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Folding behavior of thermoplastic hinges fabricated with polymer extrusion additive manufacturing

  • Cesar Omar Balderrama-ArmendarizEmail author
  • Eric MacDonald
  • David A. Roberson
  • Leopoldo Ruiz-Huerta
  • Aide Maldonado-Macias
  • Esdras Valadez-Gutierrez
  • Alberto Caballero-Ruiz
  • David Espalin
ORIGINAL ARTICLE

Abstract

Due to the layer-by-layer nature of additive manufacturing, fabricated parts suffer from an anisotropic behavior with reduced mechanical performance when compared to traditional manufacturing. One specific mechanical property, folding endurance, requires both low flexural strength and simultaneously high elongation to achieve the flexibility needed to sustain repetitive bending. The present work provides an analysis of selected thermoplastics’ flexural capacity, including nylon (PA), polyethylene terephthalate (PETG), polylactide (PLA), thermoplastic polyurethane (TPU), polypropylene (PP), polyethylene (PE), and a TPR blend (ABSMG94: SEBS-g-MA 25:75), in order to evaluate the maximum number of folding cycles and load capacity sustained by a living hinge. A fractographic analysis was performed using scanning electron microscopy and computed tomography. Similar to the performance of injected molded products, the experimental results demonstrated that three of the tested materials behaved well in the context of a large number of folding cycles prior to an eventual detachment into two pieces; TPR blend, 244,424 cycles; PP endured one million cycles; and TPU, more than two million cycles, while the remaining materials failed to survive more than 1000 cycles. The hinges failure analysis revealed a wide variety of fracture morphologies and failure modes. In regard to the load capacity, PLA, PETG, and nylon provided the highest results in the ultimate strength of an axial static force applied (790.61 N, 656.06 N, and 652.75 N respectively), while the TPR blend was the highest (398.44 N) of the elastomeric materials (PP, TPU, and TPR blend). The evaluated materials demonstrated enough flexibility for use in specific applications such as stretchable electronics and wearable applications.

Keywords

Polymer extrusion Additive manufacturing Folding endurance Flexible 3D printed materials Flexible Aplications Fused deposition 

Notes

Acknowledgments

The research presented here was conducted in the Rapid Prototyping Lab at the Universidad Autónoma de Ciudad Juárez (Autonomous University of Ciudad Juarez) in Collaboration with The University of Texas at El Paso (UTEP) in the W.M. Keck Center for 3D Innovation. The Friedman Chair for Manufacturing at Youngstown State University also supported the work.

Funding information

Funding for this work was provided by the AFOSR through the Young Investigator Program (YIP) under grant number FA9550-14-1-0260 and the Defense University Instrumentation Program (DURIP) under grant number FA9550-15-1-0312.

References

  1. 1.
    Melnikova R, Ehrmann A, Finsterbusch K (2014) 3D printing of textile-based structures by fused deposition modelling (FDM) with different polymer materials. IOP Conf Ser Mater Sci Eng 62:012018CrossRefGoogle Scholar
  2. 2.
    Irwin MD, Roberson DA, Olivas RI, Wicker RB, MacDonald E (2011) Conductive polymer-coated threads as electrical interconnects in e-textiles. Fibers Polym 12:904–910CrossRefGoogle Scholar
  3. 3.
    Rocío R, Ruiz-Huerta L, Almanza-Arjona YC et al (2017) Nanocomposites for additive manufacturing. Am J Chem Res 1:1–14Google Scholar
  4. 4.
    Spahiu T, Piperi E, Grimmelsmann N et al (2016) 3D printing as a new technology for apparel designing and manufacturing. In: International Textile ConferenceGoogle Scholar
  5. 5.
    MacDonald E, Wicker R (2016) Multiprocess 3D printing for increasing component functionality. Science 353:aaf2093.  https://doi.org/10.1126/science.aaf2093 CrossRefGoogle Scholar
  6. 6.
    Muth JT, Vogt DM, Truby RL, Mengüç Y, Kolesky DB, Wood RJ, Lewis JA (2014) Embedded 3D printing of strain sensors within highly stretchable elastomers. Adv Mater 26:6307–6312CrossRefGoogle Scholar
  7. 7.
    Cao Q, Kim H-S, Pimparkar N, Kulkarni JP, Wang C, Shim M, Roy K, Alam MA, Rogers JA (2008) Medium-scale carbon nanotube thin-film integrated circuits on flexible plastic substrates. Nature 454:495–500CrossRefGoogle Scholar
  8. 8.
    Ko SH, Pan H, Grigoropoulos CP, Luscombe CK, Fréchet JMJ, Poulikakos D (2007) All-inkjet-printed flexible electronics fabrication on a polymer substrate by low-temperature high-resolution selective laser sintering of metal nanoparticles. Nanotechnology 18:345202CrossRefGoogle Scholar
  9. 9.
    Ahn J-H, Kim H-S, Lee KJ, Jeon S, Kang SJ, Sun Y, Nuzzo RG, Rogers JA (2006) Heterogeneous three-dimensional electronics by use of printed semiconductor nanomaterials. Science 314:1754–1757CrossRefGoogle Scholar
  10. 10.
    Telfer S, Munguia J, Pallari J, Dalgarno K, Steultjens M, Woodburn J (2014) Personalized foot orthoses with embedded temperature sensing: proof of concept and relationship with activity. Med Eng Phys 36:9–15CrossRefGoogle Scholar
  11. 11.
    Ma RR, Odhner LU, Dollar AM (2013) A modular, open-source 3D printed underactuated hand. In: 2013 IEEE International Conference on Robotics and AutomationGoogle Scholar
  12. 12.
    Lipson H (2014) Challenges and opportunities for design, simulation, and fabrication of soft robots. Soft Rob 1:21–27CrossRefGoogle Scholar
  13. 13.
    Umedachi T, Vikas V, Trimmer BA (2013) Highly deformable 3-D printed soft robot generating inching and crawling locomotions with variable friction legs. In: 2013 IEEE/RSJ International Conference on Intelligent Robots and SystemsGoogle Scholar
  14. 14.
    Rossiter J, Walters P, Stoimenov B (2009) Printing 3D dielectric elastomer actuators for soft robotics. In: Electroactive Polymer Actuators and Devices (EAPAD) 2009Google Scholar
  15. 15.
    Bartlett NW, Tolley MT, Overvelde JTB, Weaver JC, Mosadegh B, Bertoldi K, Whitesides GM, Wood RJ (2015) SOFT ROBOTICS. A 3D-printed, functionally graded soft robot powered by combustion. Science 349:161–165CrossRefGoogle Scholar
  16. 16.
    Croccolo D, De Agostinis M, Olmi G (2013) Experimental characterization and analytical modelling of the mechanical behaviour of fused deposition processed parts made of ABS-M30. Comput Mater Sci 79:506–518CrossRefGoogle Scholar
  17. 17.
    Torrado Perez AR, Roberson DA, Wicker RB (2014) Erratum to: Fracture surface analysis of 3D-printed tensile specimens of novel ABS-based materials. J Fail Anal Prev 14:549–549CrossRefGoogle Scholar
  18. 18.
    Bellini A, Güçeri S (2003) Mechanical characterization of parts fabricated using fused deposition modeling. Rapid Prototyp J 9:252–264CrossRefGoogle Scholar
  19. 19.
    Es-Said OS, Foyos J, Noorani R, Mendelson M, Marloth R, Pregger BA (2000) Effect of layer orientation on mechanical properties of rapid prototyped samples. Mater Manuf Process 15:107–122CrossRefGoogle Scholar
  20. 20.
    Bagsik A, Schöppner V, Klemp E (2010) FDM part quality manufactured with Ultem* 9085. In: DMRC (ed) International Science Conference Polymeric MaterialsGoogle Scholar
  21. 21.
    Torrado AR, Shemelya CM, English JD, Lin Y, Wicker RB, Roberson DA (2015) Characterizing the effect of additives to ABS on the mechanical property anisotropy of specimens fabricated by material extrusion 3D printing. Addit Manuf 6:16–29CrossRefGoogle Scholar
  22. 22.
    Lee CS, Kim SG, Kim HJ, Ahn SH (2007) Measurement of anisotropic compressive strength of rapid prototyping parts. J Mater Process Technol 187-188:627–630CrossRefGoogle Scholar
  23. 23.
    Wu W, Geng P, Li G, Zhao D, Zhang H, Zhao J (2015) Influence of layer thickness and raster angle on the mechanical properties of 3D-printed PEEK and a comparative mechanical study between PEEK and ABS. Materials 8:5834–5846CrossRefGoogle Scholar
  24. 24.
    Lee BH, Abdullah J, Khan ZA (2005) Optimization of rapid prototyping parameters for production of flexible ABS object. J Mater Process Technol 169:54–61CrossRefGoogle Scholar
  25. 25.
    Vega V, Clements J, Lam T et al (2010) The effect of layer orientation on the mechanical properties and microstructure of a polymer. J Mater Eng Perform 20:978–988CrossRefGoogle Scholar
  26. 26.
    Roberson DA, Torrado Perez AR, Shemelya CM, Rivera A, MacDonald E, Wicker RB (2015) Comparison of stress concentrator fabrication for 3D printed polymeric izod impact test specimens. Addit Manuf 7:1–11CrossRefGoogle Scholar
  27. 27.
    Balderrama-Armendariz CO, MacDonald E, Espalin D, Cortes-Saenz D, Wicker R, Maldonado-Macias A (2018) Torsion analysis of the anisotropic behavior of FDM technology. Int J Adv Manuf Technol 96:307–317.  https://doi.org/10.1007/s00170-018-1602-0 CrossRefGoogle Scholar
  28. 28.
    Torres J, Cotelo J, Karl J, Gordon AP (2015) Mechanical property optimization of FDM PLA in shear with multiple objectives. JOM 67:1183–1193CrossRefGoogle Scholar
  29. 29.
    ASTM (2007) Standard test method for folding endurance of paper by the M.I.T. tester. ASTM InternationalGoogle Scholar
  30. 30.
    International Organization for Standardization (1993) Test method for folding endurance of paper by the M.I.T. tester. ISOGoogle Scholar
  31. 31.
    Mraz S (2004) Care and feeding of living hinges. In: Machine design. http://www.machinedesign.com/fasteners/care-and-feeding-living-hinges. Accessed 29 May 2018
  32. 32.
    USP (2017) Polypropylene hinge. In: United States Plastic Corp. https://www.usplastic.com/search/default.aspx?it=item&keyword=Polypropylene%20Hinge
  33. 33.
    Siqueiros JG, Gilberto Siqueiros J, Schnittker K, Roberson DA (2016) ABS-maleated SEBS blend as a 3D printable material. Virtual Phys Prototyp 11:123–131CrossRefGoogle Scholar
  34. 34.
    Meng Q, Li Y, Xu J (2013) New empirical stiffness equations for corner-filleted flexure hinges. Mech Sci 4:345–356CrossRefGoogle Scholar
  35. 35.
    Dirksen F, Lammering R (2011) On mechanical properties of planar flexure hinges of compliant mechanisms. Mech Sci 2:109–117CrossRefGoogle Scholar
  36. 36.
    Zhu Z, Zhou X, Wang R, Liu Q (2014) A simple compliance modeling method for flexure hinges. Sci China Technol Sci 58:56–63CrossRefGoogle Scholar
  37. 37.
    Smyth CT (2017) Functional design for 3D printing: designing 3D printed things for everyday use, 3rd ednGoogle Scholar
  38. 38.
    ASTM Committee F42 on Additive Manufacturing Technologies, ASTM Committee F42 on Additive Manufacturing Technologies. Subcommittee F42.01 on Test Methods, Technical Committee ISO/TC 261, Additive Manufacturing (2013) Standard terminology for additive manufacturing--coordinate systems and test methodologiesGoogle Scholar
  39. 39.
    Engel L (1981) An atlas of polymer damage: surface examination by scanning electron microscope, Wiley-BlackwellGoogle Scholar

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Cesar Omar Balderrama-Armendariz
    • 1
    • 2
    Email author
  • Eric MacDonald
    • 3
  • David A. Roberson
    • 4
  • Leopoldo Ruiz-Huerta
    • 2
    • 5
  • Aide Maldonado-Macias
    • 6
  • Esdras Valadez-Gutierrez
    • 1
  • Alberto Caballero-Ruiz
    • 2
    • 5
  • David Espalin
    • 7
  1. 1.Rapid Prototyping LaboratoryUniversidad Autónoma de Ciudad JuárezCiudad JuarezMexico
  2. 2.National Laboratory for Additive and Digital Manufacturing (MADiT)MexicoMexico
  3. 3.Advanced Manufacturing Research CenterYoungstown State UniversityYoungstownUSA
  4. 4.Polymer Extrusion LabThe University of Texas at El PasoEl PasoUSA
  5. 5.Instituto de Ciencias Aplicadas y TecnologíaUniversidad Nacional Autónoma de MéxicoCd. Mx.Mexico
  6. 6.Department of Industrial and Manufacturing EngineeringUniversidad Autónoma de Ciudad JuárezChihuahuaMexico
  7. 7.W. M. Keck Center for 3D InnovationThe University of Texas at El PasoEl PasoUSA

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