About this Abstract |
Meeting |
5th International Congress on 3D Materials Science (3DMS 2021)
|
Symposium
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5th International Congress on 3D Materials Science (3DMS 2021)
|
Presentation Title |
Investigation of Microstructural Evolution during Compression of Ni Foam Using Micro-CT and FEM |
Author(s) |
Jaehyung Cho, Jun-Ho Lee, Geon Young Lee, Jong-Joo Rha |
On-Site Speaker (Planned) |
Jaehyung Cho |
Abstract Scope |
Metal foams have been widely used in many applications ranging from weight-saving structures and heat exchange to functional applications, due to low density, high ratio of weight to strength, and large surface area. In this study, mechanical responses and microstructural evolution of porous Ni with approximately 92% porosity are investigated using micro-CT and finite element method. During uni-axial compression, flow curves consist of linear elastic, quasi-plateau and densification stages. Using micro-CT, three-dimensional model was reconstructed and was used for FE modeling of compression. Stress relaxation observed near transition between linear elastic and quasi-plateau stages was associated with buckling of narrow ligament structures. Thick ligaments revealed high stress distribution and few buckling. Similar pore distribution but thicker ligament resulted in decrease in porosity and little stress relaxation. With increase in porosity, energy absorption decreased but ideal efficiency of energy absorption increased. The stress relaxation somewhat improved ideal efficiency of energy absorption. |
Proceedings Inclusion? |
Definite: Other |