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Viewing 1 to 30 of 18864
2016-05-17
Event
2016-04-14
Event
This session will feature the latest developments in sheet metal forming technology. We seek contributions in the general areas of forming processes, formability issues and modeling. Topics of particular interest include: • Forming Processes: Stamping, hydroforming, gas forming, high temperature forming, etc. • Formability Issues: Springback, edge cracking, stretch-bend failures and fracture. • Modeling: Material models, forming limits, failure criteria in various deformation modes and process modeling & optimization.
2016-04-14
Event
This session will feature the latest developments in sheet metal forming technology. We seek contributions in the general areas of forming processes, formability issues and modeling. Topics of particular interest include: • Forming Processes: Stamping, hydroforming, gas forming, high temperature forming, etc. • Formability Issues: Springback, edge cracking, stretch-bend failures and fracture. • Modeling: Material models, forming limits, failure criteria in various deformation modes and process modeling & optimization.
2016-04-13
Event
This symposium provides a forum for researchers and application engineers to disseminate the knowledge and information gained in the area of advanced high-strength and press-hardening steel development and applications in automotive structures, enabling light-weight and durable vehicles with improved safety.
2016-04-13
Event
This symposium provides a forum for researchers and application engineers to disseminate the knowledge and information gained in the area of advanced high-strength and press-hardening steel development and applications in automotive structures, enabling light-weight and durable vehicles with improved safety.
2016-04-05
Technical Paper
2016-01-0421
Bingxu Wang, Gary Barber, Minsheng He, Xichen Sun, Michael Shaw, Ben Slattery, Phil Seaton
Abstract: This research studies the transformation kinetics of austempered ductile iron (ADI) with and without nickel as the main alloying element. ADI has improved mechanical properties compared to ductile iron due to its ausferrite microstructure. Not only can austempered ductile iron be produced with high strength, high toughness and high wear resistance, the ductility of ADI can also be increased due to high carbon content austenite. Many factors influence the transformation of phases in ADI. In the present work, the addition of nickel was investigated based on transformation kinetics and metallography observation. The transformation fractions were determined by Rockwell hardness variations of ADI specimens. The calculation of transformation kinetics and activation energy using the “Avrami Equation” and “Arrhenius Equation” is done to describe effects of nickel alloy for phase reactions.
2016-04-05
Technical Paper
2016-01-0355
Takashi Iwama
Dent resistance and surface distortion were deteriorated by reduction of outer panel thickness. While aluminum or resin use for outer panel are increasing, it is not spread in the car of cost low price, steel is used. However, even in vehicles of lower price it has been required weight reduction of body, weight reduction has become necessary with steel using. Therefore, it becomes difficult to reduce automotive body weight. To investigate the weight reduction potential with steel using, effective factors on surface distortion and dent resistance properties were evaluated quantitatively with the aim of securing these properties. Materials used for experiment were tensile strength(TS) 340 MPa grade bake hardenable (BH) steel sheet, which is often used in the door outer and TS 440 MPa grade BH steel sheet for outer panel which developed by JFE Steel.
2016-04-05
Technical Paper
2016-01-0104
Khalil Maalouf, David Stull, Keith Nicholas
In copper wire, real time crimp monitoring has traditionally been based on force measurement during the crimp cycle. The force attributed to molding the copper wire into the terminal is a significant portion of the total force needed to form the crimp. Therefore, any wire deviations from the norm is translated into a force pattern aberration that can be detected using basic signal pattern analysis. As the industry is contemplating replacing copper wire with aluminum wire, in order to save on weight and material cost, the traditional force monitoring becomes ineffective in detecting wire faults in the crimp. The reason is that aluminum is a softer material than copper, and most of the force exerted during the crimp cycle is consumed by forming the copper terminal itself. The small force deviation due to aluminum wire fault becomes much more difficult to detect. Therefore, a new technique is needed to monitor crimped aluminum wires.
2016-04-05
Technical Paper
2016-01-0380
Ghassan Abed, Yung-Li Lee, Jian Zhu
Two popular critical plane models developed by Fatemi-Socie and Smith-Watson-Topper were derived from the experimental observations of the nucleation and growth of cracks during loading. The Fatemi-Socie critical plane model is applicable for the life prediction of materials for which the dominant failure mechanism is shear crack nucleation and growth, while the Smith-Watson-Topper model, for materials that fail predominantly by crack growth on planes perpendicular to the planes of maximum tensile strain or stress. The two critical plane models have been validated primarily by in-phase and 90° out-of-phase loading, and few, on the complex, non-proportional loading paths. A successful critical plane model should be able to predict both the fatigue life and the dominant failure planes. However, some experimental studies indicate the 304 stainless steel has the two possible failure modes, shear and tensile failure dominant, depending on the loading mode and stress and strain states.
2016-04-05
Technical Paper
2016-01-0946
Jonas Jansson, Soran Shwan, Magnus Skoglundh
Emissions of NOx from heavy duty diesel engines are subject to more stringent environmental legislation. SCR with metal ion exchanged zeolites is a well known method to reduce NOx from heavy duty diesel engines. Understanding durability of these SCR systems is crucial for correct design of the SCR system. In the present paper, thermal and chemical ageing of Fe-BEA as NH3-SCR catalyst is studied. Experimental results of hydrothermal ageing and chemical ageing due to phosphorus and potassium exposure are presented. The catalyst has been characterized by flow reactor experiments, DRIFTS, and XPS. Based on the experimental results a model is proposed to explain the activity and deactivation seen over Fe-BEA. A multi-site kinetic model is developed to predict the deactivation. The kinetic model can predict deactivation well by decreasing the number of active sites in the model representing loss of active iron sites due to migration or chemical blockage of sites.
2016-04-05
Technical Paper
2016-01-0828
Ahmed A. Abdel-Rehim, Sayed Y. Akl
In the present study, the enhancement of an engine performance and emission characteristics by the addition of nanoparticles to the fuel is presented. In this regard, Aluminum Oxide (Al2O3) Nanoparticles were utilized as fuel additive in a single cylinder, direct injection four stroke diesel engine. Two percentages of 0.1and 0.5% by weight of Al2O3 were tested and compared to regular diesel fuel. The results showed that nano-sized aluminum oxide can improve the performance of diesel engines and reduce the emission of pollutants like CO2 and HC compared to conventional diesel fuel. Furthermore, the results indicated that the nano-fuel with nanoparticle concentration of 0.5 % gives better performance characteristics in comparison with that of 0.1 %. However, the only downside of the nanoparticle addition was the increase in the CO emissions.
2016-04-05
Technical Paper
2016-01-0358
Saeid Nasheralahkami, Sergey Golovashchenko, Kaicen Pan, Lindsay Brown, Bindiya Gugnani
In recent years, implementation of advanced high strength steels (AHSS) such as dual phase steels (DP) are increasing in automotive components due to their superior structural performance and vehicle weight reduction capabilities. However, these materials are often sensitive to trimmed edge cracking if stretching along sheared edge occurs in such processes as stretch flanging. Tool wear is another major issue in the trimming of AHSS because of higher contact pressures at the interface between the cutting edges of the trimming die and sheet metal blank defined by AHSS higher flow stresses. Another reason for tool wear is presence of martensitic particles on the surface of the blank. The objective of the present paper is to study the influence of trimming conditions and tool wear on quality and stretchability of trimmed edge of DP980 steel sheet.
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