Towards an Ideal Energy Absorber: Relating Failure Mechanisms and Energy Absorption Metrics in Additively Manufactured AlSi10Mg Cellular Structures under Quasistatic Compression
Abstract
:1. Introduction
2. Design and Manufacturing
2.1. Rationale for Unit Cell Selection
2.2. Manufacturing
2.3. Compression Test Setup
3. Results
3.1. Effect of Unit Cell Shape
3.1.1. Hexagonal Honeycomb
3.1.2. Auxetic Lattice
3.1.3. Voronoi (Stochastic) Lattice
3.1.4. Schwarz-P TPMS
3.1.5. Diamond TPMS
3.1.6. Gyroid TPMS
3.2. Effect of Tube Enclosure
4. Discussion: Towards an Ideal Energy Absorber
4.1. Specific Energy Absorption and Transmitted Stress
4.2. Densification Efficiency
4.3. Plateau Undulation
4.4. Tunability
4.5. Evaluating Overall Energy Absorption Performance
5. Conclusions
- The 20 µm layer thickness laser powder bed fusion process on a 100 W laser machine generates lattices, honeycombs and TPMS cellular structures with high fidelity as evidenced by microscopy and the agreement between measured and nominally designed relative densities.
- A combination of four criteria may be used in determining the overall appropriateness of a cellular structure for implementation into energy absorbing system: (i) SEA vs. maximum transmitted stress; (ii) densification efficiency; (iii) plateau undulation; and (iv) tunability.
- Auxetic and Voronoi lattice structures perform poorly as energy absorbers primarily due to low SEA relative to maximum transmitted stresses, and low densification efficiencies. Lattices are however highly tunable.
- TPMS structures, in particular the diamond and gyroid shapes, show great promise as energy absorption materials, relative to honeycombs. This is primarily on account of their more gradual failure mechanism that includes folding and stacking of cell walls above each other, resulting in higher densification densities and lower plateau undulations.
- Enclosing cellular structures in tubes has the effect of increasing peak stress while also increasing plateau stress undulations.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Lattice Geometry | Process and Material | Relative Density Range (%) | Strain or Displacement Rates |
---|---|---|---|
BCC lattice [17] | PBF-LB Stainless Steel 316L | 3.5–13.8 | 0.25 mm/min |
Uniform and graded thickness BCC lattice [18] | PBF-LB AlSi10Mg | 22 (nominal) | 1.8 mm/min |
BCC and BCC-Z lattice | PBF-LB Stainless Steel 316L | 3.5–15.9 (nominal) | 0.5 mm/min |
Cubic, diamond and re-entrant lattice [19] | EBM Ti6Al4V | 13.7–16.6 | 0.2 mm/min |
Octet truss, rhombic dodecahedron, diamond and dode-medium lattices [20] | PBF-LB Inconel 718 | 15–30 (nominal) | 1 mm/min |
Pillar octahedral and octahedral lattices [21] | PBF-LB Stainless Steel 316L | 2.9–16.6 | 0.5 mm/min (elastic), 1 mm/min (plateau) |
Lattice geometry mimicking C15 Laves phase [22] | PBF-LB Al-12Si | 17–37 (nominal) | 0.002 s−1 |
Hollow micro-lattice [23,24] | Photopolymerization + Nickel coating | ~1.1–32 (nominal) | 1 mm/min |
TPMS double gyroid [25] | PBF-LB AlSi10Mg | 22 (nominal) | 0.54 mm/min |
TPMS diamond [26] | PBF-LB AlSi10Mg | 5–15 (nominal) | 0.4 mm/min |
TPMS diamond [27] | PBF-LB Cu-Cr-Zr copper alloy | 10–20 (nominal) | Quasi-static, rates not specified |
TPMS P-type and G-type [28] | PBF-LB Stainless Steel 316L | 22.5–36.7 | 0.001 s−1 |
TPMS P-type, diamond and gyroid [29] | PBF-LB Stainless Steel 316L | 10.4–31.4 | 0.001 s−1 |
Stacked origami sheet-based materials [30] | PBF-LB Stainless Steel 316L | 18.9–30.5 | 0.001 s−1 |
Bio-inspired cylindrical surface infilled with lattice struts [31] | PBF-LB AlSi10Mg | NA | 1 mm/min |
Unit Cell Shape | Thickness (mm) | Nominal Relative Density | Nominal Mass (g) | Measured Relative Density | Measured Mass (g) | % Difference |
---|---|---|---|---|---|---|
Honeycomb | 0.4 | 0.20 | 34.74 | 0.19 | 31.94 | −8.05 |
0.6 | 0.30 | 51.16 | 0.28 | 48.18 | −5.82 | |
0.8 | 0.39 | 66.84 | 0.36 | 63.18 | −5.48 | |
Auxetic | 0.5 | 0.08 | 40.54 | 0.08 | 44.85 | 10.62 |
0.75 | 0.18 | 61.73 | 0.17 | 68.39 | 10.79 | |
1 | 0.29 | 88.47 | 0.27 | 102.83 | 16.23 | |
Voronoi | 0.5 | 0.03 | 23.26 | 0.03 | 23.09 | −0.75 |
0.75 | 0.06 | 29.94 | 0.07 | 31.59 | 5.53 | |
1 | 0.09 | 38.47 | 0.12 | 42.21 | 9.71 | |
Diamond | 0.4 | 0.16 | 45.38 | 0.16 | 42.43 | −6.51 |
0.6 | 0.25 | 59.56 | 0.25 | 53.85 | −9.58 | |
0.8 | 0.33 | 73.48 | 0.32 | 67.74 | −7.81 | |
Schwarz P | 0.4 | 0.13 | 36.81 | 0.13 | 32.85 | −10.75 |
0.6 | 0.19 | 46.59 | 0.19 | 42.43 | −8.93 | |
0.8 | 0.26 | 56.42 | 0.25 | 49.89 | −11.57 | |
Gyroid | 0.4 | 0.11 | 39.28 | 0.11 | 34.85 | −11.29 |
0.6 | 0.17 | 50.35 | 0.17 | 45.67 | −9.30 | |
0.8 | 0.23 | 61.50 | 0.22 | 56.49 | −8.15 |
SEA vs. Max Transmitted Stress | Densification Efficiency | Plateau Undulation | Tunability | Overall | |
---|---|---|---|---|---|
Honeycomb | 2 | 1 | 1 | 2 | 2 |
Auxetic lattice | 3 | 3 | 3 | 1 | 3 |
Voronoi lattice | 3 | 2 | 1 | 1 | 3 |
Diamond TPMS | 1 | 1 | 1 | 2 | 1 |
Gyroid TPMS | 1 | 1 | 1 | 1 | 1 |
Schwarz-P TPMS | 1 | 1 | 2 | 2 | 2 |
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Shinde, M.; Ramirez-Chavez, I.E.; Anderson, D.; Fait, J.; Jarrett, M.; Bhate, D. Towards an Ideal Energy Absorber: Relating Failure Mechanisms and Energy Absorption Metrics in Additively Manufactured AlSi10Mg Cellular Structures under Quasistatic Compression. J. Manuf. Mater. Process. 2022, 6, 140. https://doi.org/10.3390/jmmp6060140
Shinde M, Ramirez-Chavez IE, Anderson D, Fait J, Jarrett M, Bhate D. Towards an Ideal Energy Absorber: Relating Failure Mechanisms and Energy Absorption Metrics in Additively Manufactured AlSi10Mg Cellular Structures under Quasistatic Compression. Journal of Manufacturing and Materials Processing. 2022; 6(6):140. https://doi.org/10.3390/jmmp6060140
Chicago/Turabian StyleShinde, Mandar, Irving E. Ramirez-Chavez, Daniel Anderson, Jason Fait, Mark Jarrett, and Dhruv Bhate. 2022. "Towards an Ideal Energy Absorber: Relating Failure Mechanisms and Energy Absorption Metrics in Additively Manufactured AlSi10Mg Cellular Structures under Quasistatic Compression" Journal of Manufacturing and Materials Processing 6, no. 6: 140. https://doi.org/10.3390/jmmp6060140