Generation and analysis of 3D anisotropic meso-structured materials
| Autor: | Kazuaki Yazawa, Eric A. Nauman, Ninad Trifale |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science business.industry Thermal resistance Stiffness 02 engineering and technology Structural engineering Conductivity Thermal energy storage 020303 mechanical engineering & transports 020901 industrial engineering & automation Thermal conductivity 0203 mechanical engineering medicine medicine.symptom Composite material Elasticity (economics) business Anisotropy Elastic modulus |
| Zdroj: | 2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). |
| DOI: | 10.1109/itherm.2016.7517649 |
| Popis: | A methodology for a systematic generation (synthesis) of highly anisotropic micro-lattice structures is investigated. Numerical modelling techniques were used to validate the models that were developed. The analysis was targeted at developing potential thermal interfaces and passive heat storage devices with the objective of specifically tuning particular thermal and mechanical characteristics. Set of all possible permutations of structures for an 8-node cubic unit cell were considered and the degree of anisotropy of meta-properties in heat transport and mechanical elasticity were evaluated. Feasibility checks were performed to ensure that the generated unit cell network was repeatable and a continuous lattice structure. The maximum allowable connections or struts was limited to four due to computational limitations. A self-consistent mechanical elasticity model was developed which connected the meso-scale properties to stiffness of individual struts. A three dimensional thermal resistance network analogy was used to evaluate the effective thermal conductivity of the structures. The struts were modelled as a network of one dimensional thermal resistive elements and effective conductivity evaluated. An objective function was defined for generated structure in order to evaluate and maximize anisotropy while simultaneously have a combination of the low effective stiffness and high effective thermal conductivity o. A trade-off between the stiffness and thermal conductivity was observed. The maximum anisotropic indices for effective thermal conductivity and elastic modulus were found to be 8.1 and of 4.2, respectively, for a maximum of 4-strut network. A “Proof-of-concept” sample scaled 2.5x was successfully fabricated with the currently available 3D printing technology. |
| Databáze: | OpenAIRE |
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