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Parking Brake Structural Integrity Test Procedure Vehicles Over 4500 kg (10 000 lb) GVWR—Truck and Bus

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J1476_201910
  • Current
Published 2019-10-21 by SAE International in United States
This SAE Recommended Practice establishes a method of evaluating the structural integrity of the parking brake system of all new trucks, buses, and combination vehicles designed for roadway use in the following classifications: TRACTOR, TRAILER, TRUCK, AND BUS: over 4500 kg (10 000 lb) GVWR.
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Corrosion Test Master Establishment

Wheel Standards Committee
  • Ground Vehicle Standard
  • J2636_201910
  • Current
Published 2019-10-21 by SAE International in United States
This SAE lab recommended practice may be applied to corrosion test methods such as salt spray, filiform, Corrosion creep back, etc. This procedure is intended to permit corrosion testing to be assessed between Laboratories for correlation purposes.
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Design Analysis and Development of High-Speed Rotating Fatigue Testing with Integrated by Twisting Test

Avinash Prakash Barve, Rahul Jangam, Adm Aman Soni, Pravin Pandagre, Hardik Bhautkar, Bhushan Chapke, Shantanu Bankar, Faisal Hussain, Adm Paresh Setiya
Published 2019-10-11 by SAE International in United States
The fatigue testing machine mostly used for industrial or laboratory applications are limited to performing single fatigue tests with high leading cost. In the present paper the experimental setup of the traditional fatigue testing machine is integrated with torsional test, to experimentally study the effect of fluctuating stresses on the material under service. In contradiction to earlier machines, the machine herein developed provides uniform bending and twisting moment distribution along the length of the test specimen. The machine performs fatigue test and torsional test, which provides the extreme force needed to understand the properties and behavior of materials. The machine consists of an electric motor to provide the required torque and two circular arms with adjustable chucks to fit test samples of various sizes. The machine provides computerized data for failed samples with data pertaining to each sample. The experimental model is designed and fabricated to match our customers unique test objective. Fatigue failures are reported 75% of documented materials failure and occur catastrophically. Fatigue life can be tested on loading conditions and it is…
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High-Sensitivity, Low-Noise MEMS Accelerometer

  • Magazine Article
  • TBMG-35294
Published 2019-10-01 by Tech Briefs Media Group in United States

A high-sensitivity and low-noise MEMS accelerometer was developed using multi-layer metal structures composed of multiple metal layers. The accelerometer achieves 1 μG level resolution that has been a challenging task with conventional MEMS technology. The team previously proposed a method of using gold material to downscale the proof mass size of MEMS accelerometers to less than one-tenth. In this work, they have increased the proof mass per area by employing multiple layers of gold for the MEMS structures, thereby increasing the sensitivity over 100 times and reducing noise less than one-tenth when compared with conventional accelerometers.

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Waveform Synthesis for Shock Response Spectrum Replication, Applied to Ground Vehicle Component Testing

  • Magazine Article
  • TBMG-35354
Published 2019-10-01 by Tech Briefs Media Group in United States

The motivation for this work is to mitigate shock levels on vehicle components, through testing new designs of equipment. The objective is to generate a time history to perform shock testing on military and commercial ground vehicle components. The time histories are used to drive hydraulic actuators coupled to a test specimen.

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Local Weakening of Honeycomb Core for Improved Surface Quality and Bonding in Co-Cured Sandwich Panels

Hamburg University of Technology-Henrik Eschen, Thorsten Schüppstuhl
Published 2019-09-16 by SAE International in United States
Sandwich panels made of Nomex honeycomb core and fiber reinforced face sheets are a major component of aircraft interior parts. A common way to locally increase the strength of such panels, e.g. for load introduction, is the local thickening of the face sheets with additional prepreg layers. Curing of strengthened panels without further processing of the core leads to higher flatness tolerances as well as residual stresses. Machining of the core in the strengthened areas is possible, but expensive due to high machine costs and additional cleaning processes. In this paper a new process for the reduction of the residual stresses in strengthened areas, as well as improved bonding between core and face sheets is presented. The process is based on local reduction of the compressive strength in the surface area of the honeycomb core, which allows for controlled, irreversible deformation at curing pressure. For the reduction of compressive strength, a concept based on a robot guided tool with multiple blades is presented. The process parameters impacting the compressive strength after weakening are derived based…
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Simultaneous Imaging and Friction Measurement with an In-Situ Tribometer

  • Magazine Article
  • TBMG-35121
Published 2019-09-01 by Tech Briefs Media Group in United States

Different instruments are needed to study the interaction of contact surfaces at different length scales. Tribometers measure the coefficient of friction but they cannot image the microscale or nanoscale contact area. Atomic Force Microscope (AFM) techniques can image surfaces at smaller scales but they do not enable tests to be performed with probe materials (e.g., steel) and properties (e.g., roughness) needed to represent many important, realistic tribological applications. Removing a sample to change instruments can expose the region of interest to environmental contaminants, and can lead to changes in the physical and chemical properties of the sliding zone.

Precise Temperature Measurements with Invisible Light

  • Magazine Article
  • TBMG-35139
Published 2019-09-01 by Tech Briefs Media Group in United States

A portable, stable, standards-quality radiation thermometer was invented that can measure temperatures between -50 °C (-58 °F) to 150 °C (302 °F). The corresponding infrared wavelengths are from 8 to 14 micrometers.

Device Simplifies Measurement of Fluoride Contamination in Water

  • Magazine Article
  • TBMG-35149
Published 2019-09-01 by Tech Briefs Media Group in United States

Adding fluoride to water has been common practice in a number of countries including the U.S. In low concentrations (below 1.5 mg/L), fluoride can help prevent tooth decay and strengthen bones; however, at higher levels, it can have the opposite effect, causing serious dental and bone disease, especially in children and developing fetuses. To determine whether drinking water is safe, fluoride must be detected in water at a parts-per-million (ppm) level. Measuring fluoride at such low concentrations with sufficient accuracy is expensive and requires a well-equipped chemical lab.

Miniature Spring Performance Tester

  • Magazine Article
  • TBMG-35140
Published 2019-09-01 by Tech Briefs Media Group in United States

In order to qualify miniature springs, manufacturers of these systems rely on commercially available testers that are designed for large-scale springs (>0.5" diameter). Commercially available spring test systems lack sufficient force resolution or cyclic test capabilities for miniature-scale springs. Traditional spring testers work on the basis of compressing (or extending) a spring to a known deflection and recording that force value, then moving to the second known deflection and recording that force value. This is done manually by a user and has no capability of automation or fatigue.