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hysteresis loops

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
...Abstract Abstract This chapter compares and contrasts empirical approaches for partitioning hysteresis loops and predicting creep-fatigue life. The first part of the chapter presents experimental partitioning methods, explaining how they can be used to partition any loading cycle into its basic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060069
EISBN: 978-1-62708-343-0
...Abstract Abstract This chapter demonstrates the versatility of the strain-range partitioning method and its application to creep-fatigue problems involving complex loading histories. It begins with a derivation showing that it is possible to assess the damage of hysteresis loops combining two...
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
... materials and their fatigue behaviors. It then discusses the challenge of developing hysteresis loops for complex loading patterns and accounting for effects such as ratcheting and stress relaxation. The sections that follow provide a summary of the various ways mean stress is described in the literature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870123
EISBN: 978-1-62708-344-7
...Abstract Abstract This chapter addresses the cumulative effects of fatigue and how to determine its impact on component lifetime and performance. It begins by defining a loading history and its corresponding hysteresis loops that exposes the deficiencies of some of the theories discussed...
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
... tensile or compressive stress in the hysteresis loops causing variations in fatigue life as large as 50:1 depending on where the transition in fatigue behavior occurs. Neuber analysis notch effects plasticity Introduction Stress Concentrations in the Elastic Range The Classic use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... the microstructural damages associated with each of the four basic loading cycles. The discussion then turns to fatigue life prediction for different types of materials and more realistic loading conditions, particularly those in which hysteresis loops have more than one strain-range component. To that end...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060155
EISBN: 978-1-62708-343-0
... analysis, computerized finite element analysis, or direct experimental observation. In other words, it will be assumed that the hysteresis loops for all three principal directions can be evaluated. Equations appropriate for this purpose are based on equilibrium, compatibility, plasticity theory...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870009
EISBN: 978-1-62708-344-7
... stabilized hysteresis loop of an initially nonstable material. We use the complex straining history shown in Fig. 2.7(a) , applied to a material with single-amplitude stress-strain curve of Fig. 2.1 . For a stable material, the cyclic stress-strain curve is the double-amplitude curve shown in Fig. 2.2...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060111
EISBN: 978-1-62708-343-0
... measured by experimental observation of the hysteresis loop or if accurate constitutive equations are available to track stress and strain during the cycle. However, in some cases, neither approach will be practical; then, the calculations will involve engineering approximations. We shall illustrate a case...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870325
EISBN: 978-1-62708-344-7
... stress-strain curves of polymers at room temperature. Source: Ref 12.3 (a) Polycarbonate. (b) Polypropylene Fig. 12.7 Hysteresis loops generated in step tests of Fig. 12.6(a) for polycarbonate at room temperature. Source: Ref 12.3 Fig. 12.12 Hysteresis loops for three polymers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... 2 is called the plastic hysteresis (or simply the stress-strain hysteresis), an imitation of the magnetic hysteresis. The terminology that is used to characterize a hysteresis loop is given in Fig. 3.3 . This type of alternating tension and compression operation can be repeated many times, each...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860203
EISBN: 978-1-62708-348-5
... P. (1980) . Hysteresis in CwMn: The effect of spin orbit scattering on the anisotropy in the spin glass state. J. Phys. (Paris) 41 , 427 – 435 . Pugh E. W. and Ryan F. M. (1958) . Magnetic susceptibility of copper-nickel and silver-palladium alloys at low temperatures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... limits. Tests are continued for each specimen until the hysteresis loops become saturated. A curve is fit through the amplitude of these saturated hysteresis loops in order to establish a cyclic stress-strain curve. Figure 3 shows a comparison of the cyclic and monotonic stress-strain curves...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
..., and microcracks. The other part of the mechanical work evolves as heat. Both processes are obviously interdependent and relate to the specific nature of the relaxation time spectrum of the macromolecules considered. The total work done is measurable from the hysteresis loop encountered in fatigue testing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000131
EISBN: 978-1-62708-312-6
.... (One tesla, T = 10 –4 gauss). Source: Ref 5 Fig. 8.4 Hysteresis loops of typical soft (left) and hard (right) magnetic materials. Source: Ref 4 . Reprinted with permission from MPIF, Metal Powder Industries Federation, Princeton, NJ Fig. 8.2 Structure of a domain wall (schematic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240303
EISBN: 978-1-62708-251-8
... Hysteresis loop for a magnetically soft material The change in the domain structure during magnetization is shown in Fig. 17.15 . In the unmagnetized structure, the magnetic effects of the domains cancel out, and the metal is nonmagnetic. When a small magnetic field, H > 0, is applied...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
... stress to stress amplitude During cyclic loading within the elastic regime, stress and strain are directly related through the elastic modulus. However, for cyclic loading that produces plastic strains, the responses are more complex and form a hysteresis loop ( Fig. 14.10 ). From point O up...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.9781627083447
EISBN: 978-1-62708-344-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
...: Ref 8.70 Fig. 8.20 Hysteresis loops for four bithermal loadings used to evaluate various predictive methods. (a) PP. (b) CC. (c) CP. (d) PC Fig. 8.21 Simplified schematic illustration of the creep-fatigue interaction when tensile creep occurring along grain boundaries is reversed...