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Taylan Altan

Bio: Taylan Altan is an academic researcher from Ohio State University. The author has contributed to research in topics: Forging & Finite element method. The author has an hindex of 59, co-authored 270 publications receiving 14494 citations. Previous affiliations of Taylan Altan include University College of Engineering & DuPont.


Papers
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Journal ArticleDOI
TL;DR: A detailed classification of massive forming processes is given and using impression die forging as an example, the significant process variables and their interactions are systematically discussed in this paper, which illustrates the application of the systems approach to modeling of forging, a massive forming process.
Abstract: This paper reviews the application of systems approach to massive forming processes. A detailed classification of massive forming processes is given and using impression die forging as an example, the significant process variables and their interactions are systematically discussed. The paper also gives an example in forging, which illustrates the application of the systems approach to modeling of forging, a massive forming process. Finally, the future potential, capabilities and shortcomings of process modeling are discussed and recommendations for future work are made. It is expected that the paper can be useful to the metalforming engineer, active in research or production, who is interested in systematic analysis and design of massive forming processes.

1 citations

01 Jan 1996
TL;DR: In this paper, the causes of fatigue failure in cold forging tooling and a fatigue analysis concept that can be applied during process and tool design to estimate the tool life of a layout is presented.
Abstract: This paper discusses the causes of fatigue failure in cold forging tooling and presents a fatigue analysis concept that can be applied during process and tool design to estimate the tool life of a layout The concept has been evaluated using the tool life experiments conducted at the Institute for Metal Forming at the University of Stuttgart The tool life predictions compare favourably with the tool life experienced in the experiments The new concept consists of a Finite Element (FE) based process simulation with extraction of local contact stresses at the tool-workpiece interface, an elastic-plastic stress-strain analysis with calculation of the total strain amplitude and a final damage analysis with prediction of the tool life

1 citations

01 Jul 1983
TL;DR: In this paper, the authors summarized the findings of a study on the potential use of a large press, larger than 59kt, for manufacturing components of the present and future Army Systems.
Abstract: : This report summarizes the findings of a study on the potential use of a large press, larger than 59kt, for manufacturing components of the present and future Army Systems. Specifically, the report covers: The technical background on and present status of large press forging technology; The summary and highlights of visits made throughout this study; Other contacts and information sources utilized in the study; Example parts that can be considered for forming/forging in large presses; and Potential use of flexible tooling to form armor plate.

1 citations

Journal ArticleDOI
TL;DR: In this article, the authors discuss practical determination of material properties and selection of lubricants for forming AHSS using a die set, designed for deep drawing, in a 300 ton servo press.
Abstract: Production of light weight and crash resistant vehicles require extensive use of AHSS (DP,TRIP,TWIP) and Al alloys to form complex shapes. This paper discusses practical determination of material properties and selection of lubricants for forming AHSS using a die set, designed for deep drawing. Tests were conducted in a 300 ton servo press. Thinning at the critical area of the formed part were measured and compared with FE simulation. Prediction of temperatures in deep drawing of selected DP steels and Al alloys in servo press is also discussed.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a Lagrangian finite element method of fracture and fragmentation in brittle materials is developed, where a cohesive-law fracture model is used to propagate multiple cracks along arbitrary paths.

1,970 citations

Journal ArticleDOI
TL;DR: Electrical discharge machining (EDM) has been continuously evolving from a mere tool and die making process to a micro-scale application machining alternative attracting a significant amount of research interests as mentioned in this paper.
Abstract: Electrical discharge machining (EDM) is a well-established machining option for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining processes. The non-contact machining technique has been continuously evolving from a mere tool and die making process to a micro-scale application machining alternative attracting a significant amount of research interests. In recent years, EDM researchers have explored a number of ways to improve the sparking efficiency including some unique experimental concepts that depart from the EDM traditional sparking phenomenon. Despite a range of different approaches, this new research shares the same objectives of achieving more efficient metal removal coupled with a reduction in tool wear and improved surface quality. This paper reviews the research work carried out from the inception to the development of die-sinking EDM within the past decade. It reports on the EDM research relating to improving performance measures, optimising the process variables, monitoring and control the sparking process, simplifying the electrode design and manufacture. A range of EDM applications are highlighted together with the development of hybrid machining processes. The final part of the paper discusses these developments and outlines the trends for future EDM research.

1,421 citations

Book
09 Mar 1989
TL;DR: In this paper, the finite element method was used to analyze the metal forming process and its properties, including plasticity, viscoplasticity, and plane-strain problems.
Abstract: Introduction Metal forming process Analysis and technology in metal forming Plasticity and viscoplasticity Methods of analysis The finite element method (1) The finite element method (2) Plane-strain problems Axisymmetric isothermal forging Steady state processes of extrusion and drawing Sheet metal forming Thermo-viscoplastic analysis Compaction and forging of porous metals Three dimensional problems Preform design in metal forming Solid formulation, comparison of two formulations, and concluding remarks Index.

1,226 citations

Journal ArticleDOI
TL;DR: In this article, the boundary layer flow induced in a nanofluid due to a linearly stretching sheet is studied numerically and the transport equations include the effects of Brownian motion and thermophoresis.

1,086 citations

Journal ArticleDOI
TL;DR: In this paper, the authors give an account of the development of the idea of yield stress for solids, soft solids and structured liquids from the beginning of this century to the present time.
Abstract: An account is given of the development of the idea of a yield stress for solids, soft solids and structured liquids from the beginning of this century to the present time. Originally, it was accepted that the yield stress of a solid was essentially the point at which, when the applied stress was increased, the deforming solid first began to show liquid-like behaviour, i.e. continual deformation. In the same way, the yield stress of a structured liquid was originally seen as the point at which, when decreasing the applied stress, solid-like behaviour was first noticed, i.e. no continual deformation. However as time went on, and experimental capabilities increased, it became clear, first for solids and lately for soft solids and structured liquids, that although there is usually a small range of stress over which the mechanical properties change dramatically (an apparent yield stress), these materials nevertheless show slow but continual steady deformation when stressed for a long time below this level, having shown an initial linear elastic response to the applied stress. At the lowest stresses, this creep behaviour for solids, soft solids and structured liquids can be described by a Newtonian-plateau viscosity. As the stress is increased the flow behaviour usually changes into a power-law dependence of steady-state shear rate on shear stress. For structured liquids and soft solids, this behaviour generally gives way to Newtonian behaviour at the highest stresses. For structured liquids this transition from very high (creep) viscosity (>106 Pa.s) to mobile liquid (

950 citations