Abstract
The design of products with elastic properties is a paradigm for design engineers because the properties of the material define the correct functionality of the product. Fused filament fabrication (FFF) allows for the printing of products in thermoplastic polyurethanes (TPU). Therefore, it offers the ability to design elastic products with the freedom of forms that this technology allows and also with greater variation of elastic properties than with a conventional process. The internal structures and the variation in thickness that can be used facilitate the design of products with different elastic realities, producing variations in the elasticity of the product with the same material. This work studies the influence of the variation of internal density as a function of basic geometries in order to quantify the difference in elasticity produced on a product when it is designed. Likewise, a case study was carried out with the creation of a fully elastic computer keyboard printed in 3D. The specimens were subjected to compression to characterize the behavior of the structures. The tests showed that the elasticity varies depending on the orientation and geometry, with the highest compressive strength observed in the vertical orientation with 80% lightening. In addition, the internal lightening increases the elasticity progressively but not uniformly with respect to the solid geometry, and also the flat faces favour the reduction in elasticity. This study classifies the behavior of TPU with the aim of being applied to the design and manufacture of products with specific properties. In this work, a totally flexible and functional keyboard was designed, obtaining elasticity values that validate the study carried out.
Highlights
IntroductionThe design and development of new products requires long production processes, representing a large investment for the industry
In order to reduce the time in the development phases, the incorporation of additive manufacturing technologies (AM) is extended to several sectors of the industry [1,2,3]
This study focuses on evaluating the of influence of geometry and structure on the elastic of the material with the objective of applying these internal structure on theproperties elastic properties of the material with the objective of applying properties to the to design of custom products generated by FFFby(Figure these properties the design of custom products generated
Summary
The design and development of new products requires long production processes, representing a large investment for the industry. The AM consists of a set of manufacturing technologies based on the layer-by-layer controlled deposition of the material, directly from digital product data that contain information about the geometry. It offers the ability to develop more complex geometries and structures with a high customization capacity, as well as a significant reduction in manufacturing time and cost. These capabilities have made AM one of the most developed technologies to date, it being very useful when low production volumes and frequent design changes are required [4,5,6]
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