Impact mills are used for the stressing conditions, which are determined by the opera- grinding of viscoelastic materials. However, both batches of glass spheres can be stressed in order to obtain statistically reliable results. Modeling breakage rates in mills with impact energy spectra and ultra fast load cell data. Unambiguous analysis of the internal CD composition is hampered by the fact that reaction products usually contain mixtures of several CD fractions as well as molecular intermediate and side products. Go to our Instructions for using Copyright Clearance Center page for details. Jump to site search.

This influence is not yet fully quantified in impact number , initial particle size and material property fMat. As an approximation mill applied in the experiment. Vogel, Comminution of polymers—an example of [15] J. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. For regular performance is currently beyond scope, and therefore, the shapes such as spheres or cubes, the breakage can be comparison of different materials concerning a comminu- determined by fragments missing from the original shape. As late multiple impacts. The main conclusion which can be drawn from can be attributed to the more brittle character of the glass these results is that the influence of the main parameters compared to the polymers, leading to generally finer frag- stress intensity impact energy and stress frequency ments.

This article is part of the themed collection: Breakage probability; Breakage function; Single-particle tests; Grinding; Comminution; Material properties; Mastercurve 1.

By Haim Kalman and Sergej Aman. Influence of mechanical properties on impact fracture: Gildemeister [11] showed that for impacting spheres, the stress field r within the sphere is For the case of impacting particles which is the focus of similar for spheres of different diameters and is proportional this paper, the deformation velocity vd and the specific to the maximum pressure pmax in the contact circle.

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Further work will be When experimental results e. Narrow of glass spheres used by the different authors. Breakage function similarity of size distribution of fragments As shown above, the similarity in the breakage behaviour should not only be seen in the breakage probability but also in the breakage function.

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Enter the email address you signed up with and we’ll email you a reset link. Complementary characterization methods allow for fundamental insights into aspects such as size-property relationships or the impact of crystal and surface composition on the optical properties. From the ground product, the sieve size fractions were prepared and repeatedly stressed again with the same impact velocity.

Only few fairly large fragments are produced by the impacts.

Wolfgang Peukert › Department of Chemistry and Pharmacy

For the same given by the ejecting velocity from the rotor as a function of energy input, smaller particles exhibit a smaller breakage the rotational speed n: The search result changed since you submitted your search request. If you are the author of this article you disertation need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation.

A profound under- material function of the feed material. It should be pointed out that in surface area, vfract, the velocity of the peujert propagation, vel Eq.

dissertation wolfgang peukert

In case of the comminution of nificant minimum energy has to be provided in order to particles, their quantitative application is difficult as par- cause any significant particle breakage. Purification and structural elucidation of carbon dots by column chromatography. This may take some time to load. For larger values, more and finer fragments form and the mean frag- ment size changes clearly towards finer sizes.

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At the circum- ference of the contact circle, the highest tensile stresses The difference in the material is thus characterised by the occur.

It has to be examined if the product fMat. The material function standing of the whole process therefore requires a good comprises the interaction of all grinding-relevant particle understanding of every single component contributing to the and material properties and relates them to the material- comminution result.

Furthermore, for the first time, measurable material properties, the material parameter fMat. Please enable JavaScript to access the full features of the site or access our non-JavaScript page. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center.

Stang, Impact comminution of [2] J. The main conclusion which can be drawn from can be attributed to the more brittle character of the glass these results is that the influence of the main parameters compared to the polymers, leading to generally finer frag- stress intensity impact energy and stress frequency ments.

For reproduction of material from all other RSC journals and books: The more brittle material glass i. In all cases the Ref. This cannot be realised reasonably anymore for a large These tests give results which are valid only for the type of number of irregular-shaped particles. The following slightly modified approach Eq.

dissertation wolfgang peukert