Influence of 3D-Printed TPU Properties for the Design of Elastic Products

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.

Automated summary

Designing products with elastic properties is a crucial task for engineers, as the material properties play a significant role in defining the functionality of the product. Using Fused Filament Fabrication (FFF) to print products in thermoplastic polyurethanes (TPU) allows for the design of elastic products with a variety of forms and elastic properties. Internal structures and variations in thickness can be utilized to create products with different elastic characteristics. The study also investigates the influence of internal density variation on product elasticity, with a case study on a fully elastic 3D-printed keyboard. The results show that elasticity can be affected by orientation, geometry, and internal lightening, providing insights for designing products with specific properties.