| 1. |
- Andersson, Anders G., et al.
(författare)
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Flow through a two-scale porosity material
- 2009
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Ingår i: Research Letters in Materials Science. - : Hindawi Limited. - 1687-6822 .- 1687-6830.
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Flow through a two-scale porous medium is here investigated by a unique comparison between simulations performed with computational fluid dynamics and the boundary element method with microparticle image velocimetry in model geometries.
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| 2. |
- Dham, A., et al.
(författare)
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The Determination of Bound Water in Waste Phosphatic Clay
- 2009
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Ingår i: Research Letters in Materials Science. - : Hindawi Limited. - 1687-6822 .- 1687-6830.
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Tidskriftsartikel (refereegranskat)abstract
- Phosphatic clay is a by-product of phosphate strip mining, particularly in Florida, USA. This waste material occupies about 100000 acres of land which could be utilized for other causes. Thus, its use as an alternating cementing material for the addition into the mixing matrix of cement paste and concrete to yield higher strength would be profitable for both materials involved. But the biggest drawback faced is that the phosphatic claypossesses high water holding capacity. The water is thus not available for mixing purposes when added to cement paste and concrete and is thus known as bound water. It is therefore essential to determine the amount of bound water to phosphatic clay which shall not be available for the hydration reaction of cement in cement paste and concrete.
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| 3. |
- Korojy, Bahman, et al.
(författare)
-
Microsegregation and Solidification Shrinkage of Copper-Lead Base Alloys
- 2009
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Ingår i: Advances in Materials Science and Engineering. - : Hindawi Publishing Corporation. - 1687-6822 .- 1687-8434 .- 1687-8442.
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Tidskriftsartikel (refereegranskat)abstract
- Microsegregation and solidification shrinkage were studied on copper-lead base alloys. A series of solidification experiments was performed, using differential thermal analysis (DTA) to evaluate the solidification process. The chemical compositions of the different phases were measured via energy dispersive X-ray spectroscopy (EDS) for the Cu-Sn-Pb and the Cu-Sn-Zn-Pb systems. The results were compared with the calculated data according to Scheil's equation. The volume change during solidification was measured for the Cu-Pb and the Cu-Sn-Pb systems using a dilatometer that was developed to investigate the melting and solidification processes. A shrinkage model was used to explain the volume change during solidification. The theoretical model agreed reasonably well with the experimental results. The deviation appears to depend on the formation of lattice defects during the solidification process and consequently on the condensation of those defects at the end of the solidification process. The formation of lattice defects was supported by quenching experiments, giving a larger fraction of solid than expected from the equilibrium calculation.
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| 4. |
- Sadeghi, Mohammad, et al.
(författare)
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Experimental and Theoretical Studies on the Effect of Die Temperature on the Quality of the Products in High-Pressure Die-Casting Process
- 2012
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Ingår i: Advances in Materials Science and Engineering. - : Hindawi Limited. - 1687-6822 .- 1687-8434 .- 1687-8442. ; :434605
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Tidskriftsartikel (refereegranskat)abstract
- Die temperature in high-pressure die casting of A380 alloy is optimized by experimental observation and numerical simulation. Ladder frame (one part of the new motor EF7) with a very complicated geometry was chosen as an experimental sample. Die temperature and melt temperature were examined to produce a sound part. Die temperatures at the initial step and the final filling positions were measured and the difference between these values was calculated. ProCAST software was used to simulate the fluid flow and solidification step of the part, and the results were verified by experimental measurements. It is shown that the proper die temperature for this alloy is above 200 degrees C.
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