image correlation Materials science Thermoplastic Polymers and Plastics Organic Chemistry Delamination Crack tip opening displacement Fracture mechanics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Displacement (vector) 0104 chemical sciences Fracture toughness chemistry Composite material 0210 nano-technology |
| Zdroj: | Polymer Testing. 82:106304 |
| ISSN: | 0142-9418 |
| DOI: | 10.1016/j.polymertesting.2019.106304 |
| Popis: | One of the main challenges of the mode I double cantilever beam (DCB) test is the simultaneous determination of the applied load and displacement with the developing delamination length. The present work addresses this issue by side-view tracking the crack propagation by means of digital image correlation (DIC). Two different reduction methods were developed to determine the crack length from the DIC data. On the one hand, the crack tip position was defined by the high strain concentration in the immediate vicinity of the crack tip, and on the other hand, by crack tip opening displacement (CTOD). The data obtained enabled the calculation of the energy release rate of carbon fibre reinforced thermoplastic specimens with either run-arrest or stable crack extension. For reasons of comparability, top surface analysis (TSA), as recently reported, was also carried out. Following this approach, the crack propagation was tracked applying DIC to the top specimen surface. The methods developed showed a good correlation with both the standardised procedure and TSA. It was shown that DIC can be used as an alternative to the conventional optical measuring tools to follow the crack propagation in the mode I DCB test. |
| Databáze: | OpenAIRE |
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