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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500249
EISBN: 978-1-62708-317-1
... Abstract Sheet metal spinning is a forming technique that produces axially symmetric hollow bodies with nearly any contour. It is often used in combination with flow forming and shear spinning to manufacture a wide range of complex parts. This chapter describes the operating principles, stress...
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Published: 01 August 2012
Fig. 2.34 Shear forming More
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Published: 01 January 2015
Fig. 11.19 Progressive steps in shear forming a cone More
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Published: 01 December 2004
Fig. 4 Forming limit diagram including shear fracture. Source: Ref 14 More
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Published: 01 June 1983
Figure 7.3 Typical form of the temperature dependence of critical resolved shear strength. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400005
EISBN: 978-1-62708-316-4
... factor, m ( Eq 2.3 ), is used to model friction conditions. Recent studies in forming mechanics indicate that Eq 2.2 adequately represents the frictional shear stress in sheet metal forming. There are various methods of evaluating friction, that is, estimating the value of μ or m . Tests most...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480243
EISBN: 978-1-62708-318-8
... to achieve a desired radius. Spinning and Shear Forming Spinning and shear forming are processes for shaping sheet metal into seamless hollow parts using pressure on a rotating workpiece. Spinning involves only minor thickness changes in the sheet metal, whereas shear forming is an extension...
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Published: 01 August 2005
(90 °C, or 195 °F), a radial fracture zone formed around the fibrous region, which formed first; also, the shear lip here is smaller. (c) No fibrous region formed in the specimen tested at −80 °C (−110 °F). Instead, fracture formed a radial zone that extends nearly to the specimen surface More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040067
EISBN: 978-1-62708-300-3
..., m, in the simple exponential law, σ ¯ = C ( ε ˙ ) m , used to express the strain-rate dependency of flow stress, discussed in Chapter 4 . Recent studies in forming mechanics indicate that Eq 7.2 adequately represents the frictional shear stress in forging, where...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630071
EISBN: 978-1-62708-270-9
.... This type of fracture originates near the center of the section, with multiple cracks that join and spread outward until the 45° shear lip forms at the end of the fracture. Photo courtesy of Packer Engineering Associates, Inc. Fig. 3 Two identical steel bolts that had been given different heat...
Book Chapter

By Soumya Subramonian
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500001
EISBN: 978-1-62708-317-1
... material is sheared to a desired shape. In blanking, the removed piece of material is the product, whereas in piercing, the material that is removed is scrap, while the remaining part of the strip is the product ( Fig. 1.1 ). Blanking or piercing is used in almost all sheet-forming operations. The size...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390064
EISBN: 978-1-62708-459-8
... at a specified shear rate. Departure from Newtonian behavior, or Non-Newtonian behavior, may take many forms: Dilatant fluids show an increase in viscosity with shear rate ( Fig. 5.3a ). This is typical of lubricants that are high in solid content. With the lubricant at rest, the solid particles...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400027
EISBN: 978-1-62708-316-4
... + ∂ w ˙ ∂ y ) Hence, for the most general three-dimensional deformation case, the complete set of strain rate components consists of three normal strain rate components and three independent shear strain rate components. In sheet metal forming, axisymmetric deformation problems...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630101
EISBN: 978-1-62708-270-9
... a 45° angle. It is this slant fracture—frequently called a “shear lip”—that forms the cup-and-cone shape characteristic of many tensile fractures of ductile metal. This slant fracture is useful for study of many fractures, for it represents the end of the fracture process at that location. Tensile...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040051
EISBN: 978-1-62708-300-3
..., this chapter discusses two major yield criteria that have been used extensively in the analysis of metal forming and forging. Tresca or shear stress criterion of yield or plastic flow von Mises or distortion energy criterion of yield or plastic flow 5.2.1 Tresca Yield Criterion The Tresca...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.t56020001
EISBN: 978-1-62708-389-8
... Upon application of a shear stress on an edge dislocation, Fig. 4 shows that a step is formed eventually, along with the disappearance of the dislocation. This appears to imply that the dislocation density should decrease with deformation. In reality, plastic deformation results in increased...
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Published: 30 November 2013
Fig. 1 Schematic sketch of microstructural changes in crystal structure due to repetitive shearing forces. Spheres represent atoms, and lines represent attractive and repulsive interatomic forces. An edge dislocation, represented by the inverted T-shaped symbol, is an imperfection More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400089
EISBN: 978-1-62708-316-4
... interface create hydrodynamic conditions. Coulomb, Tresca, and Modified Shear Friction Models Two friction models are commonly used to describe the frictional condition in metal forming processes: Coulomb’s friction model ( Eq 7.1 ) and the shear friction model ( Eq 7.2 ). Both models quantify...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040017
EISBN: 978-1-62708-300-3
... 3.1 Introduction The purpose of applying the plasticity theory in metal forming is to investigate the mechanics of plastic deformation in metal forming processes. Such investigation allows the analysis and prediction of (a) metal flow (velocities, strain rates, and strains), (b) temperatures...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740163
EISBN: 978-1-62708-308-9
... at room temperature and must therefore be formed at elevated temperatures. Preparation of Plate and Flat Sheet Prior to forming, the plate or sheet must be cut to the proper size. This can be done by a number of methods—the most prevalent being sawing, shearing, and oxyfuel gas cutting. Because...