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Technical Paper

An Experimental Setup for Investigations on the Boundary Layer Dynamics

2020-10-05
2020-01-1617
The frictional behavior of a tribological contact is influenced by the dynamics in the forming boundary layer. Recurring structures, built up through self-organizing effects, were found in various frictional systems. To investigate those phenomena on a macroscopic scale and to better understand dynamical processes such as the formation and decay of contact patches, the first revision of the Wear Debris Investigator (WDI) was introduced in 2017. A friction gap is formed between two coaxial horizontally arranged discs. To mimic the presence of particles, artificial wear dust is fed into the gap. With a camera the formation of the boundary layer is recorded in situ. An implemented normal force and torque sensor enables to recognize correlations between the formed boundary layer and the occurring frictional forces. Numerous measurements revealed an insufficient precision of the previous WDI.
Technical Paper

Promising natural organic rosin based composites fabricated at stove top temperature

2020-09-25
2020-28-0452
Rosin is a naturally available organic material obtained especially from pine trees. It finds many usages and applications in areas like soldering, pharmaceuticals, building work, engineering field etc. In this work, an attempt was made to study experimentally the improvement in strength of rosin at normal stove top temperature by means of combining rosin in various ratios with some important organic hardeners and chemicals of literature importance. A table top book press was fabricated for the purpose of rosin pressing using simple tools like teak wood, bolt and nuts. Experiments were conducted using commonly used kitchen gas stove, fabricated book press, rosin raw material, aluminium sulfate powder, maleic anhydride chemical, acetone, ethanol and saw dust particles for making different combination materials using rosin as the main element. Results showed that, rosin on its own without additives showed higher viscosity and brittleness.
Technical Paper

Experimental investigation on Biogas Production from Waste Press Mud and Cow Dung under Anaerobic Condition

2020-09-25
2020-28-0467
Anaerobic digestion of textile wastes under mesophilic conditions were conducted in batch mode with aim of investigating the bio-methane evolution with an initial solid mass of cow dung – 2 kg, cotton and water in 3:1 ratio and press mud is use in the ratio 3:1 with water were evaluated subsequently for 7 weeks (42 days).The highest production of biogas is noted as 3 m3 in fourth week and the higher production of biogas due to press mud is noted as 0.49 in the fifth week.Carbon dioxide is produced as bi product in this bio digestion process. Highest production rate of methane,biogas and carbon dioxide are in their fourth week. Through this experiment 65%-75% of bio gas is collected by the fourth week.
Technical Paper

Hybrid Belt driven starter generator electric motor shaft and claw poles press fit simulation and correlation with physical measurements.

2020-09-25
2020-28-0488
Belt-driven starter generator claw pole electric motors are used in hybrid automobiles to start the engine, charge the battery and to power the electrical system when its engine is running. Shaft and claw pole are important components in the claw pole electric motor. The shaft is fitted into the claw pole through press-fit force. Press-fit is a widely used fastening process to join two different components by pushing a component inside or over another component with high press force which will create a strong bond between the components. Determining press-fit force required to assemble parts is very complex since it depends on a lot of factors such as mechanical material properties of components, interference fit condition whether it is in Min, mean and max condition, amount of contact pressure induced by contact surface, co-efficient of friction created in between components. The press-fit will help to prevent loosening components from its bond at high torque and speed.
Technical Paper

Tribological Behaviour of Carbon Fibre Reinforced Bio degradable Material as an Alternative Frictional Brake Pad in Automobiles

2020-09-25
2020-28-0513
The brake pad is one of the most essential part of vehicle. Due to environmental requirements, natural materials are the raising alternative source for manufacturing degradable specimens. The intern of this work is to study the comparison of using carbon fibre and sisal fibre with using cashew nut shell liquid resin (CNSL), cashew nut filler, alumina and graphite. Two formulae and four samples of each set were prepared by varying the fibre type using hydraulic press under optimum process parametric conditions. The prepared samples are taken for tribo test using pin-on-disc tribometer apparatus at room temperature as per ASTM standards. In this load of 10,20,30,40N and sliding distance of 1000,2000,3000m applied and responds like wear rate and co-efficient of friction were noted . On further scanning, electron microscopic analysis was done to observe wear mechanics with the formation of very fine detritus on the surface that was worn out and counter face of composite.
Technical Paper

Providing of Sliding Bearings Reliability of Transmissions Gear Wheels of Transport Cars by Optimization of Assembly Tolerances

2020-09-15
2020-01-2239
In the design of gearboxes and transfer boxes of heavy-duty vehicle`s transmissions, sliding bearings are often used as supports for gear wheels. Analysis of the results of statistical processing of gearbox parts failures and transfer boxes of wheeled tractors with a pulling force of 30 kN indicates the need to improve the reliability of the sliding bearings of the gear wheels. Such plain bearings ensure free rotation of the gear wheels in case of the torque transmission absence, and when locked by a clutch, the radial load of the gear wheel is sensed, while operating in the slipping rolling mode. Such units are poorly understood and in the technical literature sources there are no recommendations for their engineering, which often leads to errors when selecting operation gaps and press fitted in gear wheels. The manufacturers of the transmissions assemblies replaced the plain bearings, which in this case are made of metal-ceramic bushes, for roller bearings.
Journal Article

Quench Rate Study on AA7075 with Advanced Aging and T6

2020-07-21
Abstract The aluminum alloy 7075 sheets have drawn more attention in recent years in the automotive industry for lightweighting. Hot stamping of high-strength aluminum alloy has been developed to improve the formability of the part without springback. Obtaining an adequate quench rate is a critical step of the hot stamping process and corresponds to good strength and corrosion resistance. This work looks at measuring the quench rate of 7075 at advanced aging (AA) and T6 condition via two different approaches: forced air and water with various temperatures. The results verify that water is a superior form of quenching, i.e., from 50°C/s to 550°C/s, the forced air-cooled quench rate is 2°C/s-10°C/s. Besides, mechanical properties such as yield strength, ultimate tensile strength, and uniform elongation were measured by tensile testing. As a result, a correlation between the quench rate and final mechanical properties was developed.
Standard

Terminology for Titanium Microstructures

2020-07-16
CURRENT
AS1814F
This list of terms, with accompanying photomicrographs where appropriate, is intended as a guide for use in the preparation of material specifications.
Standard

Identification Marking Methods

2020-06-26
WIP
AS478Q

This standard provides the following:

a. Definition of terms pertaining to marking.

b. Symbols for marking location.

c. Requirements and restrictions for permanent markings.

d. Types of marking methods.

e. Rules for designating marking methods.

f. Table listing marking methods.

Standard

Aluminum Alloy, Extruded Wide Panel Profiles (7150-T77511) 6.4Zn - 2.4Mg - 2.2Cu - 0.12Zr Solution Heat Treated, Stress-Relieved, Straightened and Overaged

2020-05-05
CURRENT
AMS4325A
This specification covers an aluminum alloy in the form of extruded wide panel profiles (shapes) and rod and bars 0.500 to 1.000 inch, inclusive (12.7 to 25.4 mm, inclusive) in thickness, produced with cross sectional area of 14 to 30 square inches (90 to 194 square centimeters) from circumscribing circle diameters (see 8.3) of 14 to 22 inches (356 to 559 mm) (see 8.8).
Standard

Standard Metrology for Vehicular Displays

2020-04-29
WIP
J1757/1
The scope of this SAE Standard is to provide methods to determine display optical performance in all typical automotive ambient light illumination - with focus on High Ambient Contrast Ratio, which is critical for display legibility in a sunshine environment. It covers indoor measurements and simulated outdoor lighting.

It is not the scope of this document to set threshold values for automotive compliance. However some recommended values are presented for reference.

Standard

Aluminum Alloy, Extruded Rod, Bar, and Profiles (7055-T76511) 8.0Zn - 2.3Cu - 2.0Mg - 0.16Zr Solution Heat Treated, Stress-Relieved, and Overaged

2020-04-28
CURRENT
AMS4336B
This specification covers an aluminum alloy procured in the form of extruded bars, rods, and profiles (shapes) with nominal thickness up to 3.000 inch (76.20 mm), inclusive, and having a cross-sectional area of 12 square inches (77 square centimeters) maximum and circle size of 10 inches (254 mm) maximum (see 8.6).
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