Study of the elastic properties of porous copper fabricated via the lost carbonate sintering process

Jana, Prasanta; Ray, S. Saha; Goldar, Diya; Kota, Navya; Kar, Sujoy Kumar; Roy, Siddhartha

doi:10.1016/j.msea.2022.142713

Cited by 27 publications

(3 citation statements)

References 58 publications

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“…The designs marked * and * * are later used for the metal MD simulations presented in figure 12. With a porosity of the samples around ∼40%, and our estimated compressive Young's modulus of 21.5 GPa (figure 12(a)) and 27.8 GPa (figure 12(b)) for copper and 37.1 GPa (figure 12(c)) and 45.57 GPa (figure 12(d)) for nickel, we are in similar regimes as measured experimentally in recent work [25,26]. g), (h)), and resulting stress-strain deformation behavior and shear strain maps (for applied axial strains of 0., 0.056, 0.112, 0.169, 0.469 and 0.563).…”

Section: Resultssupporting

confidence: 87%

A computational building block approach towards multiscale architected materials analysis and design with application to hierarchical metal metamaterials

Buehler

2023

Modelling Simul. Mater. Sci. Eng.

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In this study we report a computational approach towards multiscale architected materials analysis and design. A particular challenge in modeling and simulation of materials, and especially the development of hierarchical design approaches, has been to identify ways by which complex multi-level material structures can be effectively modeled. One way to achieve this is to use coarse-graining approaches, where physical relationships can be effectively described with reduced dimensionality. In this paper we report an integrated deep neural network architecture that first learns coarse-grained representations of complex hierarchical microstructure data via a discrete variational autoencoder and then utilizes an attention-based diffusion model solve both forward and inverse problems, including a capacity to solve degenerate design problems. As an application, we demonstrate the method in the analysis and design of hierarchical highly porous metamaterials within the context of nonlinear stressstrain responses to compressive deformation. We validate the mechanical behavior and mechanisms of deformation using embedded-atom molecular dynamics simulations carried out for copper and nickel, showing good agreement with the design objectives.

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Section: Resultssupporting

confidence: 87%

A computational building block approach towards multiscale architected materials analysis and design with application to hierarchical metal metamaterials

Buehler

2023

Modelling Simul. Mater. Sci. Eng.

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“…For example, Shirjang et al [ 4 ] stated that the porosity of copper foams increased from 50.2 to 71.8%, and the plateau stress decreased from 83 ± 3.1 MPa to 20 ± 1.8 MPa, as the content of K 2 CO 3 used as the space holder increased from 50% to 70%. The porosity of the porous copper increased from 38.48 ± 0.91% to 66.47 ± 1.06%, and the yield strength decreased from 42.8 ± 4.6 MPa to 6.9 ± 0.9 MPa when the space holder of bimodal K 2 CO 3 : NaCl was 1:2, as their contents increased from 30% to 70%, according to Ray et al [ 5 ] The total porosity of porous copper increased from 27.5% to 67.1%, and the elastic modulus (C 11 ) decreased from 59.4 ± 0.2 GPa to 1.0 ± 0.2 GPa when the content of K 2 CO 3 used as the space holder increased from 0 to 54.4%, according to Jana et al [ 6 ]. Luo et al [ 7 ] showed that the elastic modulus of titanium foam decreased with the increasing size of the magnesium particles, while the porosity decreased, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Space Holder Shape on the Pore Structure and Mechanical Properties of Porous Cu with a Wide Porosity Range

Xiao,

He,

et al. 2024

Materials

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Porous copper (Cu), with varying porosities, has been made using carbamide as a space holder through the powder metallurgy route. Two shapes of carbamide particles were used, (i) needlelike and (ii) spherical, in order to investigate the effect of the space holder shape on the pore structure and mechanical properties of porous Cu. The compressive deformation behavior of porous Cu was studied under a compression test. The pores’ structural characteristics and mechanical properties of the porous Cu varied significantly with the shape of the space holder. Although the effect of the space holder shape on the porosity was not regular, the effect on the mechanical properties was regular. The stress increased monotonically with the increase in the strain, and strain hardening occurred at the plastic yield stage. The elastic modulus and yield strength followed the power law, with the relative density irrespective of the space holder shape. The empirical constants associated with different empirically developed power law relations were different, according to the shape of space holder. A quantitative relationship between the elastic modulus and yield strength and the spacer content was obtained to control the mechanical properties of the present porous Cu or other porous metals and metal foams using the well-known space holder method.

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“…Therefore, this paper attempts to solve this problem via the application of the MEM in the preparation of porous copper by using needlelike and spherical carbamide as a space holder with the volume content between 10 and 80%. This is based on the previous work in which we used needlelike carbamide as the space holder to produce porous copper at a volume fraction up to 90% [12] and several recent important papers on porous copper development via the PM route [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The application of the model equation method in the preparation of porous copper by using needlelike and spherical carbamide as a space holder

Jian

Yunhe

et al. 2023

Powder Metallurgy

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The measurement and predictive functions of the model equation method in the preparation of porous copper were studied. Needlelike and spherical carbamide was used as a space holder with volume content between 10 and 80%. One step of heat treatment for green compacts was applied to fabricate porous copper. A criterion for determining the uniformity of external dimensions of porous copper was proposed. The results showed that the mass follows the law of conservation and the height of porous copper decreased as the increase of spacer content while there was no regularity for the diameter. The porosity of porous copper calculated by the model equation method was equal to those of by the mass volume method. The theoretical formula obtained to describe the relationship between porosity and spacer content of porous copper intersects with the empirical formula. The results indicated that the measurement function of the model equation method was easier to play than the prediction function.

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Study of the elastic properties of porous copper fabricated via the lost carbonate sintering process

Cited by 27 publications

References 58 publications

A computational building block approach towards multiscale architected materials analysis and design with application to hierarchical metal metamaterials

A computational building block approach towards multiscale architected materials analysis and design with application to hierarchical metal metamaterials

Effects of the Space Holder Shape on the Pore Structure and Mechanical Properties of Porous Cu with a Wide Porosity Range

The application of the model equation method in the preparation of porous copper by using needlelike and spherical carbamide as a space holder

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