Journal ArticleDOI
Formability of AA3003 brazing sheet at elevated temperatures: limiting dome height experiments and determination of forming limit diagrams
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TLDR
In this article, a digital image correlation (DIC) system was used to perform in situ strain measurement on AA3003 brazing sheet and formability experiments were conducted.Abstract:
Warm forming has some important advantages, the most significant being that forming limit strains increase at elevated temperatures. To quantify this advantage for an AA3003 brazing sheet, forming limit diagrams were determined using warm tooling developed to perform limiting dome height (LDH) experiments together with a digital image correlation (DIC) system used to perform in situ strain measurement. Forming limit curves (FLCs) were developed at several temperature levels and strain-rates. The formability experiments demonstrated that while temperature has a significant effect on formability, forming speed has a mild effect within the studied range. Elevating the temperature to 250 °C improved the formability more than 200 % compared to room temperature forming while forming at lower speeds increased the limiting strains by 10 % and 17 % at room temperature and 250 °C, respectively. A comparison between FLDs developed using DIC methods versus circle grid (CG) analysis showed good agreement between the two methods; however, the degree of scatter in the CG method increased significantly for the higher temperature tests.read more
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Experimental fracture characterisation of an anisotropic magnesium alloy sheet in proportional and non-proportional loading conditions
TL;DR: In this paper, a comprehensive experimental investigation was performed to characterize the fracture behavior of a rare-earth magnesium alloy sheet, ZEK100-O, under both proportional and non-proportional loading conditions.
Journal ArticleDOI
Advances in anisotropy of plastic behaviour and formability of sheet metals
TL;DR: A review of the most recent models for description of the anisotropic plastic behavior and formability of sheet metals is presented in this article, where the experimental methods and theoretical models used for measuring and predicting the limit strains, development of new tests for determining the Forming Limit Curves (FLC), as well as on studying the influence of various material or process parameters on the limit strain.
Journal ArticleDOI
Elevated temperature constitutive behavior and simulation of warm forming of AZ31B
TL;DR: In this article, an evolving anisotropic/asymmetric continuum level material model based on a CPB-type yield function was used to fit the material behavior at different temperatures.
Journal ArticleDOI
Characterization of heat transfer coefficient for non-isothermal elevated temperature forming of metal alloys
TL;DR: In this article, an experimental methodology is proposed to obtain heat transfer coefficient (HTC) data for a high strength steel alloys (Usibor® 1500 A-S), seven aluminum alloys, and two magnesium alloys.
Journal ArticleDOI
Sagging resistance of warm formed aluminum brazing sheet
TL;DR: In this paper, the sagging distance as a function of strain for sheets strained at 150°C was similar to that of RT strained samples, while the Sagging distances were larger at all levels of applied strain for sheet strained at 200°C and 250°C.
References
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Journal ArticleDOI
Applications of digital-image-correlation techniques to experimental mechanics
Journal ArticleDOI
Digital Imaging Techniques In Experimental Stress Analysis
W. H. Peters,W. F. Ranson +1 more
TL;DR: In this paper, the surface displacement components in laser speckle metrology were measured using a digital image scanner interfaced to a computer. Butt et al. used a boundary integral equation method to calculate surface traction in the contour.
Proceedings ArticleDOI
Application of Strain Analysis to Sheet Metal Forming Problems in the Press Shop
Journal ArticleDOI
Accurate measurement of three-dimensional deformations in deformable and rigid bodies using computer vision
TL;DR: Results indicate that the three-dimensional measurement methodology, when combined with two-dimensional digital correlation for subpixel accuracy, is a viable tool for the accurate measurement of surface displacements and strains.