Research on Al-alloy sheet forming formability during warm/hot sheet hydroforming based on elliptical warm bulging test

Cai, Gaoshen; Wu, Chuanyu; Gao, Zepu; Lang, Lihui; Alexandrov, Sergei

doi:10.1063/1.5029539

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…The HDD test equipment used was the self-development YRJ-50 machine [6,18,19], by which not only can the stress-strain curve be confirmed and obtained by a warm bulging test [19,20] but also a warm sheet HDD test can be carried out. It consists of a mechanical body, a detecting system, and a control system.…”

Section: Test Equipmentmentioning

confidence: 99%

“…Even though the plasticity of materials can be improved in a warm/hot environment, it will inevitably lead to the deterioration tendency of material properties due to microstructure variation. In addition, when encountering a reduced temperature gradient at an elevated temperature, the microstructure deterioration tendency of metal materials may be inhibited and transformed in a favorable direction [6,7]. From this, the corresponding solution to the microstructure property deterioration of materials can be determined.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Effect of Type of Cooling on the Properties of Aluminum Alloy during Warm/Hot Hydromechanical Deep Drawing

Cai

Zhang

2018

Symmetry

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The warm sheet cylindrical deep drawing experiment of aluminum alloy was carried out and macro-mechanical properties and microstructure evolution of hydro-formed cups with different cooling medium were analyzed, which aimed to investigate the effects of different types of cooling on mechanical properties and microstructure of cylindrical cups hydro-formed by warm Hydro-mechanical Deep Drawing (HDD). Results show that, under the condition of warm hydroforming, the mechanical properties such as yield stress and ultimate strength were influenced very little by air or water cooling. Grain coarsening of these hydro-formed cups can be inhibited to a certain extent with subsequent rapid water cooling. Moreover, it shows that the processing with warm sheet hydroforming and subsequent rapid cooling of 7075-O aluminum alloy has a positive significance in maintaining the stability of macro mechanical properties and inhibiting the degradation of the microstructure of materials.

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Section: Test Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Type of Cooling on the Properties of Aluminum Alloy during Warm/Hot Hydromechanical Deep Drawing

Cai

Zhang

2018

Symmetry

Self Cite

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“…Pandre et al [ 11 ] performed an investigation of processing temperatures (room temperature, 200 °C, and 400 °C) on the forming limit diagram (FLD) of a thin-rolled DP590 sheet. In addition, the warm-forming limits of an aluminum alloy under certain temperature conditions were also found [ 12 , 13 ]. In the above experimental studies on the warm-forming limits of sheet materials, the limit strain was mainly obtained and measured via the grid strain method.…”

Section: Introductionmentioning

confidence: 99%

Development of Measurement Equipment and Experimental and Numerical Simulation Studies for Warm Forming Limits of High-Strength Steel

Liang

Qiu

et al. 2021

Materials

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This paper describes the research and development of a set of measurement equipment for the warm forming limits of high-strength steel based on the Nakazima bulging test method and the digital image correlation method. The equipment could provide an argon shield and a water-cooling atmosphere, as well as two heating options: heating the specimen, dies, and environment to the test temperature simultaneously or heating the specimen to the test temperature at a higher speed than that for the dies and environment. The equipment was applied to measure the forming limit curves for high-strength DP600 steel at room temperature and at the temperature of 300 °C to verify its performance. The DYNAFORM software was then applied for the digital simulation of the bulging test method. A new limit-strain-fitting method was proposed to eliminate the impact of the distorted grid on the digital simulation process. The change trend of the forming limit curve acquired in the test had sound consistency with the test results.

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“…These methods require at least five different sample geometries and punch (hemispherical and flat, respectively) to deform the material. Typical limit of these methods is the friction between the punch and the sample, which may affect the accuracy of the FLC [4].…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Influence of the Laser Heat Treatment on the AA5754-H32 strain path during hydraulic bulge tests

Cusanno¹,

Moturu²,

Carty³

et al. 2021

Esaform 2021

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The hydraulic bulge test represents an effective experimental method to characterise sheet metals since the equivalent strains before failure are much larger than those measured during tensile testing and there is nearly no frictional effect on the results. Recently this test has been proposed not only for extracting data concerning the equi-biaxial strain condition, but to determine the forming limit diagram (FLD) in the range of positive minor strains. In the proposed methodology, different strain paths can be obtained by merely using a test blank having two holes with a suitable geometry and position to be tested, without the need of dies with elliptical apertures. However, a carrier sheet is necessary, thus implying results may be affected by friction effects. This paper proposes a new methodology for the determination of the right side of the Forming Limit Curve (FLC), based on the adoption of local heat treatments aimed at determining different strain paths on the blank to be tested while using the classical circular die for bulge tests. In particular, the formability of the alloy AA5754-H32 was investigated; 3D Finite Element simulations were conducted setting different laser strategies and monitoring the resulting strain path. Results revealed that the proposed methodology supports obtaining many additional points in the right side of the FLC, thus being effective and friction free.

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Research on Al-alloy sheet forming formability during warm/hot sheet hydroforming based on elliptical warm bulging test

Cited by 12 publications

References 25 publications

Investigation on the Effect of Type of Cooling on the Properties of Aluminum Alloy during Warm/Hot Hydromechanical Deep Drawing

Investigation on the Effect of Type of Cooling on the Properties of Aluminum Alloy during Warm/Hot Hydromechanical Deep Drawing

Development of Measurement Equipment and Experimental and Numerical Simulation Studies for Warm Forming Limits of High-Strength Steel

Influence of the Laser Heat Treatment on the AA5754-H32 strain path during hydraulic bulge tests

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