Terms:
SAE International Journal of Materials and Manufacturing
AND
6
AND
1
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.

Characterization of Advanced High Strength Steel Sheets in View of the Numerical Prediction of Sidewall Curl

SAE International Journal of Materials and Manufacturing

Colorado School of Mines-Chester Van Tyne, Lee Rothleutner
Narmco Corp-Matthew Rodzik
  • Journal Article
  • 2012-01-2326
Published 2013-01-21 by SAE International in United States
In this study, a procedure for characterizing advanced high strength steel sheets is presented in view of determining the material parameters for constitutive models that can be used for accurate prediction of springback and sidewall curl.The mechanical properties of DP980 and TRIP780 sheets were obtained experimentally, and their cyclic tension-compression behaviour was modeled with the Chaboche nonlinear kinematic hardening model and the Yoshida-Uemori two-surface plasticity model that are implemented in LS-DYNA. The unloading moduli were determined from monotonic tension tests at various prestrain levels. An inverse approach based on linear and quadratic response surfaces created by Sequential Strategy with Domain Reduction (SRSM) methodology using LS-OPT software was used and investigated to identify specific material parameters in each constitutive model.It was found that the quadratic meta-model with a quadratic approximation of history variables was able to accurately reproduce the cyclic stress-strain data when multiple tension-compression cycles are considered.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Lightweight DLC Coated Valve Lifter Made from Beta Titanium Alloy for Motorcycles

SAE International Journal of Materials and Manufacturing

Yamaha Motor Co., Ltd-Kosuke Doi, Hirotaka Kurita
  • Journal Article
  • 2012-32-0088
Published 2012-10-23 by SAE International in United States
An ultra lightweight valve lifter made from titanium alloy was developed for high performance motorcycles. A beta titanium alloy that was fulfilling not only higher strength but also cold forgeability was selected among several types of titanium alloys. A solution treatment and aging combined with the cold forging made a refinement of the grain size of beta phase. As a result, a tensile strength and an elongation of the alloy were reached to 1170MPa and 10.3% respectively. During the solution treatment, oxygen diffusion (OD) treatment was also performed on the beta titanium alloy. The surface hardness of OD layer was increased up to as high as 600 HV. Subsequently, a diamond like carbon (DLC) layer having a hardness value of around 2500HV was formed on the titanium substrate in order to provide a superior tribological property. In between the DLC layer and the substrate, a sputtered Ti layer was formed as an intermediate adhesive layer. The intermediate layer resulted in preventing from any damage for example flaking or pitting of the DLC layer and realized…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Lightening Approach for Small Vehicles by Developing Extruded Aluminum Suspension Arm

SAE International Journal of Materials and Manufacturing

Suzuki Motor Co Ltd-Gouki Yotsuya, Ryo Yamauchi
  • Journal Article
  • 2012-32-0094
Published 2012-10-23 by SAE International in United States
This paper shows the lightening approach for small vehicles by developing lower arm of the hollow extruded aluminum, which is the low cost material and has closed cross section. The manufacturing cost was reduced by developing the industrial method to form the developed lower arm of the extruded aluminum by cold press, without welding. In addition, the developed method forming of the heat-treated extruded aluminum reduces the manufacturing cost more, compared to the conventional method forming before the heat treating. The structure of the developed lower arm has the wide center part receiving the coil spring and the narrow end part connecting to the vehicle body with the bush. The center part has the same cross section as the extruded aluminum, and the end part was formed by shrinking the extruded aluminum by cold press. In addition, the original expanding clinching method was developed to joint the aluminum outer tube of the bush for the prevention action against the galvanic corrosion.As mentioned above, the lightening approach for the suspension parts of small vehicles have been…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Waterborne Conductive Primer for Motorcycles

SAE International Journal of Materials and Manufacturing

Honda R&D Co., Ltd.-Akiko Tanaka, Tomoyuki Inoue, Shinsuke Mochizuki
Nippon Bee Chemical Co., Ltd.-Masanobu Inoue
  • Journal Article
  • 2012-32-0089
Published 2012-10-23 by SAE International in United States
Most types of paint materials currently used for motorcycles contain large amounts of VOCs (Volatile Organic Compounds). VOCs are environmental load substances, and there is a demand to reduce emissions in recent years. Many of a motorcycle's exterior parts are made of ABS (Acrylonitrile-Butadiene-Styrene) plastics (henceforth ABS) or PA (Polyamid) plastics (henceforth PA). These two plastic materials have different film adhesion mechanisms and adhesion strength. Therefore it was necessary to use different conductive primers and that's was one of the factors which made time and material losses in the painting processes. We solved those two issues, the reduction of VOCs and the common use of the same conductive primer for different parts materials, by combining two kinds of resins originally designed as the conductive primers, i.e., urethane resins with carboxylic acid groups and acrylic resins with amide groups, which are different in properties. Many of the plastic parts used in motorcycles are painted manually because there are difficult portions to be painted by automated painting machines. The viscosity was adjusted to satisfy both the controllability…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Halogenated Lithium Manganese Oxide AB2O4-dXd Spinel Cathode Material

SAE International Journal of Materials and Manufacturing

US Army RDECOM, CERDEC, CPI-Terrill B. Atwater, Paula Tavares
  • Journal Article
  • 2012-01-2211
Published 2012-10-22 by SAE International in United States
The benefits of lithium battery systems lie within their high energy density (Wh/L) and high specific energy (Wh/kg). Manganese dioxide (MnO2) is an attractive active cathode material because of its high energy density and low material cost. Manganese dioxide is an intercalating compound for lithium that functions by solvating and desolvating lithium cations from the electrolyte in solid state. The lithium cations are deposited into the vacancies of the MnO2 cathode crystal structure. The objective of this effort focuses on the limited cycle life of rechargeable lithium manganese-based electrochemical systems, most importantly capacity fading of the cathode. These two characteristics are considered the major technology hurdles in rechargeable lithium battery technology.1, 2, 3, 4
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

High Temperature, High Energy Density Dielectrics for Power Electronics Applications

SAE International Journal of Materials and Manufacturing

Pennsylvania State University-Dennis P. Shay, Clive A. Randall
  • Journal Article
  • 2012-01-2208
Published 2012-10-22 by SAE International in United States
Mn and/or rare earth-doped xCaTiO₃ - (1-x)CaMeO₃ dielectrics, where Me=Hf or Zr and x=0.7, 0.8, and 0.9 were developed to yield materials with room temperature relative permittivities of Εr ~ 150-170, thermal coefficients of capacitance (TCC) of ± 15.8% to ± 16.4% from -50 to 150°C, and band gaps of ~ 3.3-3.6 eV as determined by UV-Vis spectroscopy. Un-doped single layer capacitors exhibited room temperature energy densities as large as 9.0 J/cm₃, but showed a drastic decrease in energy density above 100°C. When doped with 0.5 mol% Mn, the temperature dependence of the breakdown strength was minimized, and energy densities similar to room temperature values (9.5 J/cm₃) were observed up to 200°C. At 300°C, energy densities as large as 6.5 J/cm₃ were measured. These observations suggest that with further reductions in grain size and dielectric layer thickness, the xCaTiO₃ - (1-x)CaMeO₃ system is a strong candidate for integration into future power electronics applications.To further improve the high temperature, high field reliability of these material systems, rare earth donor doping has been utilized. Initially, 1 mol%…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Experimental Investigation of Light Metal Scrap on Out-of-Plane Tea Ring and Shredding Test

SAE International Journal of Materials and Manufacturing

Kunming University of Scie. and Techn.-Jianxiong Liu
  • Journal Article
  • 2012-01-2062
Published 2012-09-24 by SAE International in United States
The objective of “Experimental Investigation of Light Metal on Out-of-Plane Tearing and Shredding Test (wall thickness less than or equal to 10mm)” is to find solutions to shredding and recovery processing of end-of-life vehicles and household appliances. By way of tensile test, the mechanical characteristics of the light metal scrap material were obtained. On the basis of strengthening effect, the constitutive relations of materials were reduced to bilinear model. Through the trousers test, Light Metal Scrap produced equal and opposite elastic-plastic bending deformation twice in the tearing process was observed. So in process of trousers tearing test, the total work external force did was mainly composed of specific tearing work and elastic-plastic bending work of trousers legs. The features of light metal scrap materials in tearing and shredding process are investigated, and the specific tearing work per unit area of new crack surface was regarded as a tearing property of light metal. The specific tearing work under different loading rate was compared and that the specific tearing work is not insensitive to loading rate in…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Thermal Effects in Friction Materials - A Comprehensive Strategy for Modeling and Simulation

SAE International Journal of Materials and Manufacturing

TU Braunschweig-Kai Bode, Georg-Peter Ostermeyer
  • Journal Article
  • 2012-01-1793
Published 2012-09-17 by SAE International in United States
Shorter product cycles, a high awareness for comfort properties on the customer side and an increasingly strict legislation with respect to environmental issues make the development of friction materials more and more challenging. In contrast to many other engineering tasks, nearly no software tools are available to the material developer, which systematically support the development process with simulations.This work focuses on the time-dependent three-dimensional heat distribution inside a pad material and shows, how heterogeneous material mixtures can be modeled, such that a prediction of non-stationary temperature fields becomes possible. In this context, a strategy is suggested, how the thermal interaction between pad and disk and the aspects of energy dissipation and heat partitioning can be described appropriately.The outcome is a simulation system that not only returns local temperature values for arbitrary boundary conditions, but which also makes a prediction of heat-induced physical and chemical phenomena possible, as they occur inside the material. Different case studies show how e.g. the oxidation of certain components or the degassing of the organic binder can be described. These concepts…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Interference-Fit Bolted Joining of Hybrid Metal/Composite

SAE International Journal of Materials and Manufacturing

Beijing Aeronautical Mfg Tech. Res. Inst.-Qingyun Zhao, Yu Lei, Liu Huadong, Liu Fenglei, Ren Chong
  • Journal Article
  • 2012-01-1867
Published 2012-09-10 by SAE International in United States
Joints represent potential weak points in the structure, the design of the overall structure tends to follow from the design of the joint. To date, metal/composite joints are general in current aircraft structure. Some of the reasons for lower joint efficiency in composites are: brittleness which means little stress relief around the highest loaded holes, anisotropy which leads to higher stress concentration factors, low transverse strength, susceptibility to delamination, and sensitivity to environmental conditions. All of these factors together with the complexity of composite failure modes make the analysis and design of composite joints far more complex than that of metallic joints. Fatigue failure is the root cause which makes aircraft unserviceable. 75-80% of fatigue failures occur in the joints of structure, therefore researching joints is very important for improving aircraft life.Much effort has been put into solving the technical challenge for composite bolted joints. In this study the interference-fit bolted joining of composite/metal hybrid has been studied. Composite and metal plates were purchased and clipped. Fasteners for interference-fit were manufactured, and the methods of…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Stretch Roll Forming

SAE International Journal of Materials and Manufacturing

Fairmount Technologies LLC-Palanivel Swaminathan, Mahdi Saket Kashani, Viswanathan Madhavan
  • Journal Article
  • 2012-01-1873
Published 2012-09-10 by SAE International in United States
This paper documents the development of a novel CNC metal forming process called “Stretch roll forming”. It is an extension of the three roll forming (or slip-roll) process, wherein many pairs of roller-like dies mounted on positioning slides are used to approximate the instantaneous geometry of the part being formed, and to guide the formation of extrusions and sheets into desired shapes. The revolutionary enhancement is that, a stretch force sufficient to induce tensile yielding of the entire section is superimposed on the workpiece while it is being formed, by applying appropriate traction forces on the workpiece at each of the contact points. Tensile stretching avoids bucking of the section, and increases the strength of the part while reducing spring back and residual stresses. A further revolutionary improvement arises from replacing rollers with short die segments. The shape of the die can be changed to accommodate different cross-sections of extrusions. Dynamic changes in the location of the die can be used to produce parts with varying curvature along the length of the part. In addition…
Annotation ability available