One of their most recent publications is Stresses occurring during one-sided die compaction of powders. Which was published in journal Powder Technology.

More information about S. Strijbos research including statistics on their citations can be found on their Copernicus Academic profile page.

S. Strijbos's Articles: (3)

Stresses occurring during one-sided die compaction of powders

AbstractDie compaction of powders is related to the principles of powder mechanics. Measurements are reported of boundary normal stresses occuring during one-sided die compaction of a fine ferric oxide powder. One series of experiments is carried out with carefully cleaned die walls, another series is performed with lubricated dies. The powder yield locus and wall yield loci are determined respectively with the help of a triaxial cell and a powder/wall friction apparatus. For both series of experiments the powder yield locus lies above the wall yield locus. The experimental data give support to the assumption that the stresses at the die wall obey the wall yield locus. With respect to the internal stresses of the powder, evidence is obtained that the powder yield criterion is not fulfilled, at least not necessarily.

Powder—wall friction: The effects of orientation of wall grooves and wall lubricants

AbstractThe friction between compacted ferric oxide powders and cemented tungsten carbide walls has been determined. The influence of the surface structure of the walls on powder—wall friction was studied by comparing the results obtained with polished, spark-eroded, and ground walls having grooves oriented perpendicular or parallel to the direction of sliding of the wall. Typical differences in powder—wall friction, appear to be present between ground walls with grooves oriented parallel to the direction of sliding and the other walls. The effect of wall lubrication was investigaed by covering walls with a thin film of stearic acid having a thickness in the range from 0.2 to 2.4 μm. Typical diferences are found between the cases where the coating thickness is larger and smaller than the mean particle size of the powder. In practice it follows that powder—wall friction can be reduced by grinding die walls in the axial direction and by the application of lubricant film thicknesses much larger than the particle size.

The paradox of uniformity and plurality in technological society

AbstractThe transition from traditional to modern technology has resulted in a dominant role for technology. Many believe this has caused a growing uniformity, a standardization, and cultural leveling in our societies. However, in the modern technological world there are also trends which point in the opposite direction. In this paper the connections between these two prominent characteristics of our times will be examined. While making a distinction between traditional and modern pluralism, it is argued that the contrasting phenomena of growing uniformity and growing plurality can be connected by the rise of modern technology. To reach a liberating perspective for our technological culture, we must break with its metaphysical backgrounds and the current view of modern man with his technological ambitions.

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