The assessment of defects in structures of strain hardening material

Ainsworth, R.A.

doi:10.1016/0013-7944(84)90096-1

Cited by 420 publications

(130 citation statements)

References 7 publications

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“…[13,49] The HEAC properties in Figure 14, from elastoplastic K J analysis of a small specimen, are quantitatively relevant to a structure under elastic loading, following the J-integral approach. [58,60,66,67,[76][77][78] To verify this assertion, it is necessary to demonstrate K and J dominance of crack tip mechanics. [52] K dominance is established by comparing the uncracked SENT ligament (W-a) and plane strain plastic zone diameter (estimated using the Ramberg-Osgood flow properties for Monel K-500) for the deepest crack and high-elastic K of 50 MPaÖm.…”

Section: Mpa√mmentioning

confidence: 99%

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Gangloff

Burns

et al. 2014

Metall Mater Trans A

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Hydrogen environment-assisted cracking (HEAC) of Monel K-500 is quantified using slow-rising stress intensity loading with electrical potential monitoring of small crack propagation and elastoplastic J-integral analysis. For this loading, with concurrent crack tip plastic strain and H accumulation, aged Monel K-500 is susceptible to intergranular HEAC in NaCl solution when cathodically polarized at À800 mV SCE (E A , vs saturated calomel) and lower. Intergranular cracking is eliminated by reduced cathodic polarization more positive than À750 mV SCE . Crack tip diffusible H concentration rises, from near 0 wppm at E A of À765 mV SCE , with increasing cathodic polarization. This behavior is quantified by thermal desorption spectroscopy and barnacle cell measurements of hydrogen solubility vs overpotential for planar electrodes, plus measured-local crevice potential, and pH scaled to the crack tip. Using crack tip H concentration, excellent agreement is demonstrated between measurements and decohesion-based model predictions of the E A dependencies of threshold stress intensity and Stage II growth rate. A critical level of cathodic polarization must be exceeded for HEAC to occur in aged Monel K-500. The damaging-cathodic potential regime likely shifts more negative for quasi-static loading or increasing metallurgical resistance to HEAC.

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Section: Mpa√mmentioning

confidence: 99%

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Gangloff

Burns

et al. 2014

Metall Mater Trans A

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“…It can therefore be applied in cases where only linear elastic solutions exist and the Ramberg-Osgood approximation is not suitable. However, since this method relies on certain assumptions of structural behavior in the inelastic range, proper definition of the reference stress is necessary to assure an accurate solution 12 .…”

Section: Reference Stress Methodsmentioning

confidence: 99%

“…This trend becomes more pronounced as the stress range and plastic contribution to AJf increase. Such behavior can be explained by the dependence of the function hi on the hardening exponent n. The agreement between the two methods can be improved by modifying the reference stress equation 12 .…”

Section: Reference Stress Methodsmentioning

confidence: 99%

High-temperature flaw assessment procedure: Interim report

Ruggles¹,

Takahashi²,

Ainsworth³

1989

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“…For example, a reference load, P o , has been combined with the normalised (h) functions in the EPRI method [19] to define J; for details see [20][21]. The reference load has also been chosen so that fully plastic solutions for power-law materials (such as those in [19]) for different values of hardening exponent n are insensitive to n (Ainsworth [22], Kim et al [23]). The ability to make power-law solutions insensitive to n has been used to justify use of classical limit load solutions as reference loads since these correspond to n→∞.…”

Section: Determination Of the Reference Load F Ymentioning

confidence: 99%

Proposed extension of the SINTAP/FITNET thin wall option based on a simple method for reference load determination

Zerbst¹,

Pempe²,

Scheider³

et al. 2009

Engineering Fracture Mechanics

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A "correct" limit or yield load is an essential element of flaw assessment procedures of the R6 or SINTAP type. In the present paper the authors propose a definition of this quantity which is based on the SINTAP Option 3 failure assessment function. This "reference load" can be determined for any component geometry by finite element analyses. The method is applied to two kinds of thin walled structures (notched plates and curved stiffened panels) this way extending the existing thin wall module of SINTAP.

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The assessment of defects in structures of strain hardening material

Cited by 420 publications

References 7 publications

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

High-temperature flaw assessment procedure: Interim report

Proposed extension of the SINTAP/FITNET thin wall option based on a simple method for reference load determination

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