A vision-integrated tension test for use in sheet-metal formability studies

Rao, K.P.; Mohan, E.

doi:10.1016/s0924-0136(01)00933-5

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…In spite of its low accuracy at small strains, DIC can be used at large strains and is simple to implement. Although large strains were measured using digital images of grid marks on uniaxial sheet metal specimens by Rao and Mohan [2001], the grid deformation was not used to determine R-values. The authors are not aware of any other investigations that use the DIC method to determine R-values.…”

Section: Introductionmentioning

confidence: 99%

Observations of anisotropy evolution and identification of plastic spin parameters by uniaxial tensile tests

Choi

Walter

Lee

et al. 2006

JOMMS

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Micromechanical effects such as the development of crystallographic texture and of dislocation structures lead to evolution of material anisotropy during plastic deformation. The anisotropy of sheet metals is commonly quantified by its R-values. The R-value is defined as the ratio of the transverse strain to the thickness strain at a certain longitudinal strain, and it changes if the anisotropy changes. Conventional hardening models do not account for the evolution of anisotropy along an arbitrary orientation. Therefore, although R-values are measured from experiments, predictions of hardening behavior based on R-values using conventional hardening models do not reproduce the experiments for arbitrary orientation. The R-value evolution for large strains can be observed in simple uniaxial tension tests by measuring the transverse and longitudinal strains continuously up to large strains. A digital image correlation (DIC) method is introduced as superior to strain gages for measuring large strains. To model the experimental response, a rotational-isotropic-kinematic (RIK) hardening model is investigated. Because of this model's ability to represent the rotational evolution of the anisotropy, it can predict the hardening behavior for non-RD and non-TD directions. Methods to identify the plastic spin and kinematic hardening parameters are also discussed.

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Section: Introductionmentioning

confidence: 99%

Observations of anisotropy evolution and identification of plastic spin parameters by uniaxial tensile tests

Choi

Walter

Lee

et al. 2006

JOMMS

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“…Grain sizes and surface finish may also influence drawability, particularly on low carbon sheet steels [5,11]. Not only does promote excessive surface roughness, coarse grain (> ASTM 5) may also reduce drawability.…”

Section: Flange Wallmentioning

confidence: 99%

“…Either fundamental intrinsic or simulative test can be used to reveal the anisotropy of materials. The procedure of conventional tension testing is usually time-consuming and unreasonable, particularly for thin specimen [6,[10][11][12]. New methods and apparatus have been developed to overcome these problems but not yet applicable [11].…”

Section: Flange Wallmentioning

confidence: 99%

“…The procedure of conventional tension testing is usually time-consuming and unreasonable, particularly for thin specimen [6,[10][11][12]. New methods and apparatus have been developed to overcome these problems but not yet applicable [11]. Simulative tests, on the contrary, are more useful, more relevant, and closer to the production process.…”

Section: Flange Wallmentioning

confidence: 99%

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The Selection of Materials for Roller Chains From the Perspective of Manufacturing Process

Saptono¹

2010

MST

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The selection of materials for an engineering component is not only requested by its design function and shape, but also the sequence through which it is manufactured. The manufacturing operation of roller chains involves drawing and trimming processes aimed at producing semi-finished chain drives component with a well-standardized dimension. In addition to final combination of properties required by design constraints, the ability of materials to be formed into a desired shape and geometry without failure is also critical. The objective of materials selection should therefore involve additional attributes that are not typically accommodated by the standard procedure of materials selection. The present paper deals with the selection of materials for roller chains from the perspective of manufacturing process. Ears and un-uniform wall thickness have been identified as a key problem in the mass production of component. Provided all process parameters were established, the anisotropy factor of materials is critical. Simulative test can be reasonably used to obtain material performance indices that can be added up to the standard procedure of material selection. Of three commercially available steel grades evaluated with regard to the criteria defined, one grade is more suitable for the present objective.

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“…whereε * p is the plastic strain increment of the previous load step andε p is the plastic strain increment of the current loading step. Other approaches where the interaction between kinematic and rotational hardening has been considered are found in [Dafalias 1993;Tsakmakis 2004]. Figure 8.…”

Section: Hardening Modelmentioning

confidence: 99%

Untitled

2006

JOMMS

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We suggest an analytic-numerical approach to solving the problem of vibrations of multilayer cylinders under impulse loading. The behavior of the cylinder is described by dynamic equations of three-dimensional elasticity theory. The number of layers in the pack and the thickness and mechanical characteristics of each layer are selected arbitrarily. The possibilities of the approach are proposed, and the validity of results obtained is demonstrated by numerical examples.

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A vision-integrated tension test for use in sheet-metal formability studies

Cited by 5 publications

References 13 publications

Observations of anisotropy evolution and identification of plastic spin parameters by uniaxial tensile tests

Observations of anisotropy evolution and identification of plastic spin parameters by uniaxial tensile tests

The Selection of Materials for Roller Chains From the Perspective of Manufacturing Process

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