Analysis of microbending of CuZn37 brass foils based on strain gradient hardening models

Li, H.; Dong, Xinxin; Yu, Shuhui; Zhou, Rui; Diehl, A.; Hagenah, Hinnerk; Engel, Ulf; Merklein, Marion; Cao, Jian

doi:10.1016/j.jmatprotec.2011.10.007

Cited by 33 publications

(20 citation statements)

References 15 publications

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“…9 shows the comparison of the calculated and the experimental true stress-strain curves which were obtained under the condition of specimens' T/D>1. A good agreement between the calculations and experiments [23] illustrates that the developed constitutive model is capable to predict the relationship between stress and strain when the value of materials' thickness/average grain size is less than 1 which can be often seen in microforming. …”

Section: The Two Sectors Andmentioning

confidence: 52%

Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil

Fang

Jiang

Wang

et al. 2015

Int J Adv Manuf Technol

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X. (2015). Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil. International Journal of Advanced Manufacturing Technology, 79 (9-12), 1905Technology, 79 (9-12), -1914 Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil AbstractSize effects play a significant role in microforming process, and any dimensional change can have a great impact on materials' mechanical properties. In this paper, the size effects on deformation behaviour and fracture of phosphor foil were investigated in the form of grain size effect: the ratio of materials' thickness (T) to average grain size (D) by micro tensile tests. The ratio was designed to be closed to but larger than, less than and equal to 1, respectively. The results show that the amount of plastic deformation decreases with the decrease of the ratio of T/D, which indicates that the grain size plays a significant role and grain deformation modes differ when the ratio changes. It is also found that their fractograph reflects different features in terms of micro-dimples and cleavage planes, further demonstrating that when T/D >1, its materials have a tendency to fracture ductilely, while materials would like to conduct brittle fracture when T/D Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil Abstract: In this paper, the size effects on deformation behaviour and fracture of phosphor foil were investigated in terms of the ratio of materials' thickness (T) to average grain size (D) by micro tensile tests. The results show that the amount of plastic deformation decrease with the decrease of the ratio of T/D, which indicates that the grain size plays a significant role and grain deformation modes differ when the ratio changes. It is also found that their fractograph reflect different features in terms of micro-dimples and cleavage planes, further demonstrating that when T/D>1, its materials have a tendency to fracture ductilely, while materials would like to conduct brittle fracture when T/D<1. So the ratio of T/D which is close to 1 can be regards as the divide of ductile fracture and brittle fracture. For T/D<1, a new constitutive model is proposed based on the classic composite model. The model's results are compared with the experimental ones and the efficiency of the developed models is verified.

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Section: The Two Sectors Andmentioning

confidence: 52%

Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil

Fang

Jiang

Wang

et al. 2015

Int J Adv Manuf Technol

View full text Add to dashboard Cite

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“…This indicates that the grain size effect obviously affects the flow stress of this kind of material. In addition, some prior researches also verified the grain size effect in the copper [25], C2680 brass [23], CuZn37 brass [19], Fe [26], et al…”

Section: Effect Of Grain Size On Materials Propertiesmentioning

confidence: 91%

“…2(b). Li et al [19] have also observed the similar tendency in tensile tests of CuZn37 brass foils with thickness ranging from 25 m to 200 m. The "thinner is stronger" size effect is most likely simultaneously influenced by both the great inhomogeneous deformation and the high strain gradient [19,20]. When the thickness of metal foils decreases to only one or several grains across the thickness direction, anisotropic properties of every single grain become significant to the deformation behavior and lead to the inhomogeneous deformation.…”

Section: Effect Of Thickness On Materials Propertiesmentioning

confidence: 99%

Influence of size effects on material properties and springback behavior of metal foils in micro bending: A review

Liu

Zhao

Qin

et al. 2015

MATEC Web of Conferences

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Abstract. With product miniaturization, the requirement on good forming quality and high dimensional accuracy of micro parts is increasing dramatically. In micro bending process, the springback, a critical factor for the accuracy of micro-bent parts, is significantly affected by size effects. In view of the strong influence of material properties on springback behavior, this paper first reviews the influences of three size-dependent factors on material properties, including foil thickness, grain size and thickness to grain size ratio. Afterwards, the review on the influences of these factors on springback behavior are presented, aiming at enhancing the understanding of relevant size effects and proposing a quantitative analysis approach to evaluate the dimensional accuracy of micro-bent parts.

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“…The plastic deformation causes the increasing of material hardness which the highest value was indicated near the neutral axis [9,10]. The grain properties distribution in the forming area induces a significant influence on the springback behavior.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Investigation of Micro-V-Bending

2017

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Abstract. Bending in sheet metal forming is defined as uniformly straining process around a linear axis. A V-bending process is normally used in sheet metal working due to the tool and process simplicity. The main problem in bending process is a springback occurrence which causes an error in part dimension. In a micro level, the springback angle is difficult to be assessed because of the influence of size effects in all aspects of the system. The springback behavior has been investigated in many previous kinds of research. However, the springback correction is still needed to be studied extensively so that it can be implemented reliably in micro-bending. The purpose of this research is to investigate the influence of punch velocity and holding time to the springback angle. The process is performed to the 0.1 mm thickness of copper foil. The punch velocities are 0.1 mm/s, 1 mm/s, and 10 mm/s. While the variation of holding time, which is set during the bottoming stage, are 7 s, 9 s, and 11 s. The result shows that the punch velocity clearly influences the springback angle. In addition, the holding time during the bottoming stage is a potential factor in springback angle correction.

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Analysis of microbending of CuZn37 brass foils based on strain gradient hardening models

Cited by 33 publications

References 15 publications

Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil

Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil

Influence of size effects on material properties and springback behavior of metal foils in micro bending: A review

Preliminary Investigation of Micro-V-Bending

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