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Viewing 1 to 30 of 10002
2015-06-09
Event
2015-06-09
Event
2015-06-09
Event
2015-04-14
Technical Paper
2015-01-0738
Joseph R. Kish, Zach Cano, Alexandra Kobylecky, Joseph McDermid, Timothy Skszek, John Kukalis
The purpose of this study was to conduct a comparative corrosion assessment of alloys and coating schemes of interest for the fabrication of multi-material lightweight vehicle architectures. Alloys considered for this application included galvanized steel, aluminum alloy 6111 and magnesium alloy ZEK100. The coating scheme considered for corrosion protection included a typical paint scheme (clear coat over top base coat enamel) applied to the alloy surface pre-treated using a commercially available conversion coating and electrocoated prior to painting. The magnesium ZEK100 alloy was also tested with an alternative plasma electrodeposition pre-treatment process applied to the surface as part of the coating scheme. The corrosion assessment of the scribed coated alloys was conducted after 1000 h exposure in the ASTM B117 salt fog environment.
2015-04-14
Technical Paper
2015-01-0520
Takaaki Kitahara, Takuo Imai, Osamu Ishigo, Miodrag Perovic
In recent years, there has been a requirement for automotive bearings materials to be free of the toxic material lead, in accordance with ELV regulations and from the perspective of environmental problems. Currently, bismuth is often used as a replacement for lead in copper alloy based main bearings and connecting rod bearings for automotive engines. Previous bismuth-containing copper alloy bearing materials have shown satisfactory seizure resistance, but conformability has not been as good as for lead-containing bearing materials. As a result, they have been successfully applied to automotive diesel engines, but not for truck engines where improved conformability is required to better accommodate irregularities such as foreign particles. To improve the conformability, a softer bearing material is desirable. Furthermore, in recent years bearing materials containing hard particles have been widely used with the improvement of seizure resistance and wear resistance.
2015-04-14
Technical Paper
2015-01-1356
Atishay Jain
Swingarm, originally known as the swing fork or pivoted fork is a dynamic structural part of the rear suspension of most modern motorcycles. It is used to hold the rear axle firmly, while pivoting vertically on the frame, to allow the suspension to absorb bumps in the road. Driving and braking loads are also transmitted through the swing arm, and thus, it plays a major role in vehicle dynamics. Weight minimization is important in a swingarm as it is largely an unsprung mass. The conventional swingarm design includes steel tubing and sheet metal structures. Due to higher forces near the pivot, conventional swingarm are inherently over-designed as they use tubular structures of same cross section through the entire length of the swingarm. An aluminum alloy swingarm design even when subjected to casting manufacturing constraints, has the potential for better material layout and weight minimization.
2015-04-14
Technical Paper
2015-01-0687
Guang Wang, Xueyuan Nie, Jimi Tjong
In order to reduce the weight of an automotive engine, an aluminum alloy engine block without cast iron liner has been successfully used to replace the gray cast iron engine. However, the low surface hardness of the aluminum alloy may cause high wear and friction on the aluminum cylinders. To overcome these drawbacks, a few surface processing technologies are used to protect the surface of cylinders. Among them, plasma transferred wire arc (PTWA) thermal spraying coating is becoming popular. Plasma electrolytic oxidation (PEO) coating is also proposed for increasing the wear resistance of aluminum alloy and reducing the friction between the cylinder and piston. In this work, a PEO coating with a thickness of 15 um was prepared, and a high speed pin-on-disc tribometer was used to study the tribological behavior of the coating at oil lubricant conditions. Different surface roughness of the coating and a large range of the sliding speeds were employed for the tests.
2015-04-14
Technical Paper
2015-01-0702
Bita Ghaffari, Jonathan Dekam, Kevin Haddix, Kimberly Lazarz, Sergey Titov, Roman Maev
Adhesive bonding technology has gained increased significance in automotive industry, especially with the growing use of aluminum alloy body structures. The variability in thicknesses of the metal and adhesive layers, as well as the variability in joint geometry, of automotive components has presented challenges in nondestructive evaluation of adhesive joints. These issues have recently been resolved for steel-adhesive joints through the use of an ultrasonic pulse-echo technique. The difference in acoustic impedance of steel and Al, however, leads to a lack of robustness in using the same technique for Al-adhesive joints. In this paper, we present the results from utilizing a modified version of this pulse-echo algorithm to inspect Al-adhesive joints in both laboratory and production environments. A 52-element, 10 mm X 10 mm, 15-MHz matrix array of ultrasonic transducers was used to obtain the echotrains, analysis of which produced a C-scan image of the adhesive bead.
2015-04-14
Journal Article
2015-01-0537
Hong Tae Kang, Abolhassan Khosrovaneh, Xuming Su, Yung-Li Lee, Mingchao Guo, Chonghua Jiang, Zhen Li
Magnesium alloys have low weldability, thus self-piercing rivet (SPR) joint is one of options for joining them. This research investigates the fatigue performance of SPR for magnesium alloys including AZ31, AM30, and AM60. Lap-shear and coach peel specimens for these alloys are fabricated and tested for understanding fatigue performance of the joint. Structural stress – life (S-N) curves are developed with the test results. This approach is validated with simple structural specimens that include three or two joints in each specimen. It is also intensively studied to identify the proper representation of the joint in finite element models.
2015-04-14
Journal Article
2015-01-0515
Haiou Jin, Yimin Zeng, Jie Liang, M.S. Kozdras
New aluminum alloys, based on a commercial Al-Mn-Cu brazing sheet alloy with alloying element Mg up to 2 wt.%, have been developed for automotive radiators serviced at temperatures above 200°C. The new Al-Mn-Cu-Mg alloys are to be used as core material in brazing sheets for vacuum brazing and Ni plate brazing. They were DC cast to 3” lab sized ingots, homogenized at 520°C, hot rolled to 5.5 - 5.8mm, 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. Therefore, the new alloys have shown high yield strength above 60 MPa at 200 - 300°C service temperatures, with no reduction in formability and very limited reduction in corrosion resistance.
2015-04-14
Technical Paper
2015-01-0511
Bradford Johnson, John Henshaw, Nia R. Harrison, S. George Luckey
Increasing fuel economy is a high priority of the automotive industry due to consumer demand and government regulations. High strength aluminum alloys such as AA7075-T6 can be used in strength-critical automotive applications to reduce vehicle weight and thus improve fuel economy. However, these aluminum alloys are known to be susceptible to stress corrosion cracking (SCC) for thick plate. The level of susceptibility to SCC must be determined before a material is implemented. ASTM standards exist that generate semi-quantitative data primarily for use in screening materials for SCC. For the purposes of this work ASTM G139 (breaking load method) has been used to evaluate sheet AA7075-T6 for use in automotive applications. A tensile fixture applying a constant strain was used to quantitatively measure residual strength of the material after exposure to a corrosive environment.
2015-04-14
Technical Paper
2015-01-0516
Nan Wang
Current die design recommendations attempt to limit the production of burrs through accurate alignment of the upper and lower edges. For aluminum automotive exterior panels, this translates to a gap less than 0.1 mm. However, the tolerances required by such standards often exceed the capabilities of many trim dies. Experimental results on influence of trimming conditions on the shape of the sheared surface will be combined with the results of stretching strips after trimming. The objective of the research described in this paper is to study the mechanism of fracture generation and cracks propagation during half-a-dog bone tensile test representing stretch flanging condition. One side of the sample had sheared surface obtained by the trimming process while the other side of the sample had a smooth surface. The effect of texture of the sheared edge on stretchability of Al sheet was investigated. Significant attention was paid to understanding of fracture sources.
2015-04-14
Journal Article
2015-01-0510
Joy Hines Forsmark, Zachary Dowling, Kelsey Gibson, Caroline Mueller, Larry Godlewski, Jacob Zindel, James Boileau
Magnesium die-cast alloys are known to have a layered microstructure composed of: (1) An outer skin layer characterized by a refined microstructure that is relatively defect-free; and (2) A “core” (interior) layer with a coarser microstructure having a higher concentration of features such as porosity and externally solidified grains (ESGs). Because of the difference in microstructural features, it has been long suggested that removal of the surface layer by machining could result in reduced mechanical properties in tested tensile samples. To examine the influence of the skin layer on the mechanical properties, a series of round tensile bars of varying diameters were die-cast in a specially-designed mold using the AM60 Mg alloy. A select number of the samples were machined to different final diameters. Subsequently, all of the samples (as-cast as well as machined) were tested in tension.
2015-04-14
Journal Article
2015-01-0528
Armin Abedini, Cliff Butcher, David Anderson, Michael Worswick, Timothy Skszek
The development of stress state dependent fracture surfaces and damage models to predict failure in automotive forming and crash simulations has created great interests in developing experimental tests to characterize failure in constant stress states. The stress state is defined by the three invariants of the stress tensor that are typically expressed in terms of the stress triaxiality and lode parameters. The shear loading condition is critical to the development of the fracture surfaces since it corresponds to the origin of the surface with a stress triaxiality and lode parameter of zero. Numerous types of in-plane shear tests have been proposed in the literature that are suitable to automotive sheet materials with the butterfly-like specimens becoming popular in recent years. The butterfly shear test involves through-thickness machining of the specimen to create a reduced section where fracture will initiate.
2015-04-14
Journal Article
2015-01-0573
Tau Tyan, Yu-Kan Hu, Dana Sun, Leonard Shaner, Matt Niesluchowski, Nand Kochhar, Guofei Chen, Ming Shi
Motivated by a combination of increasing consumer demand for fuel efficient vehicles, more stringent greenhouse gas and 2025 Corporate Average Fuel Economy (CAFE) standards, automotive manufacturers are working to innovate in all areas of vehicle design to optimize fuel efficiency. In addition to improved aerodynamics, enhanced powertrain technologies and alternative fuel vehicles, reducing vehicle weight by using lighter materials has been identified as one of the most important strategies in future vehicle development. Weight reduction in vehicle components, sub-systems and systems not only reduces the energy needed to overcome inertia forces but also can trigger additional mass reduction elsewhere and enable significant mass reduction in full vehicle levels.
2015-04-14
Journal Article
2015-01-0512
Anthony D. Prescenzi
Abstract Ablation casting is an emerging technology which combines traditional sand molding techniques with rapid cooling due to the use of a water soluble binder. High cooling rates and control of solidification direction allows for exceptional mechanical properties and complex shapes. Through the use of ablation, six different body node castings have been manufactured for the 2016 NSX aluminum space frame. The high mechanical properties allowed these castings to be integrated into the crash structure for energy absorption. Using the traditional casting alloy A356, target mechanical properties were 190 Mpa Yield Strength, 280 Mpa Tensile Strength and 12% min elongation. The high elongation was achieved due to the refined eutectic microstructure produced by high cooling rates. The eutectic microstructure produced by ablation was found to be Level 5 or 6 on the AFS scale. Light weighting could also be achieved when compared to traditional GDC castings.
2015-04-14
Journal Article
2015-01-0514
Sugrib K. Shaha, Frank Czerwinski, Wojciech Kasprzak, Jacob Friedman, Daolun Chen
Abstract The uniaxial compression test was used to assess the influence of strain amount on the behavior of precipitates and texture of the Al-7%Si-1%Cu-0.5%Mg alloy, modified with micro-additions of V, Zr and Ti. As revealed through metallographic examinations, fracturing and re-orientation of the second-phase particles increased with increasing compression strain. However, the intermetallic particles experienced substantially more frequent cracking than the eutectic silicon. The crystallographic texture was measured and correlated with deformation behavior of the alloy. The weak texture of 11<211> and 111<110> components, detected after casting transformed to a mixture of 1<110>, 112<110> and 111<110> components after room-temperature compression deformation. The intensity of the texture components depended on the strain amount. It is concluded that the texture formation in the studied alloy is controlled by the precipitates formed during solidification of the alloy.
2015-03-03
WIP Standard
AMSQQA200/8A
This specification covers the specific requirements for aluminum alloy 6061 bar, rod, shapes, tube, and wire produced by extrusion.
2015-03-02
WIP Standard
AMS6417H
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-03-02
WIP Standard
AMS6419H
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-03-02
WIP Standard
AMS6517A
This specification covers a premium aircraft-quality alloy steel in the form of bars, forgings, and forging stock.
2015-03-02
WIP Standard
AMS6425D
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-03-01
WIP Standard
AMS5397E
This specification covers a corrosion and heat-resistant nickel alloy in the form of investment castings.
2015-02-27
Standard
AMS4323C
This specification covers an aluminum alloy in the form of hand forgings up to 6 inches (152 mm) inclusive, in nominal as-forged thickness and having a cross-sectional area of not more than 156 square inches (1006 cm2) (See 8.6).
2015-02-25
Standard
AMS4634C
This specification covers an aluminum bronze alloy in the form of bars, rods, forgings, and forging stock.
2015-02-24
Standard
AS7253C
This procurement specification covers all metal, self-locking wrenching nuts, plate nuts, shank nuts, and gang channel nuts made of a corrosion and heat resistant nickel-base alloy of the type identified under the Unified Numbering System as UNS N07001.
2015-02-19
Standard
AMS4920F
This specification covers a titanium alloy in the form of forgings, 6.000 inches (152.40 mm) and under in cross-sectional thickness and forging stock of any size.
Viewing 1 to 30 of 10002

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