About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing and Cellular/Lattice Structures: Designs, Realization and Applications
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Presentation Title |
Prediction of Mechanical Properties of Ceramic Honeycombs by Polarimetry Measurements of Epoxy Resin Prototypes. |
Author(s) |
David Koellner, Bastien Tolve-Granier, Swantje Simon, Ken-ichi Kakimoto, Tobias Fey |
On-Site Speaker (Planned) |
David Koellner |
Abstract Scope |
We present a non-destructive approach to determine the cellular ceramics compressive strength and fracture behavior. For this, we correlate the photoelastic stresses of polymer (epoxy) prototypes with the mechanical properties of ceramics (alumina). Regular and inverse epoxy honeycombs are 3-D printed via stereolithography with varying structure angle from -35° to 35°, with negative angles forming an auxetic and positive hexagonal lattice. Photoelastic measurements under mechanical loading reveal regions of excess stress, which directly corresponds to the initial fracture points of the ceramic honeycombs. The photoelastic stress distribution is much more homogeneous for angles of smaller magnitude, which is reflected in highly increased compressive strengths up to 446 ± 156 MPa at 0°. By adapting the geometric structural model from Gibson and Ashby, we show that we can use a non-destructive technique to determine the compressive strength of alumina honeycombs from the median photoelastic stress measured on similar epoxy honeycomb structures. |