Experimental analysis at different loading rates of 3D printed polymeric auxetic structure based on cylindrical elements. (February 2023)

• Record Type: Journal Article
• Authors: Varas, D.; Pernas-Sánchez, J.; Fjeldberg, N.; Martín-Montal, J.
• Is Part Of: Polymer testing. Volume 119(2023)
• Publication Date: 2023-02
• Subjects: Auxetic structure -- Dynamic regime -- Split Hopkinson Pressure Bar -- Additive manufacture; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2023.107930
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: This work proposes the experimental study of an auxetic polymeric structure manufactured by 3D printing (SLA). The structure is composed by a re-entrant unit cell based on cylindrical elements not previously studied. The effect of the number and size/scale of the unit cells used in the specimens, subjected to both static and dynamic loads, has been analysed. The results show how the studied variables affect the behaviour of the structure in terms of stress and strain and that the dimensions of the cylindrical elements, as well as the contact between them, could help to modify the stiffness structure as required. The tests performed have allowed to understand the sequence of physical phenomena that appears at different strain rates and how they affect the response of the structure. The results obtained may contribute to the knowledge of both polymeric auxetic structures and the use of additive manufacturing methods for such structures. Graphical abstract: Highlights: Development of a 3D auxetic polymeric cell by means of SLA manufacturing technique. Experimental study of a polymeric auxetic structure under different loading rates. Effect of the cells´ number and size on the mechanical response of the structure. The cylinder-based unit cell could lead to control the stiffness of the structure. Analysis of physical phenomena in the auxetic structure at different loading rates.