Initial Laboratory Tests on Compression Performance. Finding satisfactory caracteristics for continuous print.

In order to define a base piece to algorithmically optimize in subsequent designs, the following test tokens have been printed.

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C1 Token:

PLA Filament at 0.6mm thickness. For finding appropiate scale and thickness test.

Download Gcode – STL – Rhino File

 

• Characteristics

  		POR CÁLCULO			CON BALANZA
  CLASS	TOKEN	Density (g/cm3)			Weight P(g)
  		PẌ	VẌ	DẌ	PẌ
  C	C1	143.0	2501.6	0.057	143.0

  CON CALIBRE				CON CALIBRE
  Diameter Ø (mm)				Height c (mm)
  Ø1	Ø2	Ø3	aẌ	c1	c2	c3	eẌ
  159.5	159.6	159.4	159.5	125.6	125.0	125.0	125.2

• First medium scale print. The piece has taken 6h to print.

• 0.6 mm Thickness shows the optimum layer that maintains full continuity. TPMS have the particularity of having 0 mean curvature at every point, as in saddle shapes, this contiuity if exploited by the layer by layer extrusion fabrication, for having the lightest optimum distribution of tensions with the least amount of material.

• The cilindrical piece shows absolute singularity in its perimeter, handling better edge cases and showing overall a more continuos general form. The cilindrical piece also loses its property of assemblability as singular discontinuities arise another challenge of recovering continuity of discrete pieces for large scale architectural component application.

 

Video of compression Test

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T1-T5 Tokens:

Tenax Filament at 1mm thickness with variances in height for filament and size performance.

Download Gyroid + P Schwartz Gcode – Gyroid STL – PSchwartz STL

• Characteristics:

  		POR CÁLCULO			CON BALANZA
  CLASS	TOKEN	Density (g/cm3)			Weight  P(g)
  		PẌ	VẌ	DẌ	PẌ
  T	T1	29.0	165.7	0.175	65.0
  	T2	18.0	140.9	0.128	53.0
  	T3	20.0	117.6	0.170	45.9
  	T4	20.0	119.9	0.167	46.7
  	T5	18.0	109.7	0.164	42.6
  	T6	12.0	196.1	0.061	69.4
  	T7	8.0	188.5	0.042	65.5

  		CON CALIBRE
  CLASS	TOKEN	Side a (mm)	Side b (mm)	Height c (mm)
  		aẌ	bẌ	cẌ
  T	T1	61.1	61.5	44.1
  	T2	60.6	61.2	38.0
  	T3	60.5	61.5	31.6
  	T4	60.9	61.5	32.0
  	T5	60.6	61.8	29.3
  	T6	60.2	60.2	54.1
  	T7	60.2	60.8	51.5

• The Period of 6pi, which produces in a gyroid ondulation of 6 unique curvatures by layer will be set as standard for tests as handles 3 complete transformations of geometry, important for comparison with optimized models.

• By having a smaller span, the 6cm x 6cm base is better suited to handle deformations by compression, reducing the camel back deformation sequence, which produces better applications for architectural components.

• Smaller tokens of 6cm3 are chosen for next set of tests. These pieces take notably less time to print, within 1 – 2 hours of print time.

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T6-T7 Tokens:

Tenax Filament at 0.5mm thickness with Gyroid and P Schwartz geometry performance.

Download Gcode – Gyroid STL – PSchawrtz STL

 

 

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• 0.4 Thickness results in unacceptable continuity and unrelaiable results, for which 0.6 thickness will be executed on next tests.

• Gyroid geometry performs notably better so far, but tokens of relaiable quality must be analized before proceeding.

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General comments on tests:

• 0.6mm of Thickness is the minimum result for the scales and curavture being studied, any wall thickness less than 0.6mm produces unacceptable quality.

• 6 cm3 volume of piece is fixed as test standard in order to compare base cases with optimized cases, this volume gives just enough properties for testing algorithmic variability (center – perimter differenctiation) while having an acceptable “camel back” collapse deformation performance.

• PLA performs within an acceptable resistance frame. Being easier to produce because of it’s thermoplastic properties (fusion temperature particularly) is chosen for next token production.

• Tenax performs considerably better, future material testing may be required if no large scale architectural is achieved with more standard materials

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Download Full dimension / weight / density tables