Stress intensity factor analysis of through thickness effects

Garcia-Manrique, J.; Camas, D.; López-Crespo, P.; González-Herrera, Antonio

doi:10.1016/j.ijfatigue.2011.12.012

Cited by 47 publications

(30 citation statements)

References 43 publications

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“…This has been done evaluating SIF along the thickness in fracture problem. Preliminary results were recently published . Based on 2‐D and 3‐D models, calculated applying a single load to the crack, two different methods were evaluated to obtain numerically the SIF.…”

Section: Introductionmentioning

confidence: 99%

Study of the stress intensity factor analysis through thickness: methodological aspects

Garcia-Manrique

Camas

González-Herrera

2017

Fatigue Fract Eng Mat Struct

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This paper is focused on the methodological aspects of the numerical study of stress intensity factor (SIF) evolution through thickness. The work evaluates the modelling of an Al‐alloy 2024‐T351 CT specimen under mode I nominal loading in fracture. No plastic wake effect is introduced to separate the influence of plasticity‐induced crack closure near the surface. Numerical models have shown the complexity 3‐D behaviour in the vicinity of the crack front and finite element methods (FEM) are widely used in these problems with interesting results. However, there is a lack of literature support in many simplifying assumptions. In previous studies, authors have analysed some issues as the evolution of the plastic zone, the crack closure stress or the SIF. The current work attempts to describe and justify the key aspects of the methodology developed to address these problems by the FEM. A huge effort has been made to study main parameters involved and their influence in the results, especially in order to properly capture the SIF distribution along the thickness. Recommendations about mesh density are provided, and the main procedures to obtain K are discussed.

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Section: Introductionmentioning

confidence: 99%

Study of the stress intensity factor analysis through thickness: methodological aspects

Garcia-Manrique

Camas

González-Herrera

2017

Fatigue Fract Eng Mat Struct

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“…But since this is a nonlinear analysis, a better accuracy at less expense is obtained if a fine mesh of linear elements is used rather than a comparable coarse mesh of quadratic elements [29]. Besides, this kind of element has been employed due to the huge experience obtained by the present authors in previous works in which the accuracy of the model has been analysed [17,[30][31][32]. The plastic zone size is the scale reference to relate to the minimum element size.…”

Section: Fea Modelling Methodologymentioning

confidence: 99%

“…Hence, the yielded area at the surface is equal to the yielded area in the mid-plane in all the applied load range for this case. This behaviour may be explained by the corner point singularity and the decrease of the stress intensity factor as a corner point is approached [32].…”

Section: Plastic Zone Sizementioning

confidence: 99%

“…With a straight crack front, it has been argued [32] that, as a consequence of the elastic-plastic strain field resulting from the strong different constraint conditions at the interior and at the exterior of the crack tip, a smaller K value is present near the surface. It is supported by the evidence that a smaller plastic zone than the expected value with plane stress condition is obtained at the surface (as also shown in Figs.…”

Section: Plastic Zone Sizementioning

confidence: 99%

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Crack front curvature: Influence and effects on the crack tip fields in bi-dimensional specimens

Camas

Garcia-Manrique

González-Herrera

2012

International Journal of Fatigue

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“…For thin components, the surface behaviour is normally representative of the T complete behaviour [7]. However, for many engineering components, the surface may not be at all representative of the majority of the bulk of the material [8,9] and not describe accurately the complete component behaviour [10,11]. Intense hard X-ray beams at synchrotron facilities now give us the possibility of probing the bulk of engineering materials both in terms of the geometry and in terms of elastic strain.…”

Section: Introductionmentioning

confidence: 99%

Mid-thickness studies of the stress intensity factor in the bulk of bainitic steel

López-Crespo

Vazquez-Peralta

Simpson³

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. The current work aims at estimating the stress intensity factor deep inside the bulk from elastic strain data measured by synchrotron X-ray diffraction. Key features affecting the evaluation of the stress intensity factor are the number of terms in the analytical model describing the crack tip field, the extension and position of the area of interest of the experimental data, the effect of the experimental data collected within the plastic zone and the number of elastic strain data points used. Here a parametric study of these features is presented in terms of their influence for the stress intensity factor determination. It was found that 3 or 4 terms in Williams' expansion is often sufficient; the data should be collected from across the full range of angles around the crack tip; and the number of points/number of terms should be greater than 40.

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Stress intensity factor analysis of through thickness effects

Cited by 47 publications

References 43 publications

Study of the stress intensity factor analysis through thickness: methodological aspects

Study of the stress intensity factor analysis through thickness: methodological aspects

Crack front curvature: Influence and effects on the crack tip fields in bi-dimensional specimens

Mid-thickness studies of the stress intensity factor in the bulk of bainitic steel

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