Constitutive modeling and the effects of strain-rate and temperature on the formability of Ti–6Al–4V alloy sheet

Li, Xiaoqiang; Guo, Guiqiang; Xiao, Jun-jie; Song, Nan; Li, Dongsheng

doi:10.1016/j.matdes.2013.09.069

Cited by 71 publications

(26 citation statements)

References 27 publications

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“…As a result, f 0 was used as an adjustable parameter to match the limit strain at plane strain condition with the experimental data in the investigation of Soare, Naka et al and Zhang et al. [34][35][36] Fig. 7 were plotted using n=0.274 and r=0.935 at different initial inhomogeneity factors.…”

Section: Influence Of Pre-strain and Solution Heat Treatment On Formimentioning

confidence: 99%

The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment

Guo

Hongzhi

et al. 2015

Int. J. Precis. Eng. Manuf.

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Al-Cu-Mg aluminum alloy sheet is widely used for aircraft skin. Multi-stage forming combined with Solution Heat Treatment (SHT) is necessary for some geometrically complex productions in aircraft skin components. However, the effects of pre-strain and natural ageing time on the formability of Al-Cu-Mg aluminum alloy sheet are not fully understood. In this study, the deformation responses of an Al-Cu-Mg aluminum alloy sheet, over a range of pre-strain levels (0% to 6%) and natural ageing time levels (0 h to 2 h) were investigated. A modified Hollomon constitutive model coupling with pre-strain and natural ageing time was proposed to characterize the deformation responses of the Al-Cu-Mg aluminum alloy sheet. The hemispherical dome tests were performed at natural ageing time levels ranging from 0.25 h to 1.5 h. Marciniak and Kuczynski (M-K) theory was used to obtain the forming limit prediction model which takes pre-strain and natural ageing time into account. The theoretical Forming Limit Curves (FLCs) were compared with the experimental results.

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Section: Influence Of Pre-strain and Solution Heat Treatment On Formimentioning

confidence: 99%

The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment

Guo

Hongzhi

et al. 2015

Int. J. Precis. Eng. Manuf.

Self Cite

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“…Due to very low capability of plastic strain at the ambient temperature and strong spring-back effect compared to conventional deep drawing steel sheets, obtaining of products made of titanium sheet metal (Gr 5) using conventional methods is limited and requires expert knowledge and non-standardized approach to solving this problem [5][6][7]. Obtaining deep drawn parts with complex geometry from hard-deformed sheet metal requires modification of conventional methods of forming or application of modern technologies such as electromagnetic forming, explosive forming, impulse forming, hydroforming or incremental sheet forming [1][2][3][4][7][8][9][10][11]. It should be remembered that forming titanium alloys at increased temperature necessitates solving the problems of its tendency for reacting with oxygen, nitrogen and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

“…[2,16,17]. In order to evaluate the opportunities for sheet metal forming it is necessary to carry out specific analyses and tests.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations of sheet metal forming allow for predicting the behaviour of sheet metal during individual phases of forming as early as at the stage of process design. Publications in this field focus primarily on mechanical properties, capability of plastic strain, including methods of determination of forming limit diagrams (FLD) with regards for the effect of anisotropy of mechanical properties, strain rate and temperature as well as opportunities for application of modern methods of forming and optimization of parameters of these processes [1,2,[17][18][19][20][21][22]. Authors of the studies [10] point to a very low, almost zero drawability of sheet metal made of titanium Gr 5 at the temperature of environment.…”

Section: Introductionmentioning

confidence: 99%

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Forming Of Spherical Titanium Cups From Circular Blanks With Cutouts On The Perimeter

Lacki¹,

Adamus²,

Więckowski³

et al. 2015

Archives of Metallurgy and Materials

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TŁOCZENIE TYTANOWYCH CZASZ KULISTYCH Z WYKROJÓW OKRĄGŁYCH Z WYCIĘCIAMI NA OBRZEŻUDespite substantial demand for drawn parts made of high-strength sheet metal (including titanium alloys) observed in the modern industry, particularly automotive and aviation, their application remains insignificant. This results from the fact that such sheet metal shows poor plasticity and its cold-forming is almost impossible. Low drawability makes it impossible to obtain even such simple shapes as spherical cups. The authors of this study developed circular sheet-metal blanks with cutouts on their perimeter. The blanks allow for cold forming of spherical cups from Ti6Al4V titanium alloy sheet metal using conventional rigid tools. The cutouts proposed in the study affect plastic strain distribution, which in turn leads to an increase in forming depth by about 30%. The numerical analysis, performed using the PamStamp 2G System software based on finite element method, was verified experimentally.Keywords: sheet-metal forming, titanium sheet, FEM modelling Mimo, iż nowoczesny przemysł, głównie motoryzacyjny i lotniczy, zgłasza zapotrzebowanie na wytłoczki z wysokowytrzymałych blach metalowych, w tym stopów tytanu, ich zastosowanie jest znikome. Wynika to z faktu, że blachy te mają małą plastyczność i ich tłoczenie na zimno jest niemal niemożliwe. Niska tłoczność uniemożliwia kształtowanie nawet tak prostych geometrii jak czasze kuliste. W ramach niniejszej pracy opracowano kołowy wykrój z wycięciami na obwodzie, który umożliwia kształtowanie na zimno kulistych czasz z blachy ze stopu tytanu Ti6Al4V przy użyciu klasycznych, sztywnych narzędzi. Zaproponowane wycięcia wpływają na zmianę rozkładu odkształceń plastycznych, co w konsekwencji prowadzi do zwiększenia głębokości tłoczenia o około 30%. Analizy numeryczne, wykonane programem PamStamp 2G bazującym na metodzie elementów skończonych, zweryfikowano doświadczalnie.

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“…The activation energy of the hot deformation was obtained, and the relationship between the temperature and the deformation was indirectly analyzed. Li et al [4,5], based on the hot compression tests, obtained the hot deformation equation between the temperature and the strain. The trend of the Fu-li Zhang and Yu-cun Zhang contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

The interplay between the measured dimension and temperature of hot large forgings

Zhang

et al. 2015

Int J Adv Manuf Technol

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During the forming process of hot forgings, the dimension and temperature are key parameters for improving the forging technology. In the paper, based on the mathematical physics methods, a mutual relationship model between the measured dimension and the temperature is proposed. This relationship model is displayed by the temperature field model and the dimensional model. Firstly, according to the law of conversation of energy, using the Dirichlet function and the measured dimension, the power-transfer function of heat source is established. Taking the measured temperatures as the boundary conditions, the temperature field model influenced by the dimensional change is established using the method of the moving virtual heat source. Secondly, based on the variation characteristics between the mesoscopic structure and the stress, using the function of the deformation energy is analyzed. Using the differential calculus of the pluralistic function, the dimensional change model influenced by the measured temperature is established. Based on the temperature field model and the dimensional model, this mutual relationship of the two ones can be clearly and directly displayed. Finally, the verifiable experiments and simulations are obtained using the forging experiments and the Deform-3D. Using the contrastive analysis method, the feasibility of the two relationship models is verified and the change trends of the dimension and temperature are analyzed. Combining the parameters of the forging technology in the thermal forming process, the application and the practical significance of the model are further cleared. The mutual relationship model provides a theoretical basis for improving the forging technology.

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Constitutive modeling and the effects of strain-rate and temperature on the formability of Ti–6Al–4V alloy sheet

Cited by 71 publications

References 27 publications

The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment

The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment

Forming Of Spherical Titanium Cups From Circular Blanks With Cutouts On The Perimeter

The interplay between the measured dimension and temperature of hot large forgings

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