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Wyszukujesz frazę "Buhl, S." wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Simulation of single grain cutting using SPH method
Autorzy:
Ruttimann, N.
Buhl, S.
Wegener, K.
Powiązania:
https://bibliotekanauki.pl/articles/100039.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
single grain cutting
engineered grinding tools
smooth particle hydrodynamics
Opis:
So-called Engineered Grinding Tools (EGT) have been developed in order to satisfy the industry's demand for more efficient and cost-effective grinding tools, which differ from classic grinding tools by placing and brazing single abrasive grains in a predefined pattern onto the grinding tool body. Single grain cutting simulations form an important part towards an advanced understanding of the engineered grinding process. Cutting simulations with FE Methods encounter problems arising from large deformation and material separation. These can be overcome using meshless methods. In this work, a Smooth Particle Hydrodynamics (SPH) Method is used to model the single diamond grain cutting, which can be used as the basis process for physical simulation of the grinding process. As results the influence of the grain geometry, grain orientation and grain placement on the cutting forces, the burr generation and the chip removal rate are presented. It is shown that the cutting forces for a given grain geometry as well as the burr generation are heavily influenced by the orientation of the minor and the main cutting faces. Also cutting in material being work hardened by preceding grains, is simulated in order to be able to synthesize the grinding process from single grain cutting.
Źródło:
Journal of Machine Engineering; 2010, 10, 3; 17-29
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The meteorite fall near Boumdeid, Mauritania, from September 14, 2011
Autorzy:
Buhl, S.
Toueirjenne, C.
Hofmann, B.
Laubenstein, M.
Wimmer, K.
Powiązania:
https://bibliotekanauki.pl/articles/411504.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Boumdeid (2011)
meteorite fall
Mauritania
trajectory scenario
L6 chondrite
cosmogenic radionuclides
Opis:
On the evening of September 14, 2011 at 21:00 GMT a bright bolide was observed by hundreds of eyewitnesses in the area north and west of the town of Kiffa, in the department of Assaba, in south Mauritania. A terminal fragmentation and sound phenomena were observed near the end point of the trajectory. At least one mass of 3.5 kg was observed to impact and recovered the morning after the fall near Boumdeid (or Bou Mdeid), around 60 km north of Kiffa. Subsequently a large number of eyewitness accounts were recorded and mapped by GPS. The present paper provides a scenario for the trajectory of the Boumdeid (2011) meteorite based on the available parameters and wind data at the relevant altitudes. In addition the paper presents the results of the mineralogical and chemical analysis of the recovered meteorite which is consistent with a classification as ordinary chondrite of type L6, shock stage S2, and a weathering grade of W0. Following its analysis and classification, the meteorite was published under the official name Boumdeid (2011) in Meteoritical Bulletin, no. 100, MAPS 49(8), (2014). Gamma ray spectroscopy was conducted 84 days after the fall and the detection of short-lived radionuclides such as 56Co and 46Sc confirmed the recency of the event. Derived from the data of 60Co, 54Mn and 22Na the approximate preatmospheric radius of the meteorite body was 10–20cm. The report is also intended to serve as a case example for post-event data recovery and trajectory reconstruction in areas not covered by sky-camera networks and with limited scientific infrastructure.
Źródło:
Meteorites; 2014, 3, No. 1-2; 5-18
2299-0313
2299-1220
Pojawia się w:
Meteorites
Dostawca treści:
Biblioteka Nauki
Artykuł
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