A multi-loading, climate-controlled, stationary ROI device for in-situ X-ray CT hygro-thermo-mechanical testing
| Autor: | N.H. Vonk, M.P.F.H.L. van Maris, Johan P.M. Hoefnagels, E.C.A. Dekkers |
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| Přispěvatelé: | Mechanics of Materials, Equipment and Prototype Center, Group Geers, Group Hoefnagels |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
X-ray computed tomography
Materials science Climate control Mechanical Engineering Aerospace Engineering Mechanical engineering Micromechanics 02 engineering and technology Bending 021001 nanoscience & nanotechnology Displacement (vector) Clamping Characterization (materials science) In-situ mechanical testing 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Region of interest Solid mechanics Fracture (geology) Multi Loading Micro-mechanics 0210 nano-technology Stationary ROI |
| Zdroj: | Experimental Mechanics, 59(3), 295-308. Springer |
| ISSN: | 0014-4851 |
| Popis: | In-situ CT mechanical testing yields a full 3D description of a sample material’s behaviour under specific loads. In the literature various devices are proposed which enable in-situ CT hygro-, thermo- or mechanical testing, each with its own merits and limitations. However none of them is able to perform advanced hygro-thermo-mechanical tests on specimens subjected to multiple loading modes, while accurately controlling and measuring the force, displacement, temperature and relative humidity in real time. Therefore, this work proposes an in-situ CT device which allows such multi-faceted experiments. Improvements to the current state-of-the-art devices include: (1) a compact, lightweight and rotationally symmetric design that enables high-resolution CT scans by minimization of wobble during scanning, in practically all lab-scale CT scanners; (2) a stationary region of interest by loading the sample from both sides, which enables high resolution CT characterization of materials exhibiting a large fracture strain; and (3) improved testing modularity by exchanging clamping methods to allow samples of various sizes (e.g., circular or rectangular) to be inserted in a variety of ways, thereby facilitating complex experiments such as three- or four-point bending tests. Validation experiments demonstrate that stringent requirements on CT resolution, loading and displacement accuracy and climate control are met. Furthermore, the in-situ testing capabilities of the device were validated by CT characterization of the creasing and folding process of multi-layer cardboard under varying (controlled) levels of relative humidity and temperature. |
| Databáze: | OpenAIRE |
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