Terms:
SAE International Journal of Materials and Manufacturing
AND
8
AND
3
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.

Volumetric and Dynamic Performance Considerations of Elastomeric Components

SAE International Journal of Materials and Manufacturing

Ohio State University-Scott Allen Noll, Benjamin Joodi, Jason Dreyer, Rajendra Singh
  • Journal Article
  • 2015-01-2227
Published 2015-06-15 by SAE International in United States
Elastomeric joints such as mounts and suspension bushings undergo broadband excitation and are often characterized through a cross-point dynamic stiffness measurement; yet, at frequencies above 100 Hz for many elastomeric components, the cross- and driving-point dynamic stiffness results significantly deviate. An illustrative example is developed where two different sized mounts, constructed of the same material and are shaped to achieve the same static stiffness behavior, exhibit drastically different dynamic behavior. Physical insight is provided through the development of a reduced order single-degree-of-freedom model where an internal resonance is explained. Next, a method to extract the parameters for the reduced order model from a detailed finite element bushing model is provided. Further, a new benchmark experiment is used to validate the simulated behavior and provide insight into certain frequency dependent behavior where internal elastic modes of elastomeric component are present. Finally, the effect of the internal resonance is examined within the context of a hybrid vibro-acoustic vehicle system model. It is demonstrated that the internal mount resonance exhibits a significant influence on the sound pressure sensitivity…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Comparative Assessment of Frequency Dependent Joint Properties Using Direct and Inverse Identification Methods

SAE International Journal of Materials and Manufacturing

Ohio State University-Benjamin Joodi, Scott Allen Noll, Jason Dreyer, Rajendra Singh
  • Journal Article
  • 2015-01-2229
Published 2015-06-15 by SAE International in United States
Elastomeric joints are utilized in many automotive applications, and exhibit frequency and excitation amplitude dependent properties. Current methods commonly identify only the cross-point joint property using displacement excitation at stepped single frequencies. This process is often time consuming and is limited to measuring a single dynamic stiffness term of the joint stiffness matrix. This study focuses on developing tractable laboratory inverse experiments to identify frequency dependent stiffness matrices up to 1000 Hz. Direct measurements are performed on a commercial elastomer test system and an inverse experiment consisting of an elastic beam (with a square cross section) attached to a cylindrical elastomeric joint. Sources of error in the inverse methodology are thoroughly examined and explained through simulation which include ill-conditioning of matrices and the sensitivity to modeling error. The identified translational dynamic stiffness and loss factor values show good agreement between the two identification methods, though challenges remain for the rotational and coupling stiffness terms. The experimental methods are applied to two different elastomeric materials of the same geometry.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Determination of the Transfer Matrix for Isolators Using Simulation with Application to Determining Insertion Loss

SAE International Journal of Materials and Manufacturing

University of Kentucky-Shishuo Sun, David W. Herrin, John Baker
  • Journal Article
  • 2015-01-2226
Published 2015-06-15 by SAE International in United States
Transmissibility is the most common metric used for isolator characterization. However, engineers are becoming increasingly concerned about energy transmission through an isolator at high frequencies and how the compliance of the machine and foundation factor into the performance. In this paper, the transfer matrix approach for isolator characterization is first reviewed. Two methods are detailed for determining the transfer matrix of an isolator using finite element simulation. This is accomplished by determining either the mobility or impedance matrix for the isolator and then converting to a transfer matrix. It is shown that results are similar using either approach. In both cases, the isolator is first pre-loaded before the transfer matrix is determined. The approach to find isolator insertion loss is demonstrated for an isolator between two plates, and the effect of making changes to the structural impedance on the machine side of the isolator by adding ribs is examined. After which, the value of isolator insertion loss as a metric is examined for a case where multiple isolators are used on a construction cab. The…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Modeling and Characterization of a Novel Porous Metallic Foam Inside Ducts

SAE International Journal of Materials and Manufacturing

Ain Shams University-Maaz Farooqui, Tamer Elnady
Scania AB-Ragnar Glav
  • Journal Article
  • 2015-01-2203
Published 2015-06-15 by SAE International in United States
A novel porous metallic foam has been studied in this work. This composite material is a mixture of resin and hollow spheres. It is lightweight, highly resistive to contamination and heat, and is capable of providing similar or better sound absorption compared to the conventional porous absorbers, but with a robust and less degradable properties. Several configurations of the material have been tested inside an expansion chamber with spatially periodic area changes. Bragg scattering was observed in some configurations with certain lattice constants. The acoustic properties of this material have been characterized from the measurement of the two-port matrix across a cylindrical sample. The complex density and speed of sound can be extracted from the transfer matrix using an optimization technique. Several models were developed to validate the effect of this metallic foam using Finite Elements and the Two-port Theory. There was a good agreement between both models and the measurement results.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Fatigue Life Calculation under Thermal Multiaxial Stresses in EGR Coolers

SAE International Journal of Materials and Manufacturing

BorgWarner Emissions Systems-Julio Carrera, Alvaro Sanchez
University of Seville-Alfredo Navarro
  • Journal Article
  • 2015-01-0440
Published 2015-04-14 by SAE International in United States
Recent emissions standards have become more restrictive in terms of CO2 and NOx reduction. This has been translated into higher EGR rates at higher exhaust gas temperatures with lower coolant flow rates for much longer lifetimes. In consequence, thermal load for EGR components, specially EGR coolers, has been increased and thermal fatigue durability is now a critical issue during the development.Consequently a new Thermo-Mechanical Analysis (TMA) procedure has been developed in order to calculate durability. The TMA calculation is based on a Computational Fluid Dynamics simulation (CFD) in which a boiling model is implemented for obtaining realistic temperature predictions of the metal parts exposed to possible local boiling. The FEM model has also been adjusted to capture the correct stress values by submodeling the critical areas.Life calculation is based on a Multiaxial Fatigue Model that has also been implemented in FEM software for node by node life calculation. This model takes into account the effect of temperature using the stresses obtained in linear elastic FEM analyses and the temperature dependent properties of the metal. Material…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Al-Mn-Cu-Mg Brazing Sheet Core Alloys for Automotive Heat Exchanger Units for Service at High Temperatures

SAE International Journal of Materials and Manufacturing

CanmetMATERIALS Technology Laboratory-Haiou Jin, Yimin Zeng, Jie Liang, M.S. Kozdras
  • Journal Article
  • 2015-01-0515
Published 2015-04-14 by SAE International in United States
New aluminum alloys, based on a commercial Al-Mn-Cu brazing sheet core alloy, with increasing alloying element Mg up to 2 wt.%, have been developed for automotive heat exchanger units in service at above 200°C. The new Al-Mn-Cu-Mg alloys are to be used as the core material in brazing sheets for vacuum and nickel brazing technologies. They were DC cast to 3.75″ lab sized ingots, scalped, re-heated to 520°C, hot rolled to 4.8 - 5mm, and cold rolled down to a final gauge of 1mm. It has been demonstrated by various mechanical and corrosion testing that Mg contributes a strong solid solution hardening effect at both the room and elevated temperatures, without damaging the other mechanical properties or corrosion resistance. Hence the alloys with 1 - 2 wt.% Mg are able to maintain high yield strength above 60 MPa at 200 - 300°C, with no reduction in formability and very limited decrease in corrosion resistance. Since the new alloys do not contain expensive alloying elements, there is no significant increase in material or processing costs.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Strength Analysis of CFRP Composite Material Considering Inter-Laminar Fractures

SAE International Journal of Materials and Manufacturing

Honda R&D Co., Ltd.-Tadashi Naito, Yuta Urushiyama
  • Journal Article
  • 2015-01-0694
Published 2015-04-14 by SAE International in United States
The strength characteristic of CFRP composite materials is often dependent on the internal micro-structural fracture mode. When performing a simulation on composite structures, it is necessary to take the fracture mode into account, especially in an automobile body structure with a complex three-dimensional shape, where inter-ply fractures tend to appear due to out-of-plane load inputs. In this paper, an energy-based inter-ply fracture model with fracture toughness criteria, and an intra-ply fracture model proposed by Ladeveze et al. were explained. FEM analyses were performed on three-dimensional test specimens applying both fracture models and the simulated results were compared with experimental ones. Reproducibility of the fracture mode was confirmed and the importance of combining both models was discussed.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of γ′-Fe4N Phase Control Technology and Low-Carbon Alloy Steel for High-Strength Nitrided Gear

SAE International Journal of Materials and Manufacturing

Dowa Thermo Engineering Co., Ltd.-Masao Kanayama
Dowa Thermotech Co., Ltd.-Yuichiro Shimizu
  • Journal Article
  • 2015-01-0519
Published 2015-04-14 by SAE International in United States
A new nitriding technology and material technology have been developed to increase the strength of microalloyed gears. The developed nitriding technology makes it possible to freely select the phase composition of the nitride compound layer by controlling the treatment atmosphere.The treatment environment is controlled to exclude sources of supply of [C], and H2 is applied as the carrier gas. This has made it possible to control the forward reaction that decomposes NH3, helping to enable the stable precipitation of γ′-phase, which offers excellent peeling resistance. A material optimized for the new nitriding technology was also developed. The new material is a low-carbon alloy steel that makes it possible to minimize the difference in hardness between the compound layer and the substrate directly below it, and is resistant to decline in internal hardness due to aging precipitation in the temperature range used in the nitriding treatment. The combination of these developed technologies has increased gear strength more than 50% against conventional gas-nitrocarburized products.This research also determined that the peeling resistance of the compound layer changed with…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Impact upon Applicability of Metal Fuel Tank Using Different Biodiesel

SAE International Journal of Materials and Manufacturing

Automotive Research & Testing Center-Ta-Wei Tang, Ko Wei Lin
LC Fuel Tank Manufacture Co.-Steven Chan
  • Journal Article
  • 2015-01-0521
Published 2015-04-14 by SAE International in United States
With the development of world economy, the shortage in the supply of oil energy as well as the greenhouse effect have become a public concern around the world. The application of biodiesel on vehicle transportation has become the focus of development in many countries. Biodiesel, Fatty Acid Methyl Esters (FAME), is made during the process of transesterification of the animal and vegetable oils. Compared with fossil diesel, biodiesel has some characteristics, such as organic acid, higher water saturation, and oxygen content. From the results of the literatures [1] to [5], it showed that biodiesel would cause the inflation of some plastic and flexible products and the corrosion of metal materials.Metal fuel tanks have the characteristics of high flammability, high impact resistance, and good workability and are often used in commercial vehicles. The corrosion of metal materials is a natural chemical change and it can be influenced by the environment. The metal materials soaked in biodiesel will show different rates of corrosion and phenomenon, influenced by the factors such as water content, PH value, dissolved oxygen,…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of a Comprehensive Validation Method for Dynamic Systems and Its Application on Vehicle Design

SAE International Journal of Materials and Manufacturing

Chongqing University-Junqi Yang, Zhenfei Zhan, Chong Chen, Yajing Shu, Ling Zheng
Ford Motor Co-Ren-Jye Yang, Yan Fu, Saeed Barbat
  • Journal Article
  • 2015-01-0452
Published 2015-04-14 by SAE International in United States
Simulation based design optimization has become the common practice in automotive product development. Increasing computer models are developed to simulate various dynamic systems. Before applying these models for product development, model validation needs to be conducted to assess their validity. In model validation, for the purpose of obtaining results successfully, it is vital to select or develop appropriate metrics for specific applications. For dynamic systems, one of the key obstacles of model validation is that most of the responses are functional, such as time history curves. This calls for the development of a metric that can evaluate the differences in terms of phase shift, magnitude and shape, which requires information from both time and frequency domain. And by representing time histories in frequency domain, more intuitive information can be obtained, such as magnitude-frequency and phase-frequency characteristics. However, Most of the existing metrics only focus on time domain. In this paper, a validation method combining analysis in time and frequency domain is proposed. Two analytical cases are then utilized for the illustration of the proposed method…
Annotation ability available