Application of warm forming aluminum alloy parts for automotive body based on impact

Sun, Hongtu; Wang, J.; Shen, Guozhe; Hu, Ping

doi:10.1007/s12239-013-0065-4

Cited by 29 publications

(7 citation statements)

References 9 publications

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“…In table 5 the parameters of Johnson-Cook damage model are presented, obtained from the identification procedure and using uniaxial tensile and simple shear test. The obtained parameters are similar to those identified by Sun et al [16], also for AA5182-O. …”

Section: Damage Parameter Identificationsupporting

confidence: 89%

Evaluation of ductile failure models in Sheet Metal Forming

et al. 2016

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Abstract. Traditionally, combination of equivalent plastic strain and stress triaxiality parameters are taken into account when performing characterization of material ductility. Some well-established models like Lemaitre model, GTN based models and many others perform relatively well at high-triaxiality stress states but fail to give adequate answers to low-triaxiality states. In this work, three damage models are presented, applied and assessed to a crossshaped component. Concerning material, AA5182-O, corresponding damage parameters are characterized by an inverse analysis procedure for each damage model.

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Section: Damage Parameter Identificationsupporting

confidence: 89%

Evaluation of ductile failure models in Sheet Metal Forming

et al. 2016

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“…Warm forming simulations of body parts of an automobile using AA5182 alloy showed better energy absorption and satisfactory intrusion displacement of the vehicle body during impact loading when compared to parts made of steel. 17 Several studies showed decreased springback when deformed in warm working temperature range. Keum and Han 18 measured the springback of AA1050 and AA5052 aluminum alloys in bending and draw bending tests at different temperatures and observed decrease in springback when formed at temperatures above 150 °C when compared to bending at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and punch speed on forming limit strains of AA5182 alloy in warm forming and improvement in failure prediction in finite element analysis

Satish

Kumar

Merklein

2017

The Journal of Strain Analysis for Engineering Design

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Formability of AA5182-O aluminum alloy sheets in the warm working temperature range has been studied. Forming limit strains of sheets of two different thicknesses have been determined experimentally in different modes of deformation (biaxial tension, plane strain and tension-compression) by varying temperature and punch speed. A correlation has been established for plane strain intercept of the forming limit diagram (FLD 0) with temperature, punch speed and thickness from the experimental results. This correlation has been used to plot the forming limit diagrams for failure prediction in the finite element analysis of warm deep drawing of cylindrical cups. The effect of strain and strain rate on material flow behavior has been incorporated using a strain rate-sensitive power hardening law in which the strain hardening exponent and strain rate sensitivity index have been experimentally determined. The predictions from simulations have been validated by warm deep drawing experiments. Large improvement in accuracy of failure prediction has been observed using the FLDs plotted based on the developed correlation when compared to the existing method of calculating FLD 0 using only strain hardening coefficient and thickness. The results clearly indicate the importance of incorporating temperature and punch speed in failure prediction of Al alloys using FLDs in the warm working temperature range.

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“…Sun et al (2013) verified the feasibility of using warm forming aluminum alloy parts to improve the energy absorbing performance of vehicle in crash. They compared the difference among using warm forming aluminum alloy, mild aluminum alloy, and mild steel as the material of the front body parts in the frontal impact simulation of a light car.…”

Section: Introductionmentioning

confidence: 74%

Finite element based improvement of a light truck design to optimize crashworthiness

Chen

Wang

et al. 2015

Int.J Automot. Technol.

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Occupant protection of vehicle cab is required for all the commercial vehicles. According to ECE R29-03 amendments, the simulation methods of the front pillar impact test and the side 20 o pendulum impact of the roof strength test for a light truck with a gross mass not exceeding 7.5t are proposed. In this study, a reliable finite element model of a light truck is built by using its CAD model. The finite element model is verified against cab modal test and frontal impact test. Then two crash tests are simulated to evaluate the survival space by examining the contact between the deformed cab and a prescribed manikin model. In the front pillar impact test, the deformed cab is predicted to contact with the manikin. In the roof strength test, the minimum distance between the deformed cab and the manikin is predicted to be 75.3 mm, which does not satisfy requirements either. To enhance the crashworthiness of the truck, some structural improvements are designed such as filling structural foam in the A-pillars and the side panels, adding a roof crossbeam, and reinforcing the rear wall of cab. The simulation results of the improved cab structure show that the cab stiffness is improved, the energy absorption is more homogeneous and there is no penetration into the survival space.

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Application of warm forming aluminum alloy parts for automotive body based on impact

Cited by 29 publications

References 9 publications

Evaluation of ductile failure models in Sheet Metal Forming

Evaluation of ductile failure models in Sheet Metal Forming

Effect of temperature and punch speed on forming limit strains of AA5182 alloy in warm forming and improvement in failure prediction in finite element analysis

Finite element based improvement of a light truck design to optimize crashworthiness

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