1-20 of 308 Search Results for

constant-amplitude stress cycling

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002370
EISBN: 978-1-62708-193-1
... of constant-amplitude ( S a ) stress cycling about a mean load S m . (a) The alternating load plotted vs. time. (b) Fracture for one specimen plotted vs. the number of cycles, N. (c) Fractures for ten specimens at one constant level of alternating load S a plotted vs. N Fig. 2 Variable...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002398
EISBN: 978-1-62708-193-1
...-Cycle Axial Fatigue Behavior High-Cycle Axial Fatigue Behavior Plane-Stress Fracture Toughness (<italic>K</italic><sub>c</sub>) Plane-Strain Fracture Toughness J-Integral Method Fatigue Crack Growth Rates (Constant Amplitude) Threshold Crack Growth Behavior Variable Amplitude...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009217
EISBN: 978-1-62708-176-4
...) Center-cracked tension specimen Fig. 2 Crack growth versus constant-amplitude stress cycles Because the fracture mechanics characterization is expressed in terms of da / dN versus Δ K , the a versus N data must be reduced to this format. The most commonly used numerical techniques...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002469
EISBN: 978-1-62708-194-8
.... Higher homologous temperatures are used in processing. High-Cycle Fatigue Low-Cycle Fatigue This article uses, unless stated otherwise, engineering stress σ and strain ε and cycles to failure N , where failure denotes separation of the test specimens. Results from constant amplitude, periodic...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002356
EISBN: 978-1-62708-193-1
... cycle: S a = 120 MPa. CA, constant amplitude. Source: Ref 43 Fig. 16 Hi-Lo tests on notched Al alloy specimens. Note the effects of compressive or tensile residual stress at the notch root. (a) Two-hole specimen. (b) Σ n / N = 2.04 (c) Σ n / N = 0.90. Source: Ref 38 Fig. 19...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003318
EISBN: 978-1-62708-176-4
... established from stress-log cycle plots, also known as S - N curves. In these tests, uncracked specimens are subjected to a constant amplitude load cycle until failure occurs. Often fatigue tests are performed on closed-loop servohydraulic universal test machines, which enable fatigue tests to be performed...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002354
EISBN: 978-1-62708-193-1
... Region A Region B Region C Behavior at Constant Amplitude Instabilities during Ramp Loading Hysteresis Loop Transient Cyclic Deformation Behavior Cyclic Saturation Memory of Prior Deformation Memory Effect and the 1:2 Rule Effect of Predeformation Modeling of the CSS...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002365
EISBN: 978-1-62708-193-1
... m = 0 ) where ε a is strain amplitude, N f is cycles to failure for completely reversed cycling, E is the elastic modulus, and σ′ f , b , ε′ f , and c are material fatigue constants. A special cyclic stress-strain curve, as described in the previous article, is also needed: (Eq...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002350
EISBN: 978-1-62708-193-1
... of the critical effects on the fatigue of component details. Source: Ref 22 Fig. 8 Typical fatigue-strength curves for several polymers (30 Hz test frequency). Source: Ref 23 Fig. 9 Stress-strain hysteresis in a constant-amplitude strain-controlled fatigue test. Source: Ref 32...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002364
EISBN: 978-1-62708-193-1
... occurred. In this simple sequence, there are four events that resemble constant-amplitude cycling. These events (which are closed hysteresis loops) are: A-D-A, B-C-B, D-E-D and F-G-F. Each event is associated with a strain range and a mean stress. Of the various counting techniques in use (rainflow...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002366
EISBN: 978-1-62708-193-1
... among stress states is given by: (Eq 10) σ ¯ a + g ( σ h ) = C where C is a constant for a given fatigue life, subscript “a” denotes amplitude, and σ h denotes either the amplitude or mean value of hydrostatic stress over a cycle. Sines ( Ref 13 ) proposed a form in which...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006549
EISBN: 978-1-62708-210-5
... to life by a power-law relationship such that: (Eq 1) σ a = σ f ′ 2 N f b where the true stress amplitude (σ a ) is equal to Δσ/2 in a zero-mean constant amplitude test, and 2 N f is equal to reversals to failure (1 cycle = 2 reversals). The use of the number...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003668
EISBN: 978-1-62708-182-5
... and the time constants, τ 0 , from the model can be found in Ref 50 . Fig. 2 Nomenclature used to describe test parameters involved in cyclic stress testing. S a , stress amplitude; S m , mean stress; S r , stress range Fig. 3 Typical S - N curves for constant amplitude...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003313
EISBN: 978-1-62708-176-4
... of Constant Amplitude Fatigue Test Results for Metallic Materials.” It provides guidelines for presenting information other than just final data. Stress is the controlling quantity in this method. The most typical formats for the data are plots of the log number of cycles to failure (sample separation...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005419
EISBN: 978-1-62708-196-2
.... A simple rotating shaft having a slight misalignment will see a simple, fully reversed, constant-amplitude load cycle each revolution of the shaft. The wing on an aircraft will see a simple load cycle each flight due to a change in loading, wherein the fuselage supports the wing when the aircraft...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003315
EISBN: 978-1-62708-176-4
.... It assumes that the relationship between displacement and strain amplitude remains constant with detuning of the specimen due to crack growth. This problem can be avoided by measuring the strain directly with strain gages placed in the crack plane. Additional correction factors to the stress intensity...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002382
EISBN: 978-1-62708-193-1
... Growth Reference Stress Compounding Superposition Constant-Amplitude Loading Cycle-by-Cycle Counting with Variable-Amplitude Loading Data Input Flaws Load History Stress-Intensity Computer Modeling Errors Implications Data sets such as that shown in Fig. 1(b) must...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001038
EISBN: 978-1-62708-161-0
...) S r = S max − S min The stress amplitude, S a , in one-half the range of stress: (Eq 3) S a = S r 2 = ( S max − S min ) 2 During a fatigue test, the stress cycle is usually maintained constant so that the applied stress...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003382
EISBN: 978-1-62708-195-5
... ) is the residual strength scale parameter after n cycles; R 0 is the static strength scale parameter; S p is the peak stress magnitude of the constant amplitude loading; N is the scale parameter for the fatigue life distribution; and v is the strength degradation parameter. composite structures...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002353
EISBN: 978-1-62708-193-1
... in a notched specimen were more than ten times greater for the latter treatment at a nominal stress amplitude of 196 MN/m 2 . Source: Ref 16 Fig. 3 Maximum compressive stress, Δσ/2, versus cycles at a constant strain amplitude of Δε/2 = 0.75% for overaged Ni-14Al (at.%). Source: Ref 12...