... and the friction coefficient (COF), the damage mechanism, and wear volume were determined. The use of an energetic approach allowed to determine the energetic wear coefficient. CrSiN coating revealed a low friction coefficient (around 0.1) and a low energetic wear coefficient (6.3 × 10 −7 mm 3 /N.m). In addition...

...Mohammad I. Albakri; Firas S. Jarrar; Marwan K. Khraisheh This paper studies the effects of interfacial friction distribution on the integrity of superplastic formed parts. For that purpose, the deformation of AA5083 superplastic aluminum alloy into a long rectangular box is investigated. The die...

... between inelastic phenomena such as cracking, splitting, and frictional slipping occurring on planes of various orientations though not the interactions at a distance. To avoid spurious mesh sensitivity due to softening, the crack band model is adopted. Its band width, related to the material...

...J. B. Jordon; M. F. Horstemeyer; S. R. Daniewicz; H. Badarinarayan; J. Grantham The fatigue behavior of friction stir spot welds in magnesium AZ31 alloy is experimentally investigated and modeled. The friction stir spot welds employed in this study are representative of preliminary welds made...

...P. Edwards; M. Ramulu An experimental study was conducted to identify acceptable welding parameters for friction stir welding Ti-6Al-4V butt joints, ranging from 3 mm to 12 mm in thickness. The primary parameters of interest were the spindle speed and feed rate. Welds were produced using spindle...

..., but there is a threshold for embedded fiber volume fraction at specific parameters, over which the plastic flow and friction may be insufficient to have a strong bond at foil/foil interfaces between fibers. The study also showed that base metal thickness did not have significant influence on the interfacial strength...

... complicated to realize than the extension one and requires some particular considerations owing to the friction condition occurring between the specimen and the dies. This paper deals with a new specimen shape proposed to realize both static and dynamic compression tests. The independence of the material...

...Sangjoon Park; Chang Gil Lee; Junehyung Kim; Heung Nam Han; Sung-Joon Kim; Kwansoo Chung A process to improve formability and spring-back was developed for AA5xxx-H temper sheets based on the surface friction stir (SFS) method. In the SFS method, a rotating probe stirs the sheet surface so...

... diameters but strongly dependent on the strain-hardening behavior of the material and the friction between a material and an indenter. Compared with other shaped indenters, the flat-ended indenter requires the least penetration depth in order to probe the plastic properties of a material or structure...

... with friction in the framework of nonassociative and non-normal formulation. The associated numerical aspects concerning both the local integration of the coupled constitutive equations as well as the (global) equilibrium integration schemes are presented. The local integration is outlined, thanks to the Newton...

... localization develops in a manner consistent with experimental observations. The application of friction constraints to the compression surfaces—as is present in channel die compression tests—dramatically strengthens and redistributes the localization patterns. The simulated biaxial bulge test also...

... impair Li -ion battery performance. In our previous study, we correlated conductivity and compression of these materials. Here, we further investigated the effects of friction and deformability of particles on the compressibility of model carbons of Li -ion anodes. First, we implemented a statistically...

...Wei Yang; Hongtao Wang; Y. Huang When two material surfaces are brought into contact, the classical Amonton’s law predicts a monotonically increasing relation between the frictional force and the normal pressure. An abnormal friction law refers to the case where the friction force declines...

.... Mater. Technol. 0094-4289 , 127 ( 4 ), pp. 383 – 392 . Bowden , F. P. , and Tabor , D. , 1950 , The Friction and Lubrication of Solids , Clarendon , Oxford. Johnson , K. L. , Kendall , K. , and Roberts , A. D. , 1971 , “ Surface energy and contact of elastic...

...Daw-Kwei Leu and; Jen-Yu Wu 29 06 2004 drawing (mechanical) work hardening friction plasticity The correct form of Eq. ( 16 ) is as follows: (16) R 0 r 1 c = LDR = e 1 + n [ 2   fe − n − e − μ π / 2 t...

...Xinling Ma; Hongtao Wang; Wei Yang An abnormal friction law refers to the case where the friction force does not increase monotonically with the normal pressure. We investigate the possibility of abnormal tribological behavior for two surfaces coated with aligned single-walled carbon nanotubes...

...Daw-Kwei Leu, Professor; Jen-Yu Wu, Technical Instructor A new and practically applicable equation, including the normal anisotropy R, the strain hardening exponent n, the friction coefficient μ, and the bending factor t 0 / r d for estimating the limiting drawing ratio LDR (a measure...

... bending finite element analysis friction fracture forging metals forming processes stress-strain relations tensile strength crystal microstructure Sheet metal forming is a major fabrication process in many sectors of industry. Throughout the years, technological advances have allowed...

... is parallel to the drawing direction, the main influence will be on the friction between workpiece and die. The Institute for Metal Forming Technology of the University of Stuttgart, Germany started a project to investigate the effect of ultrasonic waves on the tribology and on the formability...

...Hasan Sofuoglu, Assistant Professor; Hasan Gedikli, Research Assistant; Jahan Rasty, Associate Professor, The main objective of this research was to investigate the effect of material properties, strain-rate sensitivity, and barreling on the behavior of friction calibration curves. The compression...