Terms:
SAE International Journal of Materials and Manufacturing
AND
2
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Genesis of the Third-Body at the Pad-Disc Interface: Case Study Of Sintered Metal Matrix Composite Lining Material

SAE International Journal of Materials and Manufacturing

Ecole Centrale de Lille-Yannick Desplanques, Gérard Degallaix
  • Journal Article
  • 2009-01-3053
Published 2009-10-11 by SAE International in United States
During braking, third-body flows and layers govern friction mechanisms, which are fully responsible of the friction coefficient and wear. In the context of development of brake friction pairs, the involved tribological circuit has to be well understood and mastered. This paper concerns a sintered metal matrix composite used for TGV very high speed train. A series of low-energy stop brakings allows a detailed study of the third-body formation at the pad-disc contact. The pin surface is observed after each test. The evolution of the rubbing-area expansion all along the series is explained, and the friction behaviour, typical of the studied friction material, is related to the formation of a well-established third body at the pad-disc interface.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Application of Extension Evaluation Method in Development of Novel Eco-friendly Brake Materials

SAE International Journal of Materials and Manufacturing

Beijing University of Chemical Technology-Rongping Yun, Yafei Lu
Southern Illinois University Carbondale-Peter Filip
  • Journal Article
  • 2009-01-3019
Published 2009-10-11 by SAE International in United States
Extenics is a new cross discipline to study rules and methods of solving contradictory problems in the real world. The basic concepts and theoretical frame of extenics are briefly introduced in this paper. Based on the merit of extenics, the extension evaluation method was applied to evaluate the brake materials according to a five-grade criterion established in this study. Considering the results computed by the original and simplified models, the similar conclusions were made: all four brake samples, marked A - D, were evaluated in the first grade based on the calculated dependence degrees, and sample B was judged as the best performing friction material with the highest dependence degree and the lowest wear rate. The preliminary results verify that it is feasible to apply the extension evaluation method for the development of friction materials, and the five-grade criteria established in this study can be applied for analyzing the results of the Friction Assessment and Screening Test (FAST) scientifically.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Sphere-To-Cone Mating – New Solution to Improve Brake Tube Connector Sealing Robustness

SAE International Journal of Materials and Manufacturing

Stanislav I. Pliassounov
  • Journal Article
  • 2009-01-3024
Published 2009-10-11 by SAE International in United States
Recently invented solutions (Canadian Patent 2593305 and United States Patent Applications 20090015008 and 20070194567) incorporate sphere-to-cone type of the interaction between sealing surfaces in a brake tube connector. An interaction of sphere-to-cone type has numerous advantages over one with a cone-to-cone type which is currently utilized in conventional automotive brake tube connectors. Incorporation of a sphere-to-cone interaction between the sealing surfaces dramatically improves connector's sealing robustness. Sphere-to-cone based connectors are resilient to the tube and seat axes misalignment. Correspondingly, sphere-to-cone based connectors have less variation of the securing torque and virtually no propensity to locked misalignment occurrence. The article analyzes another fundamental advantage of a sphere-to-cone mating over the conventional cone-to-cone one. The analysis reveals that sphere-to-cone type of interaction demonstrates approximately one order of magnitude (10 times) less sensitivity to common dimensional variation. A Robust Design approach has been utilized for sealing capability analysis and comparison. The transfer functions with respect to the sealing capability of both current cone-to-cone based connectors and new sphere-to-cone based connectors have been obtained and compared. The comparison suggests…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Effects of Chemical Components and Manufacturing Process of Cast Iron Brake Disc on its Resonant Frequency Variation

SAE International Journal of Materials and Manufacturing

Hyundai & Kia Corporate Research & Development Division-Jae Young Lee, Hyun Dal Park, Seong Jin Kim, Jae Min Han, Yoon Cheol Kim, Jong Dae Lim, Jeong Kyu Kim
  • Journal Article
  • 2009-01-3030
Published 2009-10-11 by SAE International in United States
Many engineers have been working to reduce brake noise in many ways for a long time. So far, a progress has been made in preventing and predicting brake noise. Nevertheless, there are some discrepancies of brake noise generation propensity between testing for the prototype and the production. As known in general, the reason for this unpredicted brake noise occurrence in production is partly due to the variation of the resonant frequency, material and the other unpredictable or unmanageable variations of the components in a brake system. In this paper, effects of chemical components and casting process of gray iron brake disc on its resonant frequency variation have been studied. Especially this paper is focused on the variation in material aspects and manufacturing parameters during disc casting in usual production condition. And their effects are investigated by the variation of out-of-plane modal resonant frequency.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Application of Innovative PVD Coating to Stamping Dies for Processing Ultra-High Tensile Strength Steel Sheets

SAE International Journal of Materials and Manufacturing

KOBAC, KOBELCO Advanced Coating America Inc-Yoshinobu Hosokawa, Kazuki Takahara
Kobe Steel Ltd-Kenji Yamamoto, Susumu Kujime, Tatsuya Yasunaga, Koichiro Akari
  • Journal Article
  • 2009-01-1170
Published 2009-04-20 by SAE International in United States
A novel nitride based coating system (BELCOAT-SS) was developed for the stamping dies for ultra high-tensile strength steel. It is characterized by an excellent wear resistance and low deposition temperature compare to the conventional diffusion coatings such as VC or TiC. High temperature wear test indicate that the wear rate of the new coating is 2 to 10 lower than conventional diffusion coatings. The result of stamping test using ultra-high tensile steel sheets indicate that life time of the die can be prolonged by the factor of at least 5 to 10 times.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Axial and Bending Fatigue of a Medium Carbon Steel Including Geometry and Residual Stress Effects

SAE International Journal of Materials and Manufacturing

Eaton Corporation-Steve McCutcheon
The University of Toledo-Sean McKelvey, Ali Fatemi
  • Journal Article
  • 2009-01-0422
Published 2009-04-20 by SAE International in United States
This paper discusses the effects of changes in specimen geometry, stress gradient, and residual stresses on fully-reversed constant amplitude uniaxial fatigue behavior of a medium carbon steel. Axial fatigue tests were performed on both flat and round specimens, while four-point rotating bending tests were performed only on round specimens. All the tests were performed using shot peened and unpeened flat and round samples, to investigate the effects of compressive residual stresses on fatigue behavior. The specimens in the rotating bending tests experienced longer life for a given stress amplitude than in the axial test. Shot-peening was found to be beneficial in the long life region, while in short life tests the shot-peened samples experienced a shorter life than the unpeened samples under both axial and bending test conditions. Specimen geometry had a minimal effect on fatigue life and the difference observed between the behavior of round and flat samples is thought to be due to slightly different hardness levels of the two specimen geometries. The data generated from the aforementioned tests and conditions and the…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Theoretical Model for the Elastic-Plastic Behaviour of Spot Welded Joints

SAE International Journal of Materials and Manufacturing

University of Rome “Tor Vergata”-Francesco V ivio, Michele Ferracci
  • Journal Article
  • 2009-01-0026
Published 2009-04-20 by SAE International in United States
An analytical procedure for the evaluation of the elasticplastic behavior of spot welded joints is presented. The procedure is based on a new theoretical model of spot weld region: a circular plate having variable thickness with a central rigid nugget. The closed-form solution allows to describe the displacement of a rigid nugget when an axial orthogonal load is applied on the plate while plasticity and moderately large deflections are present. The goal is to reach a reliable spot weld region model which can be used as the basis to develop a spot weld element in FE analysis even when plasticity and large deflections are in effect. The analytical results obtained by using the new general relations precisely match those obtained modelling spot weld area by FEA.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Viscosity Controlled High Penetration Wax on Paint Process

SAE International Journal of Materials and Manufacturing

Automobile R&D Center, Honda R&D Co., Ltd-Yasuhisa Shimizu, Takahide Maeda
  • Journal Article
  • 2009-01-0894
Published 2009-04-20 by SAE International in United States
The wax has been developed that is able to protect vehicle bodies from corrosion for extended periods. Vehicle bodies, composed mainly of steel components, are prone to corrosion, in particular side sills and various flanges. These sections are generally coated with wax to protect them from water, primary corrosion-promoting factor, enabling manufacturers to offer extended warranties against corrosion perforation in their catalogs. However, while corrosion prevention systems using conventional waxes contribute significantly to increased corrosion prevention, they result in increased costs, for example for dedicated wax coating lines in production lines, and require specialized lines tailored to specific vehicle bodies. Areas such as side sills and various flanges require careful attention to, and particularly high standards of, corrosion prevention. Particular attention to coating required in these areas tends to increase volume of coating material employed. Wax developed in this project displays excellent penetration. Material is able to penetrate into flanges, enabling achievement of a high level of anti-corrosion performance using a reduced amount of wax. This wax is controlling the viscosity characteristic of material, and…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Improvements in Detector Design for X-ray Inspection of Cast Parts

SAE International Journal of Materials and Manufacturing

Fraunhofer Development Center X-ray Technology (EZRT)-N. Uhlmann
Fraunhofer Institute Integrated Circuits (IIS)-O. Scholz, P. Schmitt, M. Kube, R. Behrendt
  • Journal Article
  • 2009-01-0212
Published 2009-04-20 by SAE International in United States
The results of automatic X-ray inspection of cast parts rely heavily on the quality of the imaging components. Flat panel detectors suffer from a number of flaws, the most serious being long-term stability and image quality.This paper presents a new X-ray detector design which can increase defect detection quality, cost efficiency and long term stability of an industrial automatic X-ray inspection system.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Mechanical Behavior and Failure Mechanism of Nb-Clad Stainless Steel Sheets

SAE International Journal of Materials and Manufacturing

Pacific Northwest National Laboratory-K. S. Weil
University of Michigan-K. Asim, W. F. Hosford, J. Pan
  • Journal Article
  • 2009-01-1393
Published 2009-04-20 by SAE International in United States
Because niobium-clad 304L stainless steel sheets are considered for use as bipolar plates in polymer electrolyte membrane (PEM) fuel cells, their mechanical behavior and failure mechanism are important to be examined. As-rolled and annealed specimens were tested in tension, bending and flattening. The effects of annealing temperature and time on the mechanical behavior and failure mechanism were investigated. Micrographic analyses of bent and flattened specimens showed that the as-rolled specimens have limited ductility and that the annealed specimens can develop an intermetallic layer of thickness of a few microns. The annealed specimens failed due to the breakage of intermetallic layer causing localized necking and the subsequent failure of Nb layer. The springback angles of the as-rolled and annealed specimens were also obtained from guided-bend tests. Nano-indentation tests indicated that the intermetallic layer exhibit much higher values of hardness and elastic modulus as compared to those of the stainless steel and Nb sheets.
Annotation ability available