scholarly journals Final Report: Hyperfine Experimental Investigations of Point Defects and Microscopic Structure in Group in Oxide Ceramics, August 1, 1997 - July 31, 1998

1998 ◽  
Author(s):  
John A. Gardner
Keyword(s):  
Point Defects ◽  
Experimental Investigations ◽  
Final Report ◽  
Microscopic Structure ◽  
Oxide Ceramics

A Model to Explain the Variations of “End-of-Range” Defect Densities with Ion Implantation Parameters

1992 ◽  
Vol 279 ◽  
Author(s):  
L. Laanab ◽  
C. Bergaud ◽  
M. M. Faye ◽  
J. Faure ◽  
A. Martinez ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Computer Simulations ◽  
Point Defects ◽  
Numerical Optimization ◽  
Experimental Investigations ◽  
Shallow Junctions ◽  
Quantitative Explanation ◽  
Defect Densities

ABSTRACTComputer simulations in conjunction with TEM experiments have been used to test the different models usually adopted in the literature to explain the formation of “End Of Range”(EOR) defects which appear after annealing of preamorphized silicon layers. Only one survives careful experimental investigations involving Si+, Ge+, Sn+ amorphization at RT and LNT. The “excess-interstitial” model appears relevant at least for a semi-quantitative explanation of the source of point-defects which after recombination and agglomeration, lead to the formation of these defects. This model may be used for the numerical optimization of conditions for the production of high performances ullra-shallow junctions.

Structure and Crystallographic Texture of Arthropod Bio-Composites

2005 ◽  
Vol 495-497 ◽  
pp. 1665-1674 ◽  
Author(s):  
Dierk Raabe ◽  
A. Al-Sawalmih ◽  
P. Romano ◽  
C. Sachs ◽  
Heinz Günter Brokmeier ◽  
...  
Keyword(s):  
Crystallographic Texture ◽  
Horseshoe Crab ◽  
Organic Matrix ◽  
Experimental Investigations ◽  
Microscopic Structure ◽  
Decapod Crustaceans ◽  
Cell Axis ◽  
Nano Composite ◽  
Axis Parallel ◽  
Similar Crystallographic Orientation

In this study we present experimental investigations on the microscopic structure, constituent phases, and crystallographic textures of the exoskeleton of three types of decapod crustaceans, namely, lobster, crab, and horseshoe crab. The carapace of such animals is a biological multiphase nano-composite consisting of an organic matrix (crystalline chitin and non-crystalline proteins) and biominerals (calcite, phosphate). The synchrotron measurements of the crystalline chitin and of the biominerals which are embedded in the chitin-protein matrix (in case of lobster and crab) reveal strong textures. The horseshoe crab does not seem to contain notable amounts of crystalline minerals. The Debye-Scherrer images of the lobster specimen suggest that the biominerals form clusters of crystals with similar crystallographic orientation. TEM images support this suggestion. The crystallographic texture of the chitin is arranged with its longest cell axis parallel to the normal of the surface of the exoskeleton.

Torsionsfestigkeit von umformgefügten Zahnrädern*/Torsional Strength of Multi-Component Gears – static and dynamic torsional strength of gears manufactured by lateral extrusion

2019 ◽  
Vol 109 (10) ◽  
pp. 701-708
Author(s):  
R. Meißner ◽  
M. Liewald ◽  
C. Leonhardt ◽  
M. Otto ◽  
K. Stahl
Keyword(s):  
Cold Forging ◽  
Experimental Investigations ◽  
Final Report ◽  
Torsional Strength ◽  
Joining By Forming ◽  
Torsional Load ◽  
Lateral Extrusion ◽  
Component Design ◽  
Gear Ring ◽  
The One

Im Rahmen des Verbundprojekts „massiverLeichtbau“ (AiF-KZ47M4712) wurde als Beitrag zur Gewichtsreduktion von Antriebsstrangkomponenten am Institut für Umformtechnik (IFU) in Stuttgart und an der Forschungsstelle für Zahnräder und Getriebebau (FZG) in München das Verfahrenskonzept zur umformtechnischen Herstellung von „gebauten“ Zahnrädern mittels Querfließpressen in Mehrkomponentenbauweise entwickelt und dessen Leichtbaupotenzial untersucht. Dieses Verfahren erlaubt das form- und/oder reibschlüssige Fügen von Zahnkranz, Zahnradkörper und Welle und erlaubt so eine kompakte, gewichtsoptimierte Bauweise solcher Zahnräder. Zur Quantifizierung des Anwendungspotenzials von gebauten Zahnrädern mittels Umformfügen wurden die Einflüsse des Werkstoffs, des Umformschmierstoffs und der Zahnkranzinnengeometrie auf das übertragbare Drehmoment gezeigt. Das Ziel der experimentellen Untersuchungen lag einerseits in der Ermittlung der Versagensart unter Torsionslast und schließlich in der Bestimmung einer optimalen Kombination aus Werkstoff, Umformschmierstoff und Zahnkranzinnenprofil zur Übertragung möglichst hoher Drehmomente. Die hier dargestellten Ergebnisse sowie einzelne Textpassagen stammen aus dem AiF-Abschlussbericht sowie einer vorangehenden Veröffentlichung [12].   In order to reduce the weight of powertrain components, the manufacturing process concept for joining by forming of „built“ gears using lateral extrusion in multi-component design is being developed and the lightweight potential is being investigated. This paper deals with the manufacturing of an assembled gearwheel using cold forging and simultaneously joining the gearwheel body with a gear ring. The aim of this publication is to demonstrate the influence of the material, the lubricant and the geometry of the inner gear ring on the transmittable torsional load based on built gears manufactured by joining by forming. The aim of the experimental investigations was on the one hand to determine the type of failure under torsional load and finally to determine an optimal configuration of material, lubricant and internal gear ring profile for the transmission of preferably high torques. The here presented results and individual text passages originate from the AiF final report [14] and a prior publication [12].

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