AMS Spring 2023

Solar Race Car Gets Aluminum 3D Printed Roll Cage

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3D printing has proven time and again to be a powerful enabling technology for specialty sectors like motor sports. There, it can be leveraged for experimental applications that demonstrate the wider potential of 3D printing to reduce weight and improve efficiency. In one recent example, Uniformity Labs was able to produce an aluminum alloy roll cage for a solar powered race car, showcasing the possibilities for metal 3D printing with aluminum powder.

Using an in-house SLM 280 2.0 dual laser powder bed fusion 3D printer, Uniformity 3D printed a roll cage made from AlSi10Mg for a vehicle participating in the Bridgestone World Solar Challenge. Rather than more traditional carbon fiber, the car’s engineering team turned to metal 3D printing, optimizing the element’s topology to maximize strength while minimizing weight. 3D printed with a with a 30um layer thickness, the roll cage was able to achieve the same performance as a part with 60um layer thickness.

A 3D printed roll cage made with Uniformity Labs powder. Image courtesy of Uniformity Labs.

Additionally, the aluminum alloy, manufactured by Uniformity Labs, was less expensive than an alternative metal, such as titanium. For the powder making company, this was a case study in demonstrating the potential of AlSi10Mg for sustainable mobility as it was able to reduce weight and, therefore, improve the energy efficiency of the vehicle.

Metal parts 3D printed with Uniformity Labs’ powder. Image courtesy of Uniformity Labs.

Complete technical information about the material can be found below, based on an ASTM E8/E8-M rectangular tension test coupon:

  • 30um layer thickness
  • Ultimate Tensile Strength (Rm z) – 406 ± 14 MPa/ 251 ± 8 MPa
  • Ultimate Tensile Strength (Rm xy) – 438 ± 18 MPa/ 247 ± 9 MPa
  • Yield Strength (Rm z) 264 ± 8 MPa/148 ± 5
  • Yield Strength (Rm xy) 291 ± 12 MPa/156 ± 4
  • Fracture Elongation (Rm z) 3.7 ± 0.7%/14.2 ± 1.1%
  • Fracture Elongation (Rm xy) 7.2 ± 1.1%/17.3 ± 2.0%
  • Surface roughness in z direction (no treatment) (um) 3.4 ± 0.9

“This is an excellent example of how our innovation can significantly improve part design using our advanced powders and modern AM techniques,” said Adam Hopkins, founder and CEO of Uniformity Labs. “Our ultra-low porosity AlSi10Mg and print processes allowed the car development team to create a better part quickly, cheaply, and optimized for the necessary weight and safety parameters. It’s easy to see how the processes used, and benefits afforded to the roll-cage production can apply to the creation of complex parts for use in mainstream industries such as aviation, auto, and consumer electronics. That’s what our technology is all about.”

With a focus on 3D printing materials and software, Uniformity Labs raised nearly $40 million dollars in its series B funding round just this year. The company boasts uniquely dense properties for its metal powders, saying they “spontaneously attain high relative densities, approaching that of the densest crystalline particle packings, while retaining their ability to flow.” This, in turn, increases 3D printer throughput and the quality of the end parts.

These capabilities have raised some questions for 3DPrint.com Executive Editor Joris Peels, who suggests that the purported effects of the material seem “fantastical”, but notes that, if they really do deliver what they’re promising, it could be a game changer for the metal 3D printing industry.

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