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Determining the Limits of Formability

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Materials Testing for the Metal Forming Industry

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Abstract

This chapter ist widely based on refs. /5.1/ and /2.1/. Compared to the methods for determining the force and work requirements, the evaluation of the limits of metal forming processes has not yet been studied thoroughly.

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Abbreviations

a:

initial height of specimen in Fig. 5.10

b0 :

initial width of specimen in Fig. 5.10

b:

initial width of specimen in Fig. 5.10

b1 :

width of specimen after test (Fig. 5.10)

β:

deep-drawing ratio

ϑ:

azimut angle (cylindrical upset specimen)

εN :

relative elongation at fracture of notched tensile test piece (notched tensile elongation)

η:

stress ratio in the drawing test, see Eq. (5.2)

Fcr :

force required for causing bottom cracks in the Engelhardt test

Fdmax :

maximum drawing force in deep-drawing

φ1 :

natural strain in longitudinal direction in the tensile test on sheet specimens or the drawing test, see Fig. 5.6

φ2 :

natural strain in transverse direction in the tensile test on sheet specimens or the drawing test, see Fig. 5.6

φ̄B :

equivalent strain to fracture

φ̄L :

forming limit

K̄:

springback ratio

l:

reference length in Fig. 5.10

l1 :

length of specimen after test (Fig. 5.10)

ρ:

notch radius

r1 :

bending radius

σ1 :

stress in longitudinal direction in the drawing test, see Eq. (5.2)

σ2 :

stress in transverse direction in the drawing test, see Eq. (5.2)

t:

notch depth of notched tensile specimen (sheet metal), see Fig. 5.3

T:

characteristic value in the Engelhardt test

z:

axial coordinate (cylindrical upset specimen)

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Authors and Affiliations

  1. Institut für Umformtechnik, Universität Stuttgart, Holzgartenstraße 17, 7000, Stuttgart 1, Germany

    Dr.-Ing. habil. Klaus Pöhlandt

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  1. Dr.-Ing. habil. Klaus Pöhlandt
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© 1989 Springer-Verlag Berlin Heidelberg

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Pöhlandt, K. (1989). Determining the Limits of Formability. In: Materials Testing for the Metal Forming Industry. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-50241-5_5

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  • DOI: https://doi.org/10.1007/978-3-642-50241-5_5

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  • Print ISBN: 978-3-642-50243-9

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