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Generalized Maxwell Model Parameter Estimation of a Viscoelastic Material from High Frequency Direct Dynamic Mechanical Analysis (DMA) Test

The University of Akron-Roja Esmaeeli, Haniph Aliniagerdroudbari, Siamak Farhad
  • Technical Paper
  • 2020-01-1074
To be published on 2020-04-14 by SAE International in United States
Polymers as viscoelastic material grab a grate attention in industry due to their high strength, light weight and low manufacturing cost. Therefore, studying the properties of polymers has a great importance. In several applications the analytical tools are used to simulate the situation due to its lower cost and time consumption than experiments. In order to simulate the viscoelastic material properties in analytical tools, theoretical models such as such as Generalized Maxwell Model (GMM) are used. Usually the viscoelastic constitutive parameters for GMM are calculated by fitting the model to the master curve obtain from a Dynamic Mechanical Analysis (DMA) test. DMA is a testing method for viscoelastic material characterization by applying the stress or strain to a viscoelastic material and measure the response. Commercial DMAs are not able to operate accurately at high frequency thus they use the time temperature superposition principle and Williams, Landel and Ferry (WLF) shift factor to obtain the high frequency results from the low frequency tests. Several limitations and problems for the WLF equation are reported. The procedure of…
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Customer Perception of Road Induced Structural Feel

GM-Mark Stebbins
GM R&D Center-John Cafeo
  • Technical Paper
  • 2020-01-1080
To be published on 2020-04-14 by SAE International in United States
A vehicle program’s timing and viability can be affected by subjective assessments made by engineering teams predicting customer perceptions of many different attributes. In this paper we explore the relationship of those assessments to match customer perceptions for the attribute of structural feel. The eventual goal of work like this is to develop an objective metric that could be used by the product development organization. The first step in developing a metric is to assess whether road induced structural feel can be sensed by the customer. An internal drive clinic was an effective approach for obtaining customer perception of structural feel. Vehicles which spanned excellent structural feel to poor structural feel were chosen as part of the experimental design. The participants, which comprised three groups (panelists, experts, and executives) were able to rank order the vehicles’ structural feel performance essentially the same and in the order determined a priori. This clinic study indicates that structural feel is strongly related to vehicle ride. Experts are good predictors of both panelists and executive responses. Results from objective…
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A New Approach to Comprehensive Modeling of Sheet Metal Tensile Test Data using a Universal Exponential Expression

University of Colorado Denver-Luis Sanchez Vega
  • Technical Paper
  • 2020-01-0751
To be published on 2020-04-14 by SAE International in United States
This work aims to providing an improved fit to continuously describe tensile test behavior over arbitrary quasi-static regression fit techniques. The tensile test, commonly defined by elastic, transient, and exponential regions, is represented here by a continuous curve spanning from the unstrained state to the post uniform regions. Since the model is continuous, proportionality and yield points between regions are not defined. This continuous behavior is described by an exponential expression defined in the logarithmic stress-strain coordinate system, from which the model fit is determined. In this logarithmic scale, we found that the data is bound by segments of concave and/or convex curvatures which end approach asymptotically towards straight lines. The coordinates of the fit in the logarithmic scale are defined at the intersection of the asymptotes, and the material fits are found from the optimum regression fit. The accuracy of the fit was validated at quasi-static speeds for four different sheet materials: cold rolled deep drawing quality, dual phase DP590, and dual phase DP780 steels, and an aluminum alloy AA6916. The fitting accuracies improved…
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Fitting, Plug-in Union, Ring Locked, 24 Degree Cone, Fluid Connection, 5080 psi (35 000 kPa), Specification for

G-3C, AS-EN Harmonization Committee
  • Aerospace Standard
  • AS5000E
  • Current
Published 2020-01-23 by SAE International in United States

This SAE Aerospace Standard (AS) establishes the requirements for 24 degree cone AS5827 or EN 6123 flareless ring locked fitting assemblies per AS5550 and AS5865, for use in aircraft fluid systems at nominal operating pressure of 5080 psi (35000 kPa) maximum and operating temperature range of -65 to +275 °F (-54 to +135 °C). The general requirements shall be for, but not limited to, commercial aircraft hydraulic components per AS4941, using port configuration as specified in AS5551.

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FITTINGS, TUBE, FLUID SYSTEMS, SEPARABLE, HIGH PRESSURE, DYNAMIC BEAM SEAL, DESIGN STANDARD FOR MALE END

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS85720/1A
  • Current
Published 2020-01-14 by SAE International in United States

Scope is unavailable.

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FITTING ASSY, ELBOW, REDUCER, 90°, SWIVEL, BULKHEAD, REDUCED BODY, FLARELESS

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS7447
  • Current
Published 2020-01-13 by SAE International in United States

Scope is unavailable.

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FITTING, ELBOW 90°, BULKHEAD SEALING, EXTERNAL SWAGE TO FLARELESS

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6469
  • Current
Published 2020-01-13 by SAE International in United States

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FITTING, UNION, BULKHEAD SEALING, EXTERNAL SWAGE

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6474
  • Current
Published 2020-01-06 by SAE International in United States

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FITTING, TEE, SWIVEL NUT TO MALE FLARELESS ON RUN, EXTERNAL SWAGE ON SIDE

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6494
  • Current
Published 2019-12-26 by SAE International in United States

SCOPE IS UNAVAILABLE.

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FITTING END ASSEMBLY, INTERNAL THREAD, RETAINED NUT, BEAM SEAL, DESIGN STANDARD

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS4209C
  • Current
Published 2019-12-26 by SAE International in United States

SCOPE IS UNAVAILABLE.