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Viewing 151 to 180 of 19612
Technical Paper
2014-04-28
M.J. Rathod, R.L. Rithe
Abstract Friction stir spot welding (FSSW) is a recent solid state welding technology. This welding technique is energy efficient, environment friendly, and versatile. FSSW is a novel derivative of Friction-Stir Welding (FSW) which is proving to be a better alternative to Resistance Spot Welding (RSW). In this work FSSW of aluminium alloy 6061-T6 and mild steel sheets of thickness 1.5 mm was evaluated using circular pin tool. Tool rotation speed, plunge depth and dwell time were varied to determine the effect of individual process parameter on lap shear separation load. Process parameters were optimized by using Taguchi technique. The optimum values for processing parameters were obtained as 2800 rpm rotational speed, 0.9 mm plunge depth and 8 sec dwell time. Maximum lap shear load of about 2250N was obtained. Joint interface is very clean no inter metallic compound is observed at the Al/Fe interface.
Technical Paper
2014-04-28
Sumeet Mishra, Piyush Priyadarshi, Kaustubh Kulkarni, N. P. Gurao, Prasad Phale, Suhail Mulla
Abstract The effect of different cold- rolling and cryo-rolling routes on the strength and ductility of Al-6061 alloy was thoroughly investigated. Rolling decreased the grain size and increased the strength according to the Hall-Petch relationship. However subjecting the samples to ageing at different temperatures and for different time period increased the strength and improved the ductility. The ductility was improved due to the rearrangement and even decrease in dislocation density due to recovery and recrystallization during ageing while the strength was maintained due to ageing. Evolution of microstructure was investigated by optical microscopy, scanning electron microscopy. Preliminary hardness measurements coupled with tensile tests indicate the improvement of both yield strength and ductility. The disparity in ultimate tensile strength, yield strength and the elongation to failure with different ageing temperatures and for different time period is determined and discussed.
Technical Paper
2014-04-28
A. R. Kumbhar, S. A. Kulkarni, J. M. Paranjpe, N. V. Karanth
Abstract New process development of forging component require lot of process knowledge and experience. Even lots of trial-and-error methods need to be used to arrive at optimum process and initial billet dimensions. But with help of reliable computer simulation tools, now it is possible to optimize the complete process and billet dimensions without a single forging trial. This saves lot of time, energy and money. Additionally, simulation gives much more insight about the process and possible forging defects. In this paper, a complete forging process was needed to be designed for a complex component. With the help of computer simulation, the complete conventional forging process and modified forging process were simulated and optimized. Forging defects were removed during optimization of the process. Also billet weight optimization was carried out. Deciding the pre-forming shape of the billet was the main challenge. With use of computer simulation, an innovative pre-forming shape was arrived resulting in reducing billet input weight.
Technical Paper
2014-04-28
M.J. Rathod, T.R. Karale
Abstract Friction stir welding (FSW) is a solid state welding technology specially used for joining non ferrous alloys like aluminium-alloys, magnesium alloy etc. FSW have various advantages over conventional welding method like low distortion of material, lower loss of alloying materials, high strength of joint, energy efficient, environment friendly, and versatile. The present studies aimed to understand microstructural changes and associated mechanical properties of the joints produced by using FSW. In this work aluminium alloy Al6061-T6 and Al5052 sheets of thickness 3mm were used for joining. Parameters changed for joining were tool rotational speed, traverse speed and tool geometry with conical pin and hexagonal pin. These process parameters were optimized using design of experiment technique. The welded joints were tested for tensile properties and impact toughness. Metallographic observations of joints were carried out using optical microscopy; scanning electron microscopy. Hardness profile and residual stress were also investigated
Technical Paper
2014-04-28
Ingrid Rasquinha, Reji Koshy Daniel
Abstract Environment, energy and safety concerns for vehicles have made improving strength-to-weight ratio of vehicles an imperative issue for the automobile industry. Tube hydroforming (THF) is an innovative forming technology, which can efficiently reduce the weight of a component or assembly, and at the same time, increase the part strength. THF produces parts with a high degree of part complexity (various cross-sections in a single piece) and dimensional stability. Tube hydroforming involves the expansion and sizing of tubes in a closed die under dynamic action of pressurized fluid, with simultaneous axial or radial compression. Best forming results can be achieved by the optimized combination of process parameters (internal pressure, feed, friction, load, blank thickness) and material properties (yield strength, tensile strength, n-value, r-value, elongation).With the help of case studies, this thesis presents how tube hydroforming has been used to shave mass off some conventionally produced auto components like chassis cross-members, trailing arms, crash members and exhaust housings.
Technical Paper
2014-04-28
Pradip K Patra, Srimanta Sam, Mrigandra Singhai, Neel Kant
Abstract Automobile manufacturers have started using ultra high strength steel (UHSS) in lower thicknness to reduce the weight of their car and improved passenger safety. As a result steel manufacturers are facing continuous challenges to develop Ultra high strength steels (UHSS) in lower thicknesses with suitable formability. In line with this, Indian steel manufacturers has also started developing different UHSS which includes hot rolled DP540/DP590/DP780/SPF590 etc. for automotive wheel rim applcation and S500MC/S650MC for automotive log and cross member application. ALM650 is one such UHSS grade recently developed whose yield strength (YS) requirement is >650 MPa, tensile strength (UTS) requirement is >700 MPa and total elongation >14%. This newly developed UHSS, conforms to the specification of S650MC as per EN-10149-2. Chemistry and rolling parameters were designed taking into consideration of mechanical properties requirement including fatigue strength, suitable microstructure to achieve this combination of properties as well as the CSP process characteristics.
Technical Paper
2014-04-28
N. P. Gurao
Abstract Formability of metals and alloys in general and aluminium alloys and steels in particular is of paramount importance in sheet metal forming in automobile industry. It is well understood that the evolution of preferred crystallographic orientation of crystallites or texture during prior thermo-mechanical processing of sheets plays an important role in determining formability. The formability of sheet is measured in terms of the Lankford parameter or the plastic strain ratio which is defined as the ratio of strain in width direction to that in the thickness direction (R = εw/εt). The variation of Lankford parameter with the rolling direction and standard and ΔR value is widely used in industry as a standard for estimating the formability of the rolled sheets. In the present investigation, we have used the viscoplastic self-consistent simulations to theoretically calculate the variation of the Lankford parameter with rolling direction for different crystallographic texture in model face centre cubic and body centre cubic material.
Technical Paper
2014-04-28
Yathish Rao
Abstract An important use of axle shaft is to transmit the power between two parallel planes. Axle shaft can experience severe impact load when there is sudden drop in clutch pedal during the vehicle operation under loaded condition. Insufficient case depth and lower core hardness could cause the low subsurface shear strength of the material. This would result in torsional permanent deformation, phenomenon called Twist in the axle shaft. In order to improve the metallurgical property of the material, the axle shaft is redesigned & strengthened by suitable heat treatment process. The surface of the shaft is induction hardened and the core is toughened (hard & tempered) which would enhance the subsurface & core property of the material particularly shear strength of the material. The correlation between the applied shear stress & material inherent shear strength is used to determine the optimum shaft diameter. The current shaft is modified for increase in case depth, core hardness, shaft diameter & subjected to Ultimate Torsional bench Test.
Technical Paper
2014-04-28
M. J. Rathod, H. A. Deore
Abstract Desired mechanical properties including wear resistance at affordable price are the key parameters for which ductile cast irons are widely selected. Particularly, in many automobile applications like brake cylinders, camshafts, connecting rods, gears, pistons and yokes ductile iron is used. Traditionally surface heat treatments like induction hardening and in recent times electron beam and laser hardening are used to improve wear and fatigue resistance of ductile irons. However, the laser surface hardening has a lot of advantages over others such as low distortion due to high power density, flexibility, accuracy, lack of quenching medium and limited grain growth. In this work, laser surface hardening of Ferrito pearlitic ductile iron grade has been carried out. Hardening was performed with a 400W continuous wave fiber laser with the objective to investigate the effect of local tempering in continuous laser multi-pass laser surface hardening on hardness profile of the specimen.
Technical Paper
2014-04-28
Swapnil Pawar, Sandip Patil, Suhas Joshi, Rajkumar Singh
Abstract Tapping is an important process in assembly of aircraft structures because on an average one millions of tapped holes are made on an aircraft structure. However, sudden breakage of the tap is the most undesirable event frequently encountered during the tapping process. In particular, this can mostly occur when small diameter internal threads are made in a ‘difficult-to-cut’ material like titanium. For this reason, it has been a topic of industrial interest in the manufacturing sector for many years. The ultrasonic vibrations assisted tapping (UVAT) is a novel manufacturing technology, where ultrasonic vibrations are provided to the work piece in the axial direction. The present work is a comprehensive study involving experimental characterization. The experimentation shows that UVAT reduces the torque during tapping as compared to that of in conventional process. There is a 19.1% reduction in torque and about 20.3% reduction in cutting temperature in UVAT over that of in CT. The experimental analysis of UVAT process also shows that the superior surface and better machinability in UVAT over that of in CT.
WIP Standard
2014-04-27
This specification covers beryllium in the form of sheet and plate produced by hot rolling beryllium block.
WIP Standard
2014-04-27
This specification covers beryllium in the form of bars, rods, tubing, and machined shapes from vacuum hot pressed powder.
WIP Standard
2014-04-27
This specification covers beryllium in the form of bar, rod, tubing, and shapes fabricated from beryllium powder consolidated by hot isostatic pressing (HIP).
WIP Standard
2014-04-27
This specification covers beryllium in the form of bars, rods, tubing, and machined shapes from vacuum hot pressed powder.
WIP Standard
2014-04-27
This specification covers beryllium in the form of bars, rods, tubing, and machined shapes from vacuum hot pressed powder.
WIP Standard
2014-04-27
This specification covers aluminum-beryllium powders consolidated by hot isostatic pressing (HIP) into the form of bar, rod, tubing, and shapes.
WIP Standard
2014-04-27
This specification covers an aluminum-beryllium alloy in the form of bars, rods, tubing, and shapes consolidated from powder by extrusion.
WIP Standard
2014-04-27
This specification covers beryllium in the form of bar, rod, tubing, and shapes fabricated from beryllium powder consolidated by cold isostatic pressing (CIP) and sintering.
WIP Standard
2014-04-27
This specification covers an aluminum-beryllium alloy in the form of sheet and plate consolidated from powder by extrusion and then rolled.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
WIP Standard
2014-04-27
This specification covers quality assurance sampling and testing procedures used to determine conformance to applicable specification requirements of wrought carbon and low-alloy steel products and of forging stock.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
WIP Standard
2014-04-27
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
Article
2014-04-25
The demand for innovative manufacturing technology that produces lighter parts with stronger material grows each day in the competitive aerospace industry. 3-D printing, also known as “additive manufacturing,” is at the center of this innovation.
Standard
2014-04-24
This specification covers a titanium alloy in the form of investiment castings.
Standard
2014-04-24
This specification covers a titanium alloy in the form of investment castings having four grades of permissible discontinuities.
Standard
2014-04-24
This specification covers titanium Ti 6Al-4V alloy in the form of investment castings.
Viewing 151 to 180 of 19612

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