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ASTM E646-16
Standard Test Method for Tensile Strain-Hardening Exponents (n -Values) of Metallic Sheet Materials
STANDARD published on 1.2.2016
The information about the standard:
Designation standards: ASTM E646-16
Publication date standards: 1.2.2016
SKU: NS-633751
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: American technical standard
Category: Technical standards ASTM
The category - similar standards:
Annotation of standard text ASTM E646-16 :
Keywords:
ICS Number Code 77.140.50 (Flat steel products and semi-products)
Additional information
| Significance and Use | ||||||||||||||||
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5.1 This test method is useful for estimating the strain at the onset of necking in a uniaxial tension test 5.2 The strain-hardening exponent may be determined over the entire plastic stress-strain curve or any portion(s) of the stress-strain curve specified in a product specification. Note 4: The engineering strain interval 10–20% is commonly
used for determining the strain-hardening exponent, n, of formable low-carbon steel
products
5.3 This test method is not intended to apply to any portion of the true stress versus true strain curve that exhibits discontinuous behavior; however, the method may be applied by curve-smoothing techniques as agreed upon. Note 5: For example, those portions of the stress-strain
curves for mild steel, aluminum, or other alloys that exhibit yield
point and Lüders band elongation, twinning, or Portevin–Le
Chatelier effect (PLC) may be characterized as behaving
discontinuously.
Note 6: Caution should be observed in the use of
curve-smoothing techniques as they may affect the n-value.
5.4 This test method is suitable for determining the tensile stress-strain response of metallic sheet materials in the plastic region prior to the onset of necking. 5.5 The n-value may vary with the displacement rate or strain rate used, depending on the metal and test temperature. |
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| 1. Scope | ||||||||||||||||
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1.1 This test method covers the determination of a strain-hardening exponent by tension testing of metallic sheet materials for which plastic-flow behavior obeys the power curve given in the Introduction. Note 1: A single power curve may not be a satisfactory fit to
the entire stress-strain curve between yield and necking. If such
is the case, more than one value of the strain-hardening exponent
may be obtained 1.2 This test method is specifically for
metallic sheet materials with thicknesses of at least 0.005 in.
(0.13 mm) but not greater than 0.25 in. (6.4 mm). The method has
successfully been and may be applied to other forms and thicknesses
by agreement
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Note 2: The value of the strain-hardening exponent,
1.4 This standard does not purport to
address all of the safety concerns, if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
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| 2. Referenced Documents | ||||||||||||||||
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