A new method of determining forming limit diagram for sheet materials by gas blow forming

Mitukiewicz, G.; Anantheshwara, K; Zhou, Guowei; Mishra, Raja K.; Jain, Mukesh

doi:10.1016/j.jmatprotec.2014.06.020

Cited by 32 publications

(7 citation statements)

References 9 publications

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“…Others also determined FLDs at high temperatures by using double layered gas based test methods. For example in [14] the specimen has two slits instead of circular holes to reduce the stress concentration. Another example is [15] where FLDs of a titanium alloy were determined at 970°C under constant strain rate by controlling the gas pressure rate.…”

Section: High Temperature Flds and Characterization Methodsmentioning

confidence: 99%

Development of a high-temperature double-layer bulge test for failure prediction in gas-based hot forming of a high-strength aluminium alloy

Teeuwen

Baru

Tilly

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In order to meet the continuously increasing environmental concerns, automotive lightweight concepts of replacing steels with high strength aluminium alloys are one promising solution. Therefore, complex automotive structural components manufactured with new processes like rapid gas-based hot sheet metal forming can become a key factor from a forming technology point of view. A product and process development phase, which is mainly assisted by numerical simulations, mandates knowledge of the material forming limits under the process conditions. The aim of this work is to determine the FLD of a 6xxx precipitation-hardening aluminium alloy within the solution heat treatment temperature range under gas-based hot forming process conditions. For this purpose, a hydraulic double-layered bulge test, as introduced by Banabic, is used as the basis and a high-temperature test setup as well as a characterization methodology are established. FE simulations are utilized to optimize the specimen geometries aiming at specific strain paths. Experiments are conducted with the optimized specimen geometries and the high-temperature FLD is extracted. The FLD is further used in simulations for process parameter identification for failure-free gas-based hot forming of a laboratory scale benchmark component. Experimental validations showed the reliability of the methodology and the determined FLD for failure prediction in the novel forming process.

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Section: High Temperature Flds and Characterization Methodsmentioning

confidence: 99%

Development of a high-temperature double-layer bulge test for failure prediction in gas-based hot forming of a high-strength aluminium alloy

Teeuwen

Baru

Tilly

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Alireza [20] used the finite element software ABAQUS to simulate the forming process of high-speed blowing molding technology, and proposed an off-line heating cycle plan with the minimum temperature distribution difference and the shortest processing time. Horng-Yu Wu and G. Mitukiewicz [21][22] both proposed the use of high temperature gas in the forming of the blow molding technology, and carried out numerical simulation by using the shortened molding time as an index.…”

Section: Introductionmentioning

confidence: 99%

Study on Manufacture of Production Line and Characteristics of Rice Straw Seedling Trays

Li¹

2021

converter

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As the late processing of rice straw may consume the cost and pollute the environment, this paper put forward a method to use the rice straw, namely, the rice straw is used as the raw material for making seedling trays. The process of seedling tray production was designed, and the method of obtaining raw materials and steps of seedling tray production were introduced. In addition, the overall structure, transmission system and the forming mold of the pneumatic molding machine were also designed and produced. Next, the seedling trays were made by using the production line to analyze the characteristics of the rice straw seedling strays. The study was intended to explore the rules about the influence of moisture content on the characteristics of the seedling strays. As the moisture content of the seedling trays increased, the seedling trays expanded, increasing the volume, density and mass. However, the ultimate tension and shear force borne by the seedling stray decreased along with the increase of moisture content. It could be known from the analysis that: rice straw seedling trays could satisfy the needs of rice nursery. Compared with the traditional plastic seedling tray, the rice straw seedling tray can simplify the production process and provide natural nutrients for rice seedlings.

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“…Min et al (2010) probed the influence of necking types on the left-hand side of the FLD. Likewise, Mitukiewicz et al (2014) addressed the left side of FLD via gas blow forming. Later, Khan and Liu (2012) developed a new empirical criterion which was based on the stress vector criterion.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of forming limit diagrams of 6063 aluminum alloy sheets using Ayada ductile fracture criterion and the second derivative of large strain criterion at increased temperatures

Heidari

Ghassemi

Atrian

2018

Lat. Am. j. solids struct.

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The present study investigated the forming limit diagrams (FLDs) of aluminum alloy 6063 sheets using numerical and experimental methods at increased temperatures. In the numerical section, for the first time, the Ayada ductile fracture criterion and the second derivative of the large strain criterion were used. ABAQUS finite element (FE) analysis software was employed for the simulations. In order to determine necking time, after simulation, relevant data such as stress history, principal stresses, equivalent strain history, and large strain were extracted and the conditions for the necking criteria were investigated. To obtain the FLD in the experimental part, a Nakazima format was used. Experiments were conducted at temperatures of 25, 150, 200 and 250 degrees Celsius for the samples with equal lengths and different widths. Ayada criterion had better compatibility with the left side of the FLD (for small negative strains), while the second derivative of the large strain criterion had better compatibility with the right side of the diagrams (for small positive strains). The results also showed that with the increase in temperature, the FLD moved upward and sheet forming was improved. This improvement was almost similar for the temperatures of 150 and 200ºC, while the processing temperature of 250ºC led to significant improvement in forming, as compared to other temperatures.

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A new method of determining forming limit diagram for sheet materials by gas blow forming

Cited by 32 publications

References 9 publications

Development of a high-temperature double-layer bulge test for failure prediction in gas-based hot forming of a high-strength aluminium alloy

Development of a high-temperature double-layer bulge test for failure prediction in gas-based hot forming of a high-strength aluminium alloy

Study on Manufacture of Production Line and Characteristics of Rice Straw Seedling Trays

Numerical and experimental investigation of forming limit diagrams of 6063 aluminum alloy sheets using Ayada ductile fracture criterion and the second derivative of large strain criterion at increased temperatures

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