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induced plastic zone size

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700071
EISBN: 978-1-62708-279-2
... the plastic zone around its tip. The size of the plastic zone and, hence, the toughness of the metal decreases rapidly as the yield stress, σ y , increases. This means that increasing the yield strength causes the plastic zone around the tip of the crack to shrink and this causes the toughness to decrease...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... for plastic-framed safety glasses. Investigation Metal-framed PC ophthalmic lenses appeared to have shattered from acetone solvent-induced cracking. The failed lenses exhibited primary and secondary cracks ( Fig. 9 ), which were associated with solvent swelling and crazing. All previous solvent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220445
EISBN: 978-1-62708-259-4
... in the CCT curve super-imposed in the right side of the figure starts at the end of the treatment inside the critical zone. Source: Ref 8 Fig. 13.20 Transformation-induced plasticity (TRIP) steels heat-treated in the critical region followed by quenching and austempering. Ferrite grains...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780109
EISBN: 978-1-62708-268-6
... are also susceptible to unique failure modes, as explained subsequently. Aging can induce failures in plastic materials. Age-related failures can be the result of exposure to an environment that accelerates the plastics aging process (chemicals that interact with the material, moisture, heat...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... deformation zone. For a crazeable polymer ( Fig. 10 ), a Dugdale ( Ref 13 ), or strip yield, approximation is used to estimate the size of this plastic zone, r d : (Eq 12) r d = π 8 ( K I σ y ) 2 where σ y is the craze stress. For an elastic...
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
... most engineering materials contain defects, and thus regions of stress concentration that intensify strain, most fatigue cracks initiate and grow from structural defects. Under the action of cyclic loading, a plastic zone develops at the defect tip. This zone of high deformation becomes an initiation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130111
EISBN: 978-1-62708-284-6
... growth curves. The near-threshold, Paris regime, and final failure regions are also indicated on the curves. Fig. 19 Crack closure mechanisms induced by (a) plasticity, (b) roughness, and (c) oxide Fig. 20 Load ratio effect on Δ K eff in a fatigue cycle. (a) K min < K cl...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
... the plastic gasket material in order to complete the bond. The number, size, and dispersion of metallic particles in the gasket material are closely controlled. The operating frequency of the induction generator is generally 3 to 5 MHz because of the small size of the particles. Since the current through...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... the K eff . However, in the above equations, the crack-tip plastic zone size ( r p or r y ) has been given as functions of K and F ty . Now K is also a function of the effective crack length ( a + r y ). Clearly, implementation of the effective crack length approach to fatigue crack growth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040295
EISBN: 978-1-62708-300-3
...: Mechanically induced fatigue fracture occurs when a crack is induced and propagates through a die due to mechanical loading. Crack initiation occurs if the tool load exceeds the yield strength of the tool material in the area of a stress concentration, and a localized plastic zone forms. This zone generally...
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
... ). The kinetic-energy term (item 3) is also considered to be small and can be neglected. Therefore, only the other three components (items 1, 2, and 5) are considered in the analysis. Also, if the size of the plastic zone at the tip of the crack is small compared with the total volume of the body, the strain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770199
EISBN: 978-1-62708-337-9
... been generated to produce a tensile peak. Conversely, the effect of plastic deformation at the immediate surface has predominated and induced surface compressive stresses sufficient to more than counter the heat-induced tensile stresses. It is likely that the type II curve is more typical of production...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130001
EISBN: 978-1-62708-284-6
..., and axial-compressive loads, then the combined effect of the applied load type, shape, and size and the material properties should be analyzed. Design for those elements subjected to axial compression should be intended to avoid not only plastic collapse but also elastic instabilities. Elastic instabilities...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500273
EISBN: 978-1-62708-317-1
... to develop. The stress state under the tool could give an explanation why, for some test shapes used in ISF, fracture is not preceded by localized necking, but for others, it is. Localized Deformation: The plastic deformation in ISF is localized; that is, the plastic zone is always embedded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610585
EISBN: 978-1-62708-303-4
...) Heat-Affected Zone Cracks Hydrogen-Induced Cracking (Cold Cracking) Lamellar Tearing An example of this would be part-through drill holes in a bicycle handlebar stem, resulting in fatigue initiation at the holes and subsequent fracture ( Fig. 25 ). Four types of cracking are a concern...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... or intergranular fracture) or from geometric conditions (notches, cracks, section size) that constrain deformation and thereby induce plane-strain crack growth under tension. These various mechanisms are described in section 2.4 . Fracture by glide is a ductile-type fracture from deformation along a shear...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
... tasks. 6.1 Elastic-Plastic Fracture Mechanics Large-scale yielding is not limited to the conventional definition of crack-tip plastic zone size. Geometry-induced plasticity often plays an important role in the crack growth behavior and residual strength of a structural member. The local area...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900325
EISBN: 978-1-62708-358-4
... by stress without any appreciable plastic flow. Ductile fracture is a strain-controlled fracture that occurs by the deformation-induced nucleation and growth of microvoids around hard particles ( Ref 6 ). Although ductile fracture is not a brittle mechanism, the ductile fracture resistance of tool...
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
... cube depicting normal (perpendicular to respective planes) stresses (σ) and strains (ε). (b) Schematic of a plate with a crack under mode I loading. The cylinder of material in front of the crack tip represents the plastic zone, which varies in size and shape with plate thickness (the plastic zone...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... for the front face correction. Although width correction is not included, Irwin did try to account for the back face and the crack-tip plasticity. Equation 5.25 becomes: (Eq 5.26) K = 1.95 σ a / Q Using a plane-strain plastic zone radius correction factor, Eq 4.7 , an approximate...