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crack length

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540379
EISBN: 978-1-62708-309-6
...Abstract Abstract This appendix presents an analytical model that estimates damage rates for both crack initiation and propagation mechanisms. The model provides a nonarbitrary definition of fatigue crack initiation length, which serves as an analytical link between initiation and propagation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090359
EISBN: 978-1-62708-266-2
... diffraction and amplitude-drop techniques, the height, length, and location of intergranular cracks can be accurately determined anywhere along the walls of the pipe as well as in weld areas. boiling water reactor crack detection crack height crack length intergranular stress-corrosion cracking...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
...Abstract Abstract Unlike metals, in which fatigue failures are due to a single crack that grows to a critical length, the effects of fatigue in composites are much more distributed and varied. As the chapter explains, there are five major damage mechanisms that contribute to the progression...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270087
EISBN: 978-1-62708-301-0
...Abstract Abstract A turbine blade in an aircraft engine failed, fracturing at the root above the fir tree region. Fractography indicated that a fatigue crack initiated at the trailing edge of the blade and the final fracture occurred when the crack reached critical length. Although the exact...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270154
EISBN: 978-1-62708-301-0
... at the trailing edge of the blade. The crack then propagated through the outer skin toward the leading edge of the blade. Once the fatigue crack reached critical length, the sheet metal fractured catastrophically, tearing away from the blade. fatigue crack main rotor blades SEM fractography Summary...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... condition, ASTM E 399 ( Ref 4.17 ) specifies that both specimen thickness and crack length must meet a minimum size requirement. The following conditions: (Eq 4.11a) B > 2.5 ⋅ ( K IC / F ty ) 2 and (Eq 4.11b) a > 2.5 ⋅ ( K IC / F ty...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630257
EISBN: 978-1-62708-270-9
..., which can be characterized by a single parameter, crack-tip stress intensity factor, K. K represents a single parameter that includes both the effect of the stress applied to a sample and the defect size. It can have a simple relation to applied stress and crack length, or the relation can involve...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... , 1998 5.8. Isida M. , Effect of Width and Length on Stress Intensity Factors of Internally Cracked Plate Under Various Boundary Conditions , Int. J. Fract. Mech. , Vol 7 , 1971 10.1007/BF00184306 5.9. Brown W.F., Jr. and Srawley J.E. , Plane Strain Crack Toughness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... Propagation Processes 1.8 Crack Propagation Mechanisms 1.9 Crack-Tip Chemistry and Microstructure 1.10 Crack Length Considerations 1.11 Summary References References 1.1 Michalske TA. and Freiman S.W. , Nature , Vol 295 , Feb 11 , 1982 , p 511 10.1038/295511a0 1.2...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780211
EISBN: 978-1-62708-281-5
.... The procedure for testing this requirement is detailed in ASTM D 5045. An interim value of the critical strain energy release rate, G Q is determined by: (Eq 8) G Q = U Bb ϕ where ϕ is a function of b and the original crack length, a . This interim value can be qualified...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780055
EISBN: 978-1-62708-281-5
... lengths ( Eq 10 ). The final crack length a f is computed from the fracture toughness of these materials. Thus, over the range of stresses for the S - N curves, the initial crack lengths can be computed. Ideally, these crack lengths would be independent of applied stress level. However, while...
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
... essentially on four parameters: the nominal stress σ in the vicinity of the crack (the stress that would be present in the region of the crack if the crack were not present); the crack length a ; and two physical properties, E and γ e . We note, however, that these four parameters are really grouped as two...
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
...-concentration factor for a round hole, as described in Chapter 2, “Mechanical Behavior,” in this book. Fig. 1 Analysis of crack in wide plate. Source: Ref 1 Here, σ o is the magnitude of the applied nominal tensile stress, ρ t is the radius of the crack tip, and a is the length...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240221
EISBN: 978-1-62708-251-8
..., and a is the length of a surface crack or one-half the length of an internal crack. For a relatively long microcrack that has a small tip radius (sharp crack), the quantity ( a /ρ t ) 1/2 is large, and Eq 13.1 reduces to: (Eq 13.2) σ m = 2 σ o ( a ρ t ) 1 / 2 The ratio...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060149
EISBN: 978-1-62708-261-7
... applied stress, the point at which the crack will begin to propagate is reached when an incremental increase in the crack length produces no net change in the overall energy of the system. And it is at this point where the results can be sudden and catastrophic. A classic example from World War II...
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
..., a c , corresponding to failure as a function of the number of load cycles ( Fig. 14.17 ). The crack growth rate, da / dn , can be determined from the slope of the curve. Initially, the crack growth rate is slow but increases with increasing crack length. Of course, the crack growth rate is also...
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
... ( Fig. 40 ). The crack growth rate ( da/dn ) can be determined from the slope of the curve. Initially, the crack growth rate is slow but increases with increasing crack length. Of course, the crack growth rate is also higher for higher applied stresses. If one can characterize the crack growth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.9781627082815
EISBN: 978-1-62708-281-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... C.J. , Ed., The Measurement of Crack Length and Shape During Fracture and Fatigue , Chameleon Press , 1980 10. Pugh E.N. , Bertocci U. , and Ricker R.E. , National Bureau of Standards, unpublished research, 1987 11. Williams D.P. and Nelson H.G. , Metall...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
...Abstract Abstract This chapter addresses the challenge of selecting an appropriate stress-corrosion cracking (SCC) test to evaluate the serviceability of a material for a given application. It begins by establishing a generic model in which SCC is depicted in two stages, initiation...