Size effects in the processing of thin metal sheets

Raulea, LV; Goijaerts, AM Ad; Govaert, Leon Le; Baaijens, Fpt Frank

doi:10.1016/s0924-0136(01)00770-1

Cited by 256 publications

(132 citation statements)

References 2 publications

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“…With a reduction in the sheet thickness, the grains on the free surface are less constrained and more easily deformed at a substantially lower flow stress than in the case of the bulk state [43,44]. Kals et al [45] expressed the volume fraction a of grains having a free surface, as shown in Eq.…”

Section: Strength Of As-rolled and Aged Sheetsmentioning

confidence: 99%

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 degrees celcius. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-Cr-Mn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm. An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 1C. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-CrMn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm.

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Section: Strength Of As-rolled and Aged Sheetsmentioning

confidence: 99%

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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“…This is because when the thickness downscales to the same magnitude as the grain size, mechanical properties of individual grains in the plastic zone have an increasing influence on the forming behavior, resulting in a trend of the increase in yield strength. Similarly, Raulea et al [14] observed this trend in experiments of aluminum sheets.…”

Section: Effect Of Thickness To Grain Size Ratio On Materials Propertiesmentioning

confidence: 56%

“…2(a). This "thinner is weaker" effect has been verified via different metal sheets, such as aluminum [14] and brass [17]. It is caused by the increasing share of surface grains in the overall volume when the sheet thickness decreases.…”

Section: Effect Of Thickness On Materials Propertiesmentioning

confidence: 81%

“…These factors have a close relationship with material properties, which in turn affect the dimensional accuracy of micro-bent parts. According to available literatures, foil thickness and grain size, especially for the ratio of metal foil thickness to grain size, are key factors affecting springback behavior [10,13,14]. Nevertheless, few reviews highlighting the influence of the forementioned three factors on material properties and springback angle have been reported.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Kals and Eckstein [7] investigated the size effect in tensile tests, air bending and punching of sheet metals by miniaturisation based on similarity theory, and they concluded that the deformation behaviour in micro-punching is strongly different from those in both tensile test and air bending. Further research from Raulea et al [8] showed that the yield strength is related to the ratio between the grain size and specimen thickness, which was also demonstrated in a planar blanking and bending process. Chan et al [9] investigated the scatter effect of grain mechanical properties with micro-compression process and proposed a finite element model with consideration of grain size and the scatter effect of flow stress, which provided a basis for understanding and modelling of materials size effect in microforming process.…”

Section: Introductionmentioning

confidence: 85%

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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Size effects in the processing of thin metal sheets

Cited by 256 publications

References 2 publications

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

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

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

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