Sheet Metal Forming

Vollertsen, Frank

doi:10.1007/978-3-642-30916-8_5

Cited by 13 publications

(14 citation statements)

References 37 publications

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“…The comparison of the mechanical properties of the bimetallic foils BDC4a, BDC4b and BDC4c sputtered at 4 kW DC and containing Al-Sc-Zr layers of respectively 5 µm, 10 µm and 15 µm, shows as expected, that the apparent Young's modulus, the yield and tensile strength of the bimetallic foils increase when the volume fraction (ratio of the Al-Sc-Zr layer thickness to the total thickness of the bimetallic foil) of Al-Sc-Zr in the bimetallic foil decrease or reciprocally when the volume fraction of stainless steel increases. The evolution of the mechanical properties in bimetallic foils with the volume fraction of components can be predicted by the rule of mixtures [19]: PAB = VAPA + VBPB (1) With VA and VB designating the volume fractions of component A and B in the bimetallic foil and PA and PB representing a particular mechanical characteristic of components A and B like Young's modulus, yield strength, strain at fracture or the ultimate tensile strength. The validity of the law of mixture for the prediction of respectively apparent Young's modulus, the deformation at fracture, the yield and the ultimate tensile strength of the produced Al-Sc-Zr / stainless steel bimetallic foils has been tested by using the data of Tables 3 and 4.…”

Section: Tensile Properties Of Monometallic Al-sc-zr Foilsmentioning

confidence: 99%

“…Micro deep drawing is an efficient cold sheet forming process for the mass production of hollow microscopic parts with complex shape, which are widely used in micro system technologies (MST) and micro electromechanical systems (MEMS) such as connector pins, resistor caps, lead chip frames or parts of pressure sensors [1]. The principle of micro deep drawing is essentially similar to the conventional (macroscopic) deep drawing process: a metallic sheet is maintained by a blank holder and put in shape through the action of a punch into a die.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties and drawability of thin bimetallic aluminum-scandium-zirconium / stainless steel foils and monometallic Al-Sc-Zr fabricated by magnetron sputtering

et al. 2018

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Al-Sc-Zr alloys are interesting for the production of high strength micro components by micro deep drawing. These alloys show a good hardenability due to the formation of nanometer-scale spheroidal Al3(Sc, Zr) precipitates, which are highly coherent with the aluminum matrix. However, the formation of these precipitates in Al-Sc-Zr foils fabricated by conventional metallurgical methods dramatically reduces their ductility and drawability. In this work, magnetron sputtering was used to produce Al-Sc-Zr foils and Al-Sc-Zr / stainless steel bimetallic foils which are nearly free of these precipitates. Tensile tests were carried out to measure and compare the mechanical properties of monometallic Al-Sc-Zr foils and bimetallic Al-Sc-Zr / stainless steel foils deposited with varying plasma target powers and containing different volume fractions (layer thickness) of Al-Sc-Zr. Micro deep drawing was used to determine the drawability of selected monometallic and bimetallic foils. The results show that the density of monometallic Al-Sc-Zr foils can be improved significantly by increasing the DC target power and by using the high power impulse magnetron sputtering (HiPIMS) technology, resulting in foils with higher ductility. Bimetallic foils achieved higher strength and ductility than monometallic Al-Sc-Zr foils. Their mechanical properties vary with the target power and the volume fraction (thickness) of Al-Sc-Zr. The limit drawing ratio of HiPIMS deposited monometallic foil was 1.7 or 1.8 depending on the side of the foil facing the die, whereas a limit drawing ratio of 1.9 was observed for bimetallic foils.

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Section: Tensile Properties Of Monometallic Al-sc-zr Foilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tensile properties and drawability of thin bimetallic aluminum-scandium-zirconium / stainless steel foils and monometallic Al-Sc-Zr fabricated by magnetron sputtering

et al. 2018

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“…This phenomenon is so called ''smaller is weaker.'' [14] However, if N further decreases, meaning that only a very few or no grain boundaries are present across the specimen thickness, several authors reported an increase of the flow stress. For instance, tensile test results of 99.999 pct Al performed by Hansen [15] showed an increase in the flow stress as N decreased slightly from 3.9 to 3.2.…”

Section: Introductionmentioning

confidence: 98%

“…This phenomenon is so called ''smaller is stronger''. [14] From the above findings, ultra-thin sheets can be defined as sheets having a thickness between 13 lm and 300 lm and contains from 2-6 up to 10-15 grains in the thickness. A summary of the effect of N on the flow stress based on the findings reported in the literature is presented in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Involved in the Micro-forming of Ultra-thin Stainless Steel Sheets

Pham

Thuillier

Manach

2015

Metall Mater Trans A

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The objective of this paper is to characterize the mechanical behavior of an ultra-thin stainless steel, of 0.15-mm thickness, that is commonly used in the manufacturing of miniature connectors. The main focus is the relationship between some microstructural features, like grain size and surface roughness, and the macroscopic mechanical behavior investigated in uniaxial tension and simple shear. In tension, adaptations to the very small sheet thickness, in order to hold the specimen under the grips, are presented. Yield stress, initial elastic modulus, and evolution of the loading-unloading slope with plastic deformation were evaluated. Moreover, the kinematic contribution to the hardening was characterized by monotonic and cyclic simple shear test and reproduced by a mixed hardening law implemented in Abaqus finite element code. Then, the evolution of surface roughness with plastic strain, both in tension and simple shear, was analyzed. It was shown that in the case of an ultra-thin sheet, the stress levels, calculated either from an average thickness or when considering the effect of the surface roughness, exhibit a significant difference. Finally, the influence of surface roughness on the fracture of a tensile specimen was also investigated.

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“…In this study, the main components of micro-blanking tool is fabricated by mechanical material removal method. This is suitable to be applied on a single tool piece production and intended for small-scale production of micro parts [1]. In the tool components machining process, the entire machining system requirements must be met well, such as machine tool itself, environment, sub-system, and reliable data management.…”

Section: Introductionmentioning

confidence: 99%