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cyclic stress-strain curves

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870009
EISBN: 978-1-62708-344-7
... to strain cycling. cyclic hardening cyclic softening cyclic straining cyclic stress-strain curves gray cast iron uniaxial strain cycling Introduction Metal fatigue has long been associated with variations of stress and strain. In Wöhler’s time, about 150 years ago, it was his...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... and temperature. For each curve, there is a point A that represents the instantaneous strains (both elastic and plastic) induced upon initial loading: Curve 1 : For curve O 1 A 1 in Fig. 1.3(a) , the stress and temperature are too low to cause time-dependent deformation; only instantaneous elastic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140193
EISBN: 978-1-62708-335-5
... information as available. Compressive tangent modulus curves are presented for certain alloys. The effects of cyclic loading are given on several curves. aluminum alloys compressive tangent modulus curves cyclic hardening stress-strain curves This collection of stress-strain curves...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870075
EISBN: 978-1-62708-344-7
... by the distance OO ′. For ease of illustration, the first segment OAB of the four initial stress-strain curves are taken to be identical. Fig. 4.3 Schematic patterns of strain ratcheting under force control for (a) cycling hardening and (b) cyclic softening, and patterns of cyclic stress relaxation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... the applicability of this rule, Feltner and Landgraf ( Ref 3.6 ) examined test results for 35 materials with available monotonic properties and cyclic stress-strain curves. The materials included 17 steels, 10 pure metals and alloys, four nickel-base superalloys, two aluminum alloys, a titanium alloy, and a cast...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870179
EISBN: 978-1-62708-344-7
... and maintains the condition that the stress/strain relation is the appropriate stress/strain curve of the material. While the early loadings of a cyclic history may involve some hardening or softening, it is common in engineering calculations to neglect these effects, and then to make appropriate corrections...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060111
EISBN: 978-1-62708-343-0
... of the material with temperature. Fig. 6.1 Input information for treating creep fatigue by strain-range partitioning. (a) Partitioned strain-range life relationships. (b) Cyclic stress-strain curve and hysteresis loop for rapid cycling obtained by principle of double-amplitude construction. (c...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870045
EISBN: 978-1-62708-344-7
... the stress-strain curve is shown in Fig. 3.3(a) . Suppose a material is strained to point A , and then completely reversed. The cyclic stress-strain path (hysteresis loop) is OAOA ′ O in Fig. 3.3(b) . Alternatively, the material could be strained to point B , the reversal giving loop BB ′ B ″ B...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.9781627083447
EISBN: 978-1-62708-344-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870157
EISBN: 978-1-62708-344-7
... is computed from knowing the bending stress σ y at a distance y from the neutral axis. Stress is determined from the strain using the cyclic stress-strain curve. The incremental moments are integrated across the entire cross section to give the total bending moment: (Eq 7.37) d M = y σ y...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870325
EISBN: 978-1-62708-344-7
...-strain curves can be constructed in several ways similar to those used for metals. Stabilized stress values (at ½ life) for selected strain ranges would be a direct way of obtaining the cyclic stress-strain curve, but the incremental stress tests, for which test results are shown in Fig. 12.6 , have...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... conditions, generally accompanied by a cyclic softening phenomenon in plastics ( Ref 2 , 9 ). Under cyclic strain conditions, the fatigue response is best characterized by the cyclic stress-strain curve. This curve is created by testing several specimens subjected to a range of controlled cyclic strain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
... in Figure 6-14B and 6-14C , respectively. As a rule of thumb, high strength alloys cyclically strain harden. Eventually a stable hysterisis loop is obtained. If stable hysteresis loops are obtained at a number of strain ranges, the tips of these loops may be connected to form a cyclic stress strain curve...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490111
EISBN: 978-1-62708-340-9
... be expresssed in a way similar to the monotonic stress-strain curve: (Eq 4.7) Δ σ = A Δ ∊ p β where A is a strength coefficient and β is the cyclic strain-hardening exponent. This is the cyclic analogue of the tensile stress-strain curve. Cyclic stress-strain relationships for several...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870105
EISBN: 978-1-62708-344-7
... much the transition point T is displaced. This transition point must be displaced horizontally because only under this condition will the cyclic stress-strain curve be unaltered, as we would expect. Thus, through point T a horizontal line is drawn to determine T ′ at its intersection with line...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870001
EISBN: 978-1-62708-344-7
... the material to behave as if its stress-strain curve were truncated—that is, cut off at a lower point than it is able to achieve in monotonic loading. The introduction of mean compressive stress is also a highly effective way to improve the fatigue behavior of a specimen or machine component. This chapter also...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870375
EISBN: 978-1-62708-344-7
... strain components. It also provides information on mechanical property and fatigue testing, the use of hysteresis energy to analyze fatigue, a procedure for inverting equations to solve for dependent variables, and a method for dealing with the statistical nature of failure. cyclic stress-strain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... stress levels are, counterclockwise starting from U: 15, 16, 17.4, 19.7, 21.6, 22.4, and 27.8 MPa (2.2, 2.3, 2.5, 2.9, 3.1, 3.2, and 4 ksi). Source: Ref 7.21 Thermohysteresis is why most (if not all) polymers exhibit cyclic strain softening in their cyclic stress-strain curves ( Fig. 7.14...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870201
EISBN: 978-1-62708-344-7
... vicinity but also reducing the capability of the material to tolerate the elevated stress by reducing its ductility. Distinction between Plane Stress and Plane Strain An important distinction develops between plane stress and plane strain in the vicinity of the crack tip. For plane stress σ z = 0...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... (Eq 20b) S fl ≈ 50  ksi Often, the 0.1% offset yield stress from the cyclic stress-strain curve may be used to approximate S fl . For high-strength steels and nonferrous metals, it is more appropriate to use ⅓ S u ≈ S fl at 10 8 cycles. In general, however, it is probably...