Measurement and simulation of strain fields around crack tips under mixed-mode fatigue loading

Hoș, Yiğiter; Vormwald, Michael; Freire, Julliana Cariry Palhano

doi:10.3221/igf-esis.33.06

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…In comparative nonlinear behavior with linear elastic behavior of beams, the von Mises and reaction load exhibited differently (Figs. [10][11][12][13][14]. In both nonlinear and linear cases, with increase crack displacement increased.…”

Section: Nonlinear Analysis Of Beamsmentioning

confidence: 92%

“…A link between the averaged strain energy density (SED) approach and the peak stress method in the case of cracks subjected to mixed mode (I+II) loading, has been investigated [8]. There are several software such as ABAQUS, ADAPCRACK3D, ANSYS and ATENA finite element (FE) used for crack modeling and design of different materials [3][4][5][6][7][9][10][11][12][13][14]. In this paper, the ABAQUS has been used to characterize flexural failure mechanism of beam subjected to the cracking moment and to understand stress transfer in plain concrete during crack development.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation

Namdar¹,

Darvishi²,

Feng³

et al. 2016

Frattura Ed Integrità Strutturale

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The flexural failure of plain concrete beam occurs along with development of flexural crack on beam. In this paper by using ABAQUS, mechanism failure of plain concrete beam under three steps have been simulated. The cracking moment has been analytically calculated and applied on the both sides of the fixed beam, and flexural crack has been simulated on beam. Displacement, von Mises, load reaction, displacementcrack length, von Mises-crack length and von Mises-displacement of beams have been graphical depicted. Results indicated that, the flexural crack governs beam mechanism failure and its effects on beam resistance failure. It has been found that the flexural crack in initial stage it developed slowly and changes to be fast at the final stage of collapsing beam due to reduction of the flexural resistance of beam. Increasing mechanical properties of concrete, collapse displacement is reduced.

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Section: Nonlinear Analysis Of Beamsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation

Namdar¹,

Darvishi²,

Feng³

et al. 2016

Frattura Ed Integrità Strutturale

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“…The crack length is defined as the arc length with the arc measured starting at the crack initiation location. Depending on the loading type, two, or four cracks were observed [10,11].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Moreover, experimental investigations for the 3D mixed mode load to validate existing predicting assumptions need to be further developed [4]. The present paper discusses 2D and 3D formulations for equivalent SIFs for complex mode problems, presented by Erdogan and Sih [9], by Schöllmann et al [3] and by Richard et al [4][5][6], under the light of experiments carried out by Vormwald and his co-workers [10,11]. These experiments used digital image correlation, DIC, to measure full-field displacement and derived data for 3D tested specimens.…”

Section: Introductionmentioning

confidence: 93%

Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation

Vormwald¹,

Hoș²,

Freire³

et al. 2017

Frattura Ed Integrità Strutturale

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This paper focusses on discussing equivalent stress intensity factors and kink angles after a change of mode-mixity from one cycle to the next and when the mode-mixity changes continuously during the fatigue cycles. Thin-walled tubes with through-wall cracks have been loaded by proportional and non-proportional tension and torsion. In the experimental investigation, the region of fatigue crack growth was observed by applying the digital image correlation technique. Data on the variations of the displacement and strain fields during the cycles were acquired and used to determine mixed-mode variations of stress intensity factors associated with opening modes I, II and III. For each specific specimen the crack path was observed in order to relate its curvature -both kinks and continuously developing warped cracks -with the variations of the displacement field and associated stress intensity factors.

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“…From the experimental data acquired by Hos [33] published and analyzed in [28,43,44,48], there is still much more information that can be analyzed such as, SIF, a da/dN vs. ΔK curve, and crack path prediction, for the five types of loading.…”

Section: Thesis Objectivementioning

confidence: 99%

Linear Elastic Fracture Mechanics Analysis of Fatigue Crack Growth Under Complex Loading Using the Digital Image Correlation Technique

Díaz¹

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Fatigue crack propagation assessment includes identifying the crack direction, knowing the equivalent Stress Intensity Factor (SIF) range, determining a crack length growth rate per number of cycles (da/dN), and establishing a crack propagation rule connecting the equivalent SIF and da/dN rate, such as a Paris type of rule. When mixed and non-proportional loading occur, those parameters are not fully understood yet. This thesis deals with some of the variables that influence crack propagation under non-proportional mixed mode loading. The Digital Image Correlation (DIC) technique was used to acquire images of test specimens subjected to cyclic proportional and non-proportional loading. Two types of specimen samples were used. Firstly, two different plate test specimens were tested; a disk compact tension (DCT), and a modified compact tension, C(T). They were subjected cyclic loading inducing crack opening mode I or proportional crack opening modes I and II. Secondly, the previously and elsewhere acquired DIC data for five thin tubes subject to cyclic loading were analyzed. The thin tubes had prefabricated slit-notches from which fatigue cracks initiated and propagated. Those five thin tubes were subjected to different cases of proportional and non-proportional loading. One tube specimen was exposed to axial loading and presented mode I crack opening. The other four were subjected to torsion loading or mixed axial-torsional loading and exhibited all three I, II and III crack-opening modes. The experimentally acquired DIC displacement fields were processed to independently calculate SIF for each existing opening mode using linear elastic fracture mechanics (LEFM) formulations. One formulation used full

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Measurement and simulation of strain fields around crack tips under mixed-mode fatigue loading

Cited by 10 publications

References 10 publications

Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation

Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation

Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation

Linear Elastic Fracture Mechanics Analysis of Fatigue Crack Growth Under Complex Loading Using the Digital Image Correlation Technique

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