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Vol. 10 (2023)

Additive Design Mimics the Strength and Architect of Nature

March 2, 2023


Abstract: It is believed that the best parts’ design and performance is that which mimics the creation of nature. Palm is a very good example of an extra ordinary tree which must attract the attention of engineers and designers. In contrast with other types of trees, palms have a vascular, jumble, and spongy tissue stem instead of a wooden one. This is the reason why palm trees can with stand strong hurricanes while trees cannot. The stem of a palm is composed of three main parts. Those are the main stem body, the central core, and the leaves growing from the central core in circular and axial patterns along the core. This natural combination tissues of different construction provides an extra-flexibility to the main stem, enhance the relative movement of these components, and as a result enables the palm to bend massively without any catastrophic fracture. This exceptional construction inspired the author to design and manufacture a part which mimics the most public tree at the home country. The model was additively manufactured from 316L, tested for bending with and without heat treatment, and compare with cast part of similar material and dimensions. The aim was always to achieve improved mechanical properties and performance of AM parts with complex geometry.


  1. Moghaddam N.S, et al. Achieving superelasticity in additively manufactured NiTi in compression without post-process heat treatment. Scientific Report,, (2019).
  2. Moghaddam, N. S. et al. Metals for bone implants: Safety, design, and efficacy. Biomanufacturing Reviews 2016; 1: 1.
  3. Bansiddhi, A., Sargeant, T., Stupp, S. & Dunand, D. Porous NiTi for bone implants: a review. Acta biomaterialia 2008; 4: 773-782.
  4. Obeidi M. A., " Metal additive manufacturing by laser-powder bed fusion: Guidelines for process optimisation", Results in Engineering, 2022; 15: 100473.
  5. Shabalovskaya, S. A. Surface, corrosion and biocompatibility aspects of Nitinol as an implant material. Bio-medical materials and engineering 2002; 12: 69-109.
  6. Moghaddam, N. S. et al. In Behavior and Mechanics of Multifunctional Materials and Composites XII. 105960H (International Society for Optics and Photonics).
  7. Ibrahim, H. et al. In Vitro Corrosion Assessment of Additively Manufactured Porous NiTi Structures for Bone Fixation Applications. Metals 2018; 8: 164.
  8. Ma, C. et al. improving surface finish and wear resistance of additive manufactured nickel-titanium by ultrasonic nano-crystal surface modification. Journal of Materials Processing Technology 2017; 249: 433-440.
  9. Obeidi M. A., et al., Laser beam powder bed fusion of nitinol shape memory alloy (SMA). Journal Of Materials Research And Technology; 2021; 14: 2554-2570.
  10. Obeidi M. A. et al. Achieving high quality nitinol parts with minimised input thermal energy by optimised pulse wave laser powder bed fusion process. Results in Materials 14 100279, (2022).
  11. Zhao, et al. A 3D dynamic analysis of thermal behaviour during single-pass multi-layer weld-based rapid prototyping. J. Mater. Process. Technol 2011; 211(3): 488-495.
  12. Chen X., et al. Microstructure and mechanical properties of the austenitic stainless steel 316 L fabricated by gas metal arc additive manufacturing. Mater. Sci. Eng. A (2017).
  13. Fachinotti Vc.D, et al. Finite-element modelling of heat transfer in shaped metal deposition and experimental validation Acta Mater., 2012; 60: 6621-6630.
  14. Chen X., et al. Effect of heat treatment on microstructure, mechanical and corrosion properties of austenitic stainless steel 316L using arc additive manufacturing. Materials Science and Engineering: A, (2018).
  15. J. Dutta Majumdar, I. Manna, Laser processing of materials, Sadhana. 2003; 28: 495-562.
  16. Guo Q., et al. In-situ characterization and quantification of melt pool variation under constant input energy density in laser powder bed fusion additive manufacturing process. Additive Manufacturing, (2019).
  17. Farshidianfar M., et al. Effect of real-time cooling rate on microstructure in Laser Additive Manufacturing J. Mater. Process. Technol., 2016; 231: 468-478.
  18. Campanelli S., et al. Analysis of the molten/solidified zone in selective laser melted parts SPIE LASE., 8963, Article 896311. (2014).
  19. Nelson J. Selective Laser Sintering: a Definition of the Process and an Empirical Sintering Model Ph.D. thesis, University of Texas at Austin, Austin, TX (1993)
  20. Schwind M., et al., σ -phase precipitation in stabilized austenitic stainless steels, Acta Mater. 2000; 48(10): 2473-2481.
  21. Olson D., Prediction of austenitic weld metal microstructure and properties, Weld. J. 1985; 281-295.
  22. Lippold J. et al. Solidification of austenitic stainless steel weldments Part III-the effect of solidification behavior on hot cracking susceptibility, Weld. J. 388-396 (1982) G.B. Senay, et al., Prediction of σ phase precipitation in type 316FR stainless steel weld metal, J. Jpn. Weld. Soc. 2013; 31(4): 168s-172s.
  23. Okabayashi H., Mathematical approach to σ phase precipitation in austenitic stainless steel welds, Mater. Trans. 37 (5) 970-974. (1996).
  24. Young, J., "numerical simulation of the unsteady aerodynamics of flapping airfoils", Ph.D. thesis, The University of New South Wales, (2005).
  25. Joshua Ott et al., "Algorithmic-driven design of shark denticle bioinspired structures for superior aerodynamic properties", Bioinspiration & Biomimetics, (2020).
  26. Brucher, R., Rydill, L., "Concepts in submarine design", Cambridge Ocean Technology, Series 2, Department of Mechanical Engineering, University College London, ISBN 0521416817, (1999)
  27. Collins PC, Brice DA, Samimi P, Ghamarian I, Fraser HL. "Microstructural control of additively manufactured metallic materials. Annu Rev Mater Res 2016; 46: 63e91.
  28. Ahmed Obeidi, M., et al. "Comparison of the porosity and mechanical performance of 316L stainless steel manufactured on different laser powder bed fusion metal additive manufacturing machines", Journal of Materials Research and Technology, (2021).