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crack tip opening displacement

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Published: 01 July 1997
Fig. 13 Macrograph of the fracture surface of a crack tip opening displacement test specimen removed from the 1.07 m (42 in.) X-65 steel pipe. The regions of the surface shown correspond with the notch, precrack, stable crack growth, fast fracture, and overload zones. More
Image
Published: 01 July 1997
Fig. 21 Crack tip opening displacement versus the percent of grain-coarsened regions for several structural steels. Source: Ref 25 More
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...
Image
Published: 01 November 2012
Fig. 9 Sample specimen showing the definition of crack mouth opening displacement (CMOD) and crack tip opening displacement (CTOD). CTOD is the diameter of the circular arc at the blunted crack tip and should not be confused with the plastic zone. Source: Ref 4 More
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
... flaw, the crack is a flat surface in a linear elastic stress field, and the energy released during rapid crack propagation is a basic material property that is not influenced by part size. As shown in Fig. 13.13 , there are three modes of crack tip opening displacement. Mode I, tensile opening...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... ). Figure 5.9 shows the XSP obtained by displacing the topographs along a center plane normal to the fracture surface. The crack tip opening displacement, δ, is measured at the tip of the fatigue precrack, i.e., at the onset of crack extension. Fig. 5.9 XSP of crack tip showing successive stages...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630281
EISBN: 978-1-62708-270-9
...), the opening displacement of the notch surfaces at the notch and in the direction perpendicular to the plane of the notch and the crack. The displacement at the tip is called the crack tip opening displacement (CTOD); at the mouth, it is called the crack mouth opening displacement (CMOD). crack size. A lineal...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180197
EISBN: 978-1-62708-256-3
... displacement (COD). On a KIc specimen, the opening displacement of the notch surfaces at the notch and in the direction perpendicular to the plane of the notch and the crack. The displacement at the tip is called the crack tip opening displacement (CTOD); at the mouth, it is called the crack mouth opening...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.9781627082563
EISBN: 978-1-62708-256-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780211
EISBN: 978-1-62708-281-5
... a strong dependence on the rate at which stress is applied. The crack opening displacements in polymeric materials can be quite large and, hence, the microstrain at a crack tip will be similarly large. In polymeric materials displaying minimal levels of plasticity and/or inelasticity, such as untoughened...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930039
EISBN: 978-1-62708-359-1
... ), are used to measure a material’s fracture toughness ( K Ic ), which is a material property. In the case of welding, fracture toughness is usually expressed using a value for crack tip opening displacement ( Ref 21 ). Fracture toughness testing has only recently begun gaining acceptance as applicable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... (1977) . 8.3.1 The Crack Opening Displacement The crack opening displacement (COD) concept is a crack tip strain criterion for fracture, stemming primarily from the work of Wells (1964) . For a crack in an elastic body, the crack opening displacement, v , at a distance r from the crack tip...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... on statically loaded precracked samples usually are conducted with either a constant applied load or with a fixed crack opening displacement, and the actual rate or velocity of crack propagation, da/dt , is measured ( Ref 9 ). The magnitude of the stress distribution at the crack tip (the mechanical driving...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... evaluated the corrosion and stress aspects of a pit to develop a model for crack initiation. They assumed that the corrosion conditions in the base of the pit were essentially the same as those on a flat surface and that initiation required that a critical crack-tip opening displacement be exceeded. Using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930163
EISBN: 978-1-62708-359-1
... to evaluate the intensity of the stress and strain field near the tip of the defect. The parameters that are most used are the crack tip stress intensity factor K , for linear elastic loading (LEFM), and the J -integral, or crack tip opening displacement (CTOD) for elastic-plastic loading (EPFM...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.9781627082709
EISBN: 978-1-62708-270-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... growth are also discussed. Linear-elastic fracture mechanics is the base for all the methods presented in these two chapters. Chapter 6 discusses methods based on nonlinear fracture mechanics, which are suitable for fatigue crack growth and/or fracture due to excessive yielding at the crack tip. 5.1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490021
EISBN: 978-1-62708-340-9
... conservative assessments of component integrity. The J-integral technique and the crack-opening-displacement (COD) technique have been developed as viable crack-initiation parameters, as part of the elastic-plastic fracture-mechanics (EPFM) procedure. To characterize crack growth and final instability...
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
... , specimen width Today, laboratory testing for fracture toughness relies more on servohydraulic equipment, which consists of mechanical test apparatus with sophisticated computer data acquisition and controls. Compliance-based fracture testing uses a crack-mouth opening displacement (CMOD) gage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... tests, because after the onset of SCC in small test specimens the gross section exposure stress decreases. This results from the opening of the crack (or cracks) under the high stress concentration at the crack tip (or tips) and causes some of the applied elastic strain to change to plastic strain...