The Sensitivity of a Photogrammetric Method in Formability Analysis

Slota, Ján; Jurčišin, Miroslav; Gajdoš, Ivan; Spišák, Emil

doi:10.2478/ama-2013-0021

Cited by 10 publications

(12 citation statements)

References 4 publications

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“…The Argus uses a 12-megapixel camera sensor and is mainly used to measure deformations in the processes of sheet metal forming in order to assess the quality of sheet metal products, or to conduct a comparative analysis of mathematical and physical modelling [ 41 , 42 , 43 ]. When measuring drawpieces, the position of the camera recording the image is changed in at least two planes [ 44 ]. In each camera position, the object relative to the camera is rotated by a specific angle.…”

Section: Methodsmentioning

confidence: 99%

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

et al. 2021

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Stringer-stiffened panels made of aluminium alloys are often used as structural elements in the aircraft industry. The load-carrying capacity of this type of structure cannot relieve the reduction in strength in the event of local buckling. In this paper, a method of fabrication of rib-stiffened panels made of EN AW-2024-T3 Alclad and EN AW-7075-T6 Alclad has been proposed using single point incremental forming. Panels made of sheets of different thickness and with different values of forming parameters were tested under the axial compression test. A digital image correlation (DIC)-based system was used to find the distribution of strain in the panels. The results of the axial compression tests revealed that the panels had two distinct buckling modes: (i) The panels buckled halfway up the panel height towards the rib, without any appreciable loss of rib stability, and (ii) the rib first lost stability at half its height with associated breakage, and then the panel was deflected in the opposite direction to the position of the rib. Different buckling modes can be associated with the character of transverse and longitudinal springback of panels resulting from local interaction of the rotating tool on the surface of the formed ribs.

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Section: Methodsmentioning

confidence: 99%

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

et al. 2021

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“…6. Coming out from assumptions presented in the literature [12] the force F BL we can calculate as follows:…”

Section: Methodsmentioning

confidence: 99%

“…They have found that this system does not provide acceptable accuracy in the measurement of certain areas of the drawpiece, especially those that include internal, small radii. Slota et al [12] tested the sensitivity of the Argus system by using a photo or a video camera to take the pictures, using the anti-reflexive spray and comparing the strains computed by the numerical simulation and ones measured by the Argus system. Authors have observed great sensitivity of different factors on the measured values of strains, such as the time of etching, etching process parameters, type of measuring grid, quality of sheet surface in pre-production phase and type of used camera, application of developer, interpolation parameters, different lighting conditions, angles of the camera view and the number of captured pictures in post-production phase.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of wall thickness change at deep drawing of box-shaped product using flat restriction bars

Hudák

Tomáš

2013

ZN PRz Mechanika

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In the paper the deep-drawing method using flat restriction bars to restrict plastic flow of sheet material at straight parts of drawing die by increasing of resistance to friction between a blankholder, a die and a blank is presented. Mentioned bars provide enough radial stresses in the drawpiece's flange to prevent the excessive material flow into the drawing die. Parameters of the deep drawing process such as the blankholder force and the restriction bars' normal force, given by filling pressure of gas springs were tested and adjusted to deep drawing of a bathtub model. The wall thickness change was measured by the dial gauge and by photogrammetric method using 3D optical system ARGUS. The experiments were done using the cold rolled steel sheet for enameling KOSMALT 240 with thickness of 0.6 mm. The results of measurements of bathtub wall thickness reduction by using both considered methods showed the same tendency, but there is a difference in values of thickness reduction. The measurements based on the non-contact 3D optical system ARGUS gave the lower values of wall thickness reduction at critical areas of the bathtub model equals of 10.6÷11.7%, compared to ones measured by the dial gauge.

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“…Digitizing objects is the main activity in the process of reverse engineering for engineering production. This process is possible due to scanning devices, known as 3D scanners, which enable the conversion of real three-dimensional objects into the digital form [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Surface Analysis and Digitization of Components Manufactured by SLM and ADAM Additive Technologies

Timko¹,

Holubják²,

Bechný³

et al. 2023

Manufacturing Technology

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The presented article focuses on the analysis of the components manufactured by different additive technologies and their reverse digitization. Sintered components were manufactured by Selective Laser Melting (SLM) and Atomic Diffusion Additive Manufacturing (ADAM) technologies. ADAM can be classified as indirect additive production using fibre of metal powder bound in a plastic matrix. SLM method works on the basis of selective bonding of metal powder using the thermal energy of the laser beam. The components were manufactured from anti-corrosion materials 17-4 PH and 316L-0407. In the experiment, parameters such as dimensional and shape accuracy were verified using laser scanning. Next, the roughness of the printed surfaces was measured on an Alicona Infinite Focus 5G optical measuring device. The dimensional accuracy of the ADAM process was evaluated using ISO IT grades. The accuracy of ADAM technology achieves the IT13 grade that is comparable to that of traditional processes for the production of semi-finished metal parts.

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The Sensitivity of a Photogrammetric Method in Formability Analysis

Cited by 10 publications

References 4 publications

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

Comparative study of wall thickness change at deep drawing of box-shaped product using flat restriction bars

Surface Analysis and Digitization of Components Manufactured by SLM and ADAM Additive Technologies

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