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Electrical contacts in automotive applications are exposed to thermal and vibration induced relative motion in the tribological contact. Fretting tests with an AuCo/Ni vs. Au/NiP ball to plate contact were conducted in order to describe the ongoing wear mechanisms. Furthermore, a global wear approach was chosen to quantify the overall wear. According to a predefined electrical failure criterion the connector lifetime is demonstrated in a model depending on oscillating amplitude, gold thickness and contact roughness. The electrical failure of the contact can be reduced to the wear of the gold platings leading to exposure of the nickel interlayer and consequently oxidation. Through material transfer, plowing, particle generation and the particle transport mechanisms the contact resistance increases and therefore limits the connector lifetime. The link between the lifetime models and the global wear approach allows for calculation of the lifetime when only the wear and the stress of the tribosystem are known.

gold --- Schwingverschleiß --- Gold --- elektrischer Steckkontakte --- Tribologie --- fretting --- electrical contacts --- tribology

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MEMS and Nanotechnology, Volume 6: Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics, the sixth volume of seven from the Conference, brings together 23 contributions to this important area of research and engineering.  The collection presents early findings and case studies on fundamental and applied aspects of Experimental and Applied Mechanics, including papers on:  Devices & Fabrication Measurement Challenges in Single Molecule/Single Atom Mechanical Testing Nanoindentation Size Effects in Metals Optical Methods Reliability, Residual Stress & Tribology.

Classical mechanics. Field theory --- Chemical structure --- Electrical engineering --- Applied physical engineering --- Biotechnology --- tribologie --- nanotechniek --- toegepaste mechanica --- biotechnologie --- ingenieurswetenschappen --- mechanica

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Dental Biotribology summarizes the latest achievements in dental wear and is designed to help the reader better understand the relationship between structures and tribological properties of human teeth. This book provides guidance on the biomimic design of anti-wear engineering systems based on human teeth and also explains mechanisms of occlusal wear and erosion as well as fretting wear related to dental implants and orthodontics. Additionally, this book provides valuable insights into the development of improved dental materials and oral treatments. This book also: Explains the relationship between structures and tribological properties of human teeth Provides guidance on the biomimic design of anti-wear engineering systems based on human teeth Explains mechanisms of occlusal wear and erosion as well as fretting wear related to dental implants and orthodontics Provides valuable insights into the development of improved dental materials and oral treatments Dental Biotribology is an ideal book for researchers interested in tribology and oral rehabilitation.    .

Inorganic chemistry --- Human biochemistry --- Stomatology --- Applied physical engineering --- Engineering sciences. Technology --- tribologie --- medische biochemie --- biochemie --- stomatologie --- anorganische chemie --- ingenieurswetenschappen --- corrosie --- Dentistry. --- Orthodontics.

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This book provides essential information on metal forming, utilizing a practical distinction between bulk and sheet metal forming. In the field of bulk forming, it examines processes of cold, warm and hot bulk forming, as well as rolling and a new addition, the process of thixoforming. As for the field of sheet metal working, on the one hand it deals with sheet metal forming processes (deep drawing, flange forming, stretch drawing, metal spinning and bending). In terms of special processes, the chapters on internal high-pressure forming and high rate forming have been revised and refined. On the other, the book elucidates and presents the state of the art in sheet metal separation processes (shearing and fineblanking). Furthermore, joining by forming has been added to the new edition as a new chapter describing mechanical methods for joining sheet metals. The new chapter “Basic Principles” addresses both sheet metal and bulk forming, in addition to metal physics, plastomechanics and computational basics; these points are complemented by the newly added topics of metallography and analysis, materials and processes for testing, and tribology and lubrication techniques. The chapters are supplemented by an in-depth description of modern numeric methods such as the finite element method. All chapters have been updated and revised for the new edition, and many practical examples from modern manufacturing processes have been added. Fritz Klocke, born on October 10th, 1950 in Vlotho, Germany. 1968 apprenticeship examination as a toolmaker. 1970-1973 production engineering studies at Lemgo/Lippe Polytechnic. 1973-1976 production engineering studies at Technical University Berlin. 1977-1981 research assistant, 1981-1984 chief engineer at the Institute for Machine Tools and Production Engineering, Technical University Berlin. 1982 doctorate in engineering. 1984-1994 employed at Ernst Winter & Sohn GmbH & Co., Hamburg. January 1st, 1995 director of the Department of Manufacturing Technology at the RWTH Aachen’s Laboratory for Machine Tools and Production Engineering (WZL) and director of the Fraunhofer Institute of Production Technology (FhG-IPT), Aachen.

Physics --- Surface chemistry --- Materials sciences --- Materials processing --- Machine elements --- Applied physical engineering --- Engineering sciences. Technology --- Plant and equipment --- Production management --- tribologie --- materiaalkennis --- oppervlakte-onderzoek --- productie --- machines --- ingenieurswetenschappen --- productieprocessen

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This book gives an introduction to the mechanical behavior and degradation of dental ceramics and guides the reader through their performance under effect of oral environments. It addresses the different kinds of dental ceramics, their properties, degradation and mechanical aspects with less emphasys on the physics and chemistry involved, which makes the reading interesting for beginners in the field. In each chapter, the reader will learn about the mechanical behavior of dental ceramics and each phenomenon involved in their application, besides finding some practical examples of their use in dental clinics, their manufacturing procedures and types of degradation. The clear language and the application-oriented perspective of the book makes it suitable for both professionals and students who want to learn about dental ceramics.

Inorganic chemistry --- General biophysics --- Stomatology --- Materials sciences --- Engineering sciences. Technology --- Chemical technology --- composieten --- tribologie --- biologische materialen --- materiaalkennis --- stomatologie --- anorganische chemie --- chemische technologie --- corrosie --- Dental ceramics. --- Nanostructured materials. --- Dentistry.