An Experimental Study of Influence of Gradient Parameters on Compressive Strength, Stiffness, and Specific Energy Absorp
The present paper describes an experimental study of influence of gradient parameters on compressive strength, stiffness, and specific energy absorption (SEA) of auxetic structures of ABS and PLA fabricated by FDM. Three gradient parameters, namely thickn
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1 Introduction Structures whose properties are determined by their geometric parameters are widely used in recent times [1]. Negative Poisson’s ratio structures or auxetic structure are one of such meta-materials or structures. They exhibit desirable mechanical properties like high strength-to-weight ratio, indentation resistance, impact resistance, bending stiffness, fracture toughness, vibration damping, hardness, excellent shock absorption capacity than the conventional positive Poisson’s ratio structures [2, 3]. They have applications in field of aerospace, automotive, biomedical, composites, defense, sensors, and textile [4–6]. With recent advances in fused deposition modeling (FDM) which is one technique of additive manufacturing (AM), fabrication of varying density parts has become possible [7–11]. A remarkable advantage of this technique is that it is economical than other AM techniques. Also, the strength of the parts made of FDM is sufficiently high so that they can replace parts made of conventional plastic manufacturing techniques like injection molding. AM is capable to fabricate structures according to functional requirement. Therefore, it is important to realize relation between gradient parameters of a structure and responses like strength, stiffness, specific energy absorption (SEA) to fully utilize the potential of this technique. Many researchers have made efforts to investigate in this domain [12–17]. Also, various researchers have studied gradient structures made by different AM techniques for different loading conditions. Lira et al. [12] studied gradient auxetic structures for use as cores in aero-engine fan blade. Their natural frequencies and mode shapes for first three fundamental modes are studied. The optimized configuration resulted in decrease in mass of fan blade, reduction in dynamic modal displacement, and decrease in first three natural frequencies. Boldrin S. Vyavahare · S. Teraiya · S. Kumar (B) Sardar Vallabhbhai National Institute of Technology, Surat 395007, Gujarat, India e-mail: [email protected] © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021 H. K. Dave and D. Nedelcu (eds.), Advances in Manufacturing Processes, Lecture Notes in Mechanical Engineering, https://doi.org/10.1007/978-981-15-9117-4_23
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et al. [13] studied visco-acoustic behavior of auxetic gradient honeycomb structures. Two types of gradient cellular configurations are studied by varying internal cell wall angle and by varying cell wall aspect ratio across surface of honeycomb. It was found that only specific gradient topology shows significant sensitivity of dynamic properties versus change in gradient geometry. Hou et al. [14] proposed novel design for energy dissipating structures using gradient auxetic configuration. Optimization is also performed to minimize mass of crash box with constraints of crash-resistant force and energy absorption. Chen et al. [15] studied cylindrical structures with triangular and hexagonal configurations for imp
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