Investigating the design and process parameters of folded perforated sheet metal

Ablat, Muhammad Ali; Qattawi, Ala

doi:10.1007/s00170-018-3149-5

Cited by 14 publications

(8 citation statements)

References 70 publications

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“…MD can take various forms and shapes and can be fabricated by various means such as progressive stamping, laser, or waterjet cutting. Many researchers proposed different types of MD entities [6][7][8][9]. Figure 1 demonstrates twelve possible MD topologies that are applied on sheet metal.…”

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

“…The results showed that MDs reduced bending force requirement and that MDs reduced springback after bending. Further, Ablat and Qattawi [8] conceptualized OSM bending process. They studied associated parameters to the OSM bending process and design of MDs.…”

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

“…The kerf and other parameters on an OSM sheet are illustrated in Figure 3. The previous work [8] concluded that the k/t ratio of the MD is critical for achieving successful bending without fracture. It was shown that the stress magnitude in the OSM bending is affected by the k/t ratio of MD, where a larger k/t ratio is recommenced to have a lower magnitude of stress in the OSM bending.…”

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

“…Hence smaller k/t ratio results in a higher magnitude of stress, which can cause fracture and tear during the bending process. For instance, the smallest k/t ratio investigated in [8] was 0.2, which is 0.32 mm on a 1.6 mm thick sheet of Aluminum-2036-T4. The Von-Mises stress magnitude generated on MD-2 type (see Figure 1) is 12.4% higher on a 0.2 k/t ratio compared to a k/t ratio of 0.3.…”

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

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Investigating fracture failure in origami-based sheet metal bending

Ablat

Alafaghani

Sun

et al. 2022

Int J Adv Manuf Technol

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Origami-based sheet metal (OSM) bending is a promising new die-free folding technique for sheet metal. OSM bending principle is based on deforming the material along a pre-defined fold line, which is determined using material discontinuity (MD) produced by laser or waterjet cutting. The objective of this work is to study and evaluate the fracture in OSM bending under the influence of various MD types, kerfto-thickness (k/t) ratios, and sheet thicknesses. The research goal is to provide information on selecting an optimized k/t ratio and type of MD that allows for fracture-free bending. Four different ductile fracture criteria (DFC) are used and calibrated from experimental data to forecast fracture. The DFC calibration is used to produce a set of critical damage values (CDV) for assessing the possibility of fracture in the OSM bending. In addition, the study provides fracture evaluation using finite element analysis (FEA) integrated with experimental cases for a broader range of OSM bending parameters and MDs. The results demonstrated that an MD with a higher k/t ratio is less likely to fracture during the OSM bending, whereas a higher sheet thickness increases the possibility of fracture. Furthermore, the study identifies the k/t ratio limit that ensures successful bending without fracture and categorizes MD types into two groups based on fracture likelihood. The fracture in the first group is dependent on the limiting k/t ratio, whereas the possibility of fracture in the second group is independent of the k/t ratio due to its topology.

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Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

Section: Introduction 11 Origami-based Sheet Metal Bendingmentioning

confidence: 99%

See 2 more Smart Citations

Investigating fracture failure in origami-based sheet metal bending

Ablat

Alafaghani

Sun

et al. 2022

Int J Adv Manuf Technol

Self Cite

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“…Figure 1 Various MD patterns proposed in the literature [6][7][8][9] Figure 2 OSM bending configuration. Inset image shows the top view of sheet metal [7][8][9] Another direction of research in the OSM bending has been replacing conventional manufacturing approaches and reducing assembly time compared to traditional manufacturing processes where structures are constructed by welding multiple components. The objective of the studies in this direction is to achieve die-free forming with lower manufacturing energy requirements.…”

mentioning

confidence: 99%

Investigating Fracture Failure in Origami-based Sheet Metal Bending

Ablat

Alafaghani

Sun

et al. 2021

Preprint

Self Cite

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Origami-based sheet metal (OSM) bending is a promising new die-free folding technique for sheet metal. OSM bending principle is based on deforming the material along a pre-defined fold line, which is determined using material discontinuity (MD) produced by laser or waterjet cutting. The objective of this work is to study and evaluate the fracture in OSM bending under the influence of various MD types, kerf-to-thickness (k/t) ratios, and sheet thicknesses. The research goal is to provide information on selecting an optimized k/t ratio and type of MD that allows for fracture-free bending. Four different ductile fracture criteria (DFC) are used and calibrated from experimental data to forecast fracture. The DFC calibration is used to produce a set of critical damage values (CDV) for assessing the possibility of fracture in the OSM bending. In addition, the study provides fracture evaluation using finite element analysis (FEA) integrated with experimental cases for a broader range of OSM bending parameters and MDs. The results demonstrated that an MD with a higher k/t ratio is less likely to fracture during the OSM bending, whereas a higher sheet thickness increases the possibility of fracture. Furthermore, the study identifies the k/t ratio limit that ensures successful bending without fracture and categorizes MD types into two groups based on fracture likelihood. The fracture in the first group is dependent on the limiting k/t ratio, whereas the possibility of fracture in the second group is independent of the k/t ratio due to its topology.

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Curved surface form-finding with self-shaping perforated plates

Bahremandi-Tolou,

Wang,

Gattas

et al. 2024

ARIN

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Self-shaping systems offer a promising approach for making complex 3D geometries from the material-driven transformation of 2D sheets. However, current research development of such systems is focused on small-scale applications. This study proposes a self-shaping composite for generation of larger-scale curved surfaces suitable for spatial structures. The composite arises from the novel combination of a perforated plate passive layer and a heat-shrinkable active layer. Experimental investigations are undertaken to assess the influence of perforation parameters of the passive layer over the degree of curvature generated in the self-shaping composite system. A 3D scanner and parametric curvature evaluation tool were used to extract and analyse the fabricated surface curvatures. Three key deformation characteristics were identified: the generated surface is cylindrical with dominant curvature in the x-direction; curvature is approximately uniform across the surface width and length; and curvature is strongly influenced by perforation bridge and strap length parameters. Results of this study support the application of self-shaping curved surfaces for customizable discrete structure parts.

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Investigating the design and process parameters of folded perforated sheet metal

Cited by 14 publications

References 70 publications

Investigating fracture failure in origami-based sheet metal bending

Investigating fracture failure in origami-based sheet metal bending

Investigating Fracture Failure in Origami-based Sheet Metal Bending

Curved surface form-finding with self-shaping perforated plates

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