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Design for Metrology in Additive Manufacturing

Designing for AM, in general, has its challenges. One challenge is ensuring that your designs will be measurable using X-ray Computed Tomography (XCT). Below, I briefly go over this and invite you to watch my presentation diving deeper into the subject.

Younes Chahid
August 12, 2020 • 3 min read

With the rise of design for additive manufacturing (DfAM) awareness, more efficient and functional designs are being made taking advantage of additive manufacturing (AM) complexity. However, at the same time, since these designs are usually complex enough to not be manufactured using conventional manufacturing methods, they are also complex enough to not be measurable using conventional metrology tools.

 

Figure 1: Additive manufactured steel joints designed by Arup. All designed to carry the same load [1].

 

To tackle this challenge, a non-conventional metrology tool is usually used, X-ray Computed Tomography (XCT). While XCT still lacks standardisation and needs more research to better generate uncertainty statements, it is becoming more and more popular in the AM field.

 

Figure 2: Design in nTop (left), additive manufacturing in aluminium (middle), XCT and wall thickness analysis using VGStudio.

 

In my webinar available on-demand Tuesday, August 18, there will be a general introduction to metrology, where XCT fits in the scope of measurement tools, and finally, ways to design for metrology. In this case, design for metrology will mean taking in consideration XCT measurement limitations during the design phase, making sure that your important function related features are measurable using XCT.

References

 [1] Mercuri, Valentina. (2018). Form and structural optimization: from beam modeling to 3D printing of reinforced concrete members.

Written by
Younes Chahid has a first class Mechanical Engineering degree and is currently a 2nd year PhD researcher on the topic of Design and Metrology of AM Lattice and Trabecular Structures at the University of Huddersfield. Younes is also the founder and mentor of the award-winning University of Huddersfield 3D Printing Society. His experiences are in generative design, design for AM using topology optimization and lattice structures and metrology using X-ray CT for dimensional, surface roughness and porosity analysis. Younes has been selected in iMeche 2019 Rising Stars list and is also the winner of the international Additive World Design for AM 2020 challenge.

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