The use of notch stress intensity factor as a fatigue crack initiation parameter

Boukharouba, Taoufik; Tamine, Tawfik; Niu, Li; Chehimi, C.; Pluvinage, G.

doi:10.1016/0013-7944(94)00242-a

Cited by 111 publications

(58 citation statements)

References 6 publications

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“…Boukharouba et al (1995) and Pluvinage (1997) achieved good results in elastic domain and then extended the analysis to elastic-plastic material behaviour. Qilafku (2001) reveal good progress in determining the NSIF in the ''elastoplastic'' mode I.…”

Section: Computing the Notch Stress Intensity Factor In Mode Imentioning

confidence: 99%

Experimental–Numerical Characterization of the Fracture Behaviour of P264GH Steel Notched Pipes Subject to Internal Pressure

Moustabchir

Azari

Hariri

et al. 2017

Iran J Sci Technol Trans Mech Eng

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The rupture phenomenon of a mechanical structure requires critical consideration, because of its safety constructions. A detailed experiment of material features as well as the Young's modulus, yield strength, material toughness or fracture resistance provides useful information to predict the life integrity of a pipe structure. This paper presents the most accurate experimental techniques for characterization of a pipe-like structure to assess its reliability. Standard traction tests, dynamic Charpy tests and pressure tests were performed to envisage the crack propagation progress. Detailed information on fracture process was obtained by a robust numerical approach using the finite element method.

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Section: Computing the Notch Stress Intensity Factor In Mode Imentioning

confidence: 99%

Experimental–Numerical Characterization of the Fracture Behaviour of P264GH Steel Notched Pipes Subject to Internal Pressure

Moustabchir

Azari

Hariri

et al. 2017

Iran J Sci Technol Trans Mech Eng

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“…Many scientists were engaged in the solution of problems concerning cracking and fracture of load carrying metal structures of machinery, with the use of the finite element method as well [3][4][5][6][7]. In this study, finite element models of metal structures with box-section design were built to calculate the stresses in the vicinity of the crack tip and SIF in the automated design system and in the analysis of automated workstations WinMachine.…”

Section: Simulation Of the Stress And Strain State At The Tip Of The mentioning

confidence: 99%

Methods of determining the margin of cyclic crack resistance of metal structures for hoisting machinery

Antsev

Tolokonnikov

Воробьев

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In the course of manufacturing and operation, there can appear cracks in loadcarrying metal structures which are hard to be detected till a definite moment. That is why in the course of designing metal structures, it is necessary to ensure their durability during possible existence of cracks up to the next routine inspection of a structure. For the prognostication of the durability of a structure with a crack, a research of coefficients of stress intensity on end-element models with crack-like defects of different length is carried out. As a result of this, a procedure for the definition of crack-resistance resource allowing the supposition of safe operation of a metal structure with a crack within the limits of recurrent routine works is developed. IntroductionBoth technological and fatigue cracks can appear in parts of load carrying metal structures in hoisting machines during production or operation processes. The resistance of metal to structure crack propagation is called fracture toughness.The known concept of secure damage is based on the assumption that in any metal structure, even in new, there are always defects that may remain long undetected. Dimensions of detected defects are determined by resolution of applicable testing aids. All defects which are beyond the scope of testing aids remain undetected and, when present in the metal structure, they are potentially dangerous for metal structure operation.To assess the vitality and the remaining life of metal structures, as well as to assess the impact of technological and operational defects on their load-bearing capacity, we must have a calculation device to predict behavior of metal structures with cracks under operational loads, which includes methods of fracture mechanics using the stress intensity factor (SIF) as the main characteristics of the stress and strain state of the material near the crack tip. The value of SIF may be found, for example, by reference data [1,2] or by numerical methods. However, SIF guides do not contain practically any solutions to the cracks in the spatial objects of box-section typical for parts of metal structures of hoisting machines. In the paper presented this problem is solved on the basis of the end-element modeling of structures with crack defects with the purpose of the assessment of metal structure durability at the stage of designing.

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“…determined NSIFs pad (or, in the case of bigger tasks, spring plasticdetermined by stress the notch or factors of intensity strain) may describe the voltages of the region of toe of weld, quantifying the intensity of the distributions of stress on the basis of conditions of orders of the Williams solution (1952). NSIF approach was originally proposed to estimate the stage of initiation of the cracks (Boukharouba et al, 1995;Verreman and Nie, 1996), but only later was demonstrated later that NSIFs parameters are able to predict the service life of the fatigue of the welded connections (Livieri and Lazzarin, 2005;Lazzarin and Tovo, 1998;Atzori et al, 1999). In fact, a large quantity of life to fatigue for welded structural is spent at the depth of the crack in the short term, within the region governed by the singularities V-notch: Therefore, nucleation and increase the short cracks are dependent on the distributions of stress present in the component Nesfari-stopper.…”

Section: Introductionmentioning

confidence: 99%

A Review of the Fatigue Strength of Load Carrying Shear Welded Joints

Berto¹,

Gagani²,

Petrescu³

et al. 2017

American Journal of Engineering and Applied Sciences

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In the study it is shown an overview of the latest results of two types of joints of the load carrying welded shear. Tests of fatigue have been carried out on the two solutions specific design features proposed and with the aim of improving the resistance of the joints under cycling loading. By hiring the 3D models, was determined Strain Energy Density (SED), in a volume of control which surrounds the lowest point of interest. All of the experimental results have been presented in short. The synthesis shows that all data are within the range of the scattering of the proposed previously in the specialized literature for steel construction welded.

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The use of notch stress intensity factor as a fatigue crack initiation parameter

Cited by 111 publications

References 6 publications

Experimental–Numerical Characterization of the Fracture Behaviour of P264GH Steel Notched Pipes Subject to Internal Pressure

Experimental–Numerical Characterization of the Fracture Behaviour of P264GH Steel Notched Pipes Subject to Internal Pressure

Methods of determining the margin of cyclic crack resistance of metal structures for hoisting machinery

A Review of the Fatigue Strength of Load Carrying Shear Welded Joints

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