Crushing Behavior of Graded Auxetic Structures Built from Inverted Tetrapods under Impact

Novak N, Borovinsek M, Vesenjak M, Wormser M, Körner C, Tanaka S, Hokamoto K, Ren Z (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

physica status solidi (b) Wiley

Publisher: Wiley-VCH Verlag

DOI: 10.1002/pssb.201800040

Abstract

In this study, the crushing behavior of auxetic structures built from inverted tetrapods with linearly graded porosity under impact is analyzed both experimentally and computationally. The auxetic samples with linearly graded porosity are fabricated from Ti‐6Al‐4V alloy powder by the selective electron‐beam melting method. A detailed geometrical analysis of the fabricated samples based on micro computed tomography (microCT) scans is performed to determine the variation of strut thickness and other fabrication imperfections. The samples are subjected to high strain rate compression loading in two specimen orientations (specimens with low or high porosity facing the impacting plate) using the powder gun. Appropriate computational models are later developed and validated to provide a more detailed insight into the crushing mechanism of auxetic structures during impact. The experimental and computational results show dependency of the plateau stress inclination (progressive/regressive) on the gradation of the auxetic cellular structures (specimens with low or high porosity in front). These initial results prove that it is possible to tailor the mechanical behavior of a porous structure with introduction of graded porosity, especially in the case of high strain rate impact, where the main deformation occurs at the impacting front.

Authors with CRIS profile

Maximilian Wormser Zentralinstitut für Neue Materialien und Prozesstechnik Carolin Körner Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

Related research project(s)

Activity Cellular mechanical metamaterials Jan. 1, 2005 - Jan. 1, 2008

Involved external institutions

Kumamoto University / 熊本大学 JP Japan (JP) University of Maribor (UM) / Univerza v Mariboru SI Slovenia (SI)

How to cite

APA:

Novak, N., Borovinsek, M., Vesenjak, M., Wormser, M., Körner, C., Tanaka, S.,... Ren, Z. (2018). Crushing Behavior of Graded Auxetic Structures Built from Inverted Tetrapods under Impact. physica status solidi (b). https://dx.doi.org/10.1002/pssb.201800040

MLA:

Novak, Nejc, et al. "Crushing Behavior of Graded Auxetic Structures Built from Inverted Tetrapods under Impact." physica status solidi (b) (2018).

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