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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
An investigation of two-body abrasive wear utilizing a pin specimen on a rotating SiC particle abrasive paper test device is described. The test materials were 7075 aluminum and 4340 steel which were thermally treated to attain a range of hardness, fracture toughness and yield strength values. Wear resistance is seen to correlate directly with hardness and yield strength for both materials. For the 4340 steel the wear resistance is inversely proportional to the fracture toughness; for the 7075 aluminum, the inverse proportionality is dependent upon the microstructure. The effect of an increase in hardness by heat treatment of an alloy is much less pronounced than when the wear resistance of pure metals of differing hardness is compared. Scanning electron microscopy of abraded surfaces was used to examine the removal mechanisms involved in abrasive wear. The meaning of the observed mechanisms in terms of a model are assessed.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
An investigation of two-body abrasive wear utilizing a pin specimen on a rotating SiC particle abrasive paper test device is described. The test materials were 7075 aluminum and 4340 steel which were thermally treated to attain a range of hardness, fracture toughness and yield strength values. Wear resistance is seen to correlate directly with hardness and yield strength for both materials. For the 4340 steel the wear resistance is inversely proportional to the fracture toughness; for the 7075 aluminum, the inverse proportionality is dependent upon the microstructure. The effect of an increase in hardness by heat treatment of an alloy is much less pronounced than when the wear resistance of pure metals of differing hardness is compared. Scanning electron microscopy of abraded surfaces was used to examine the removal mechanisms involved in abrasive wear. The meaning of the observed mechanisms in terms of a model are assessed.
Author: Ioan D. Marinescu Publisher: William Andrew ISBN: 1437734677 Category : Technology & Engineering Languages : en Pages : 602
Book Description
This book draws upon the science of tribology to understand, predict and improve abrasive machining processes. Pulling together information on how abrasives work, the authors, who are renowned experts in abrasive technology, demonstrate how tribology can be applied as a tool to improve abrasive machining processes. Each of the main elements of the abrasive machining system are looked at, and the tribological factors that control the efficiency and quality of the processes are described. Since grinding is by far the most commonly employed abrasive machining process, it is dealt with in particular detail. Solutions are posed to many of the most commonly experienced industrial problems, such as poor accuracy, poor surface quality, rapid wheel wear, vibrations, work-piece burn and high process costs. This practical approach makes this book an essential tool for practicing engineers. Uses the science of tribology to improve understanding and of abrasive machining processes in order to increase performance, productivity and surface quality of final products A comprehensive reference on how abrasives work, covering kinematics, heat transfer, thermal stresses, molecular dynamics, fluids and the tribology of lubricants Authoritative and ground-breaking in its first edition, the 2nd edition includes 30% new and updated material, including new topics such as CMP (Chemical Mechanical Polishing) and precision machining for micro-and nano-scale applications
Author: Sanjeev Anand Torvi Publisher: ISBN: Category : Languages : en Pages : 144
Book Description
Two-body abrasion is a type of wear mechanism, in which the surfaces of two bodies with same or different geometries interact by sliding against each other. This sliding leads to the formation of a groove which may include material removal. Two-body abrasion also leads to generation of frictional heating along with plastic deformation. Frictional heating and material loss due to abrasive wear considerations are vital for applications such as farming equipment, automotive braking systems, hard drives, electrical switches and more. Although considerable amount of work has been carried out previously to study two-body abrasion, the majority of the studies [1-3] were purely mechanical and did not include thermal effects. In this work, a fully coupled thermo-mechanical analysis of two-body abrasion is carried out using the finite element software package ABAQUS. Numerical simulation of wear is performed by considering a three-dimensional (3-D) model of a rigid sphere indenting and sliding against an elastic-plastic rectangular work piece made of AISI 1045 steel. Johnson-Cook material model [4] is used to incorporate the effects of temperature and strain rate. Arbitrary Lagrangian Eulerian (ALE) adaptive meshing is used for reducing excessive mesh distortion and thereby improving the accuracy of the results. The results of the finite element model developed are validated with those obtained by Abdelali et al. [5]. Following this, numerical simulations are executed for primarily two cases. The first case includes the effect of temperature on the field variables whereas, the second case ignores thermal softening. Detailed study of the effect of various other parameters such as indenter size, indentation depth and sliding speed is earned out for both the cases. On comparing these two cases, it is observed that inclusion of temperature has a pronounced effect on the results. The difference in the equivalent plastic strain between the two cases is nearly 50% and the von Mises stress is observed to differ by nearly 30%. These differences suggest that it is essential to include the effect of temperature in the numerical studies of two-body abrasion. The residual stress for the thermo-mechanical analysis is compared with the stresses obtained in the pure mechanical analysis and a difference in the stresses is observed in both the cases.
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Author: Gang Wei
Author: Martijn Woldman
Author: Gloria Hee-kyung Yang
Author: Ioan D. Marinescu
Author: Ambrish Misra
Author: William J. Renault
Author: Theo Naicker
Author: Sanjeev Anand Torvi
Author: Satryo Soemantri