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C.J. Van Tyne

Bio: C.J. Van Tyne is an academic researcher from Colorado School of Mines. The author has contributed to research in topics: Forging & Deformation (engineering). The author has an hindex of 23, co-authored 90 publications receiving 1939 citations.


Papers
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TL;DR: In this paper, the authors used regression analysis to determine the correlation of the yield strength and the tensile strength to the diamond pyramid hardness values for over 150 nonaustenitic, hypoeutectoid steels.
Abstract: Hardness values as well as yield and tensile strength values were compiled for over 150 nonaustenitic, hypoeutectoid steels having a wide range of compositions and a variety of microstructures. The microstructures include ferrite, pearlite, martensite, bainite, and complex multiphase structures. The yield strength of the steels ranged from approximately 300 MPa to over 1700 MPa. Tensile strength varied over the range of 450-2350 MPa. Regression analysis was used to determine the correlation of the yield strength and the tensile strength to the diamond pyramid hardness values for these steels. Both the yield strength and tensile strength of the steels exhibited a linear correlation with the hardness over the entire range of strength values. Empirical relationships are provided that enable the estimation of strength from a bulk hardness measurement. A weak effect of strain-hardening potential on the hardness-yield strength relationship was also observed.

701 citations

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TL;DR: In this article, the residual stress distribution after welding and after a post weld heat treatment have been determined by a finite element transient heat flow analysis in conjunction with a coupled thermal-mechanical analysis.

117 citations

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TL;DR: In this paper, the authors focus on the closure of internal voids during open die forging so as to produce a sound component and propose a criterion for void closure during the initial cogging and deformation steps prior to detailed open-die-forging operations.

102 citations

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional rigid-plastic finite element method (FEM) analysis has been performed to optimize an open die forging process in the production of circular shapes (i.e., round bars, spindles, rotors, etc.).

67 citations

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed data in the literature from laboratory experiments on both the shearing process and the characteristics of sheared edges and concluded that deformation in the SAZ is the dominant factor in controlling failure during sheared-edge stretching.
Abstract: Failure in sheared-edge stretching often limits the use of advanced high-strength steel sheets in automotive applications. The present study analyzes data in the literature from laboratory experiments on both the shearing process and the characteristics of sheared edges. Shearing produces a surface with regions of rollover, burnish, fracture, and burr. The effect of clearance and tensile strength on the shear face characteristics is quantified. Higher strength, lower ductility steels exhibit an increase in percent fracture region. The shearing process also creates a zone of deformation adjacent to the shear face called the shear-affected zone (SAZ). From an analysis of data in the literature, it is concluded that deformation in the SAZ is the dominant factor in controlling failure during sheared-edge stretching. The characteristics of the shear face are generally important for failures during sheared-edge stretching only as there is a correlation between the characteristics of the shear face and the characteristics of the SAZ. The effect of the shear burr on shear-edge stretching is also related to a correlation with the characteristics of the SAZ. In reviewing the literature, many shearing variables that could affect sheared-edge stretching limits are not identified or if identified, not quantified. It is likely that some of these variables could affect subsequent sheared-edge stretching limits.

67 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the microstructure and mechanical properties of EBM-built Ti-6Al-4V have been systematically investigated in the presence of columnar prior β grains delineated by wavy grain boundary α and transformed α/β structures.

504 citations

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TL;DR: Wagoner et al. as mentioned in this paper presented a review of recent advances in the field of springback, the elastically driven change of shape of a metal sheet during unloading and following forming.

267 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the Modified Mohr-Coulomb fracture criterion (MMC) to predict the formation of shear-induced fracture in sheet metal forming and showed that the location of fracture as well as the magnitude of punch travel corresponding to first fracture was correctly predicted by MMC fracture criterion for both circular and square punch.

213 citations

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TL;DR: In this article, a detailed review of welding and joining processes applied to NiTi, in similar and dissimilar combinations considering both fusion and solid-state processes, is presented, and a special section is devoted to this technique.

211 citations

Journal ArticleDOI
TL;DR: In this article, a general, general, continuum constitutive model was derived incorporating elastic, plastic, and quasi-plastic-elastic (QPE) deformation for draw-bend springback prediction.

196 citations