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R-curve test method

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... of the second assumption is limited to the case of small-scale yielding where the linear elastic analysis is appropriate. These uncertainties, coupled with the complexity of the proposed test method ( Annual Book of ASTM Standards , 1981a), have limited the applicability of the R -curve approach. The R...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610101
EISBN: 978-1-62708-303-4
... with the steps involved in determining strain energy release rates, stress intensity factors, J-integrals, R-curves, and crack tip opening displacement parameters. It also covers fracture toughness testing methods and the effect of measurement variables. crack tip opening displacement elastic-plastic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780211
EISBN: 978-1-62708-281-5
....1995.090330901 24. “ Standard Test Methods for Plane Strain Fracture Toughness and Strain Energy Release Rate of Plastic Materials ,” D 5045, Annual Book of ASTM Standards , Vol 08.03 , ASTM , 1996 25. “ Standard Test Method for Determining J-R Curves of Plastic Materials ,” D 6068, Annual Book...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400033
EISBN: 978-1-62708-316-4
... by cross-section area at fracture ( A f ) and initial cross-section area ( A 0 ): (Eq 4.3) A r = ( A 0 − A f ) A 0 × 100 % Fig. 4.4 Engineering stress-strain curve; UTS, ultimate tensile strength ( Ref 4.4 ) Fig. 4.5 Determination...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.htpa.t53310167
EISBN: 978-1-62708-346-1
... . According to this figure, pile-up due to A FEM /A ( h ) > 1 occurs for ideal elastic-plastic materials with h r / h max > 0.85. The deviations due to pile-up decrease with increasing work hardening. Fig. 7 Normalized contact area, A FEM / A ( h ), according to finite element method...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060101
EISBN: 978-1-62708-355-3
... measurements of specimen width and thickness, which are required to calculate the stress, measurements can be made at intervals during the test to determine the r value (ASTM E 517, “Standard Test Method for Plastic Strain Ratio r for Sheet Metal”) and to determine the reduction in area and true strain...
Series: ASM Technical Books
Publisher: ASM International
Published: 15 June 2021
DOI: 10.31399/asm.tb.mpktmse.t56010001
EISBN: 978-1-62708-384-3
..., and methods such as impact testing or fracture toughness provide better predictions ( Ref 3 , 5 , 6 ). References References 1. Davis J.R. , Ed., Tensile Testing , 2nd ed. , ASM International , Materials Park, OH , 2004 10.31399/asm.tb.tt2.9781627083553 2. Gedney R...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... the system, the whole curve for σ y must be shifted (shown as the dotted line in Fig. 4.4a ). In other words, area A must be balanced by area B. The area under the distribution curve of σ y (i.e., area A plus area C) can be obtained by integrating σ y from 0 to r *. Since the size of area...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
... current. (b) Cathodic external current Therefore, for an anodic polarization curve, the true potential, E, is less than the experimentally measured potential, E exp , by an amount equal to the “IR correction,” I ex,a R′ S , as indicated in Fig. 6.8 . This correction becomes smaller as I ex...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ciktmse.t56080029
EISBN: 978-1-62708-460-4
... polarization resistance. The acquisition of R p reflects the corrosion resistance of the metal surface. In addition, surface analytical methods, such as scanning electron microscopy, can be applied to metal surfaces after immersion in an inhibitor-containing solution for different time intervals...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.htpa.9781627083461
EISBN: 978-1-62708-346-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.htpa.t53310067
EISBN: 978-1-62708-346-1
... of the measurement, as the signal is often slightly disturbed after the impact. If, however, the measurement point lies too far away from the test surface, internal friction may cause a change of the rebound velocity, v r . Even the width of the measured signal curve is important, because it provides information...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... , of the specimen under three-point test, apply: r = 6 Dd/ L 2 in which D is the deflection to obtain the maximum strain ( r ) of the specimen under test. To obtain data for flexural modulus, which is a measure of stiffness, flexural stress is plotted versus strain, r , during the test...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060209
EISBN: 978-1-62708-355-3
... sensitivity. Source: Ref 18 The plastic anisotropy parameter r (or R ) characterizes the resistance to thinning of a sheet material during tensile testing and is defined as the slope of a plot of width strain, ε w , versus thickness strain, ε t , ( Ref 22 ), that is: (Eq 4) r = d ε...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060013
EISBN: 978-1-62708-355-3
.... Cross-hatched regions in this curve represent the modulus of resilience ( U R ) of the two materials. The U R is determined by measuring the area under the stress-strain curve up to the elastic limit of the material. Point A represents the elastic limit of the spring steel; point B represents...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
..., which is shown by the distribution of the fatigue limit, σ, is a function of hardness, H, and residual stresses, σ r : (Eq 1) σ = f ( H , σ r ) The method of designing a usable characteristic for the fatigue limit distribution has been described in publications ( Ref 3 – 5...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930163
EISBN: 978-1-62708-359-1
... resistance curve, R curve, characterization as with ductile fracture. Brittle Fracture Brittle fracture occurs by a cleavage process and results in a sudden unstable event which can only be characterized by a single value of the fracture parameter which is being used ( Fig. 1 ). Brittle fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060033
EISBN: 978-1-62708-355-3
...-n , is raised to intersect the stress-strain curve. The point of intersection, r , is the EUL yield strength, and the value R is read from the stress axis. Typically, for many materials, the extension specified is 0.5%; however, other values may be specified. Therefore, when reporting the EUL...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060021
EISBN: 978-1-62708-343-0
... t + P = G where: P = R 1 ( T – T m )                   + R 2 (1/ T – 1/ T m ) G = B + C log σ          + D σ + E 2 σ A = Material stability factor Barrett et al. (1968) Ref 2.11 Grounes (1969) Ref 2.12 Manson and Ensign (1971) (Minimum-commitment method...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040083
EISBN: 978-1-62708-300-3
..., ERC/NSM-99-R-22. [Pietrzyk et al., 2001] Pietrzyk M. , Szyndler D. , Hodgson P.D. , “ Identification of Parameters in the Internal Variable Constitutive Model and Friction Model for Hot Forming of Steels, ” Simulation of Materials Processing: Theory, Method and Applications...