Automatic crack propagation tracking

Shephard, Mark S.; Yehia, Nabil A.B.; Burd, Gary S.; Weidner, Theodore J.

doi:10.1016/0045-7949(85)90070-7

Cited by 57 publications

(11 citation statements)

References 13 publications

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“…The advantage of the MFEM, implemented through the ABAQUS and PYTHON, is that it is based on the FEM using user defined subroutine, combining the GMTS criterion with the interaction integral method. During the simulation (Figure 4), the propagation of the studied crack is obtained by the elongation of many small cracks and its successful implementation also depends on the overall remeshing technique [47,48] and the method of incremental crack propagation [21,49]. In addition, considering the influence of mesh size h and increment of the crack propagation length i on the calculation accuracy, both h and i adopted the recommended values (generally, half of the internal parameters is chosen as the h and h/2 ≤ i < h) [19,25,49].…”

Section: Resultsmentioning

confidence: 99%

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

et al. 2021

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This paper concerns the effect of friction on crack propagation for the centrally cracked Brazilian disk under diametric forces by using a modified finite element method. It shows that the mode II stress intensity factor decreases obviously with the increase of friction after the crack is closed, while friction has no influence on the stress intensity factor of mode I and T-stress. Meanwhile, there are some significant influences on the crack propagation due to the change of the friction after the crack is closed with the appropriate loading angle and relative length of the crack. When T-stress is positive, the effect of friction becomes obvious and the crack propagation angle increases with a lager friction coefficient. With increasing the friction, the deviation for the crack propagation trajectory increases and the curvature of path decreases, which may lead to the change of crack type. Additionally, the larger relative crack length can amplify the effect of friction, which is similar to the loading angle.

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Section: Resultsmentioning

confidence: 99%

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

et al. 2021

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“…3b). The crack could be then simulated either by introducing a discrete interface or an additional set of nodes [47,48,49,50,51,52,53] (see Fig. 6).…”

Section: Discrete Crack Approachesmentioning

confidence: 99%

Challenges, Tools and Applications of Tracking Algorithms in the Numerical Modelling of Cracks in Concrete and Masonry Structures

Saloustros

Cervera

Pelà

2018

Arch Computat Methods Eng

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The importance of crack propagation in the structural behaviour of concrete and masonry structures has led to the development of a wide range of finite element methods for crack simulation. A common standpoint in many of them is the use of tracking algorithms, which identify and designate the location of cracks within the analysed structure. In this way, the crack modelling techniques, smeared or discrete, are applied only to a restricted part of the discretized domain.This paper presents a review of finite element approaches to cracking focusing on the development and use of tracking algorithms. These are presented in four categories according to the information necessary for the definition and storage of the crack-path. In addition to that, the most utilised criteria for the selection of the crack propagation direction are summarized.The various algorithmic issues involved in the development of a tracking algorithm are discussed through the presentation of a local tracking algorithm based on the smeared crack approach. Challenges such as the modelling of arbitrary and multiple cracks propagating towards more than one direction, as well as multidirectional and intersecting cracking, are detailed. The presented numerical model is applied to the analysis of small-and large-scale masonry and concrete structures under monotonic and cyclic loading.

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“…The prediction of crack growth for 3D models, under various modes of loading, has been made in many studies for a number of years. [1][2][3][4] In most of the above cases the prediction techniques were limited to crack growth within a small region of the model. Crack growth in real large-sized structures, has also been analyzed by many researchers.…”

Section: E a R L I E R S T U D I E S O N T H R E E -D I M E N S I O Nmentioning

confidence: 99%

Experimental and numerical studies on dynamic crack growth in layered slate rock under wedge impact loads: part II – non‐plane strain problem

Alam

Munaswamy

Swamidas

2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T Dynamic crack propagation in non-plane strain (or 3D) slate blocks under wedge impact loads was investigated numerically in this part of the paper. A parabolic-shaped crack trajectory was taken into consideration to model the crack propagation in slate blocks for analyzing the impact splitting of layered slate rock. Major and minor axes of the parabola were determined from the condition of equal mode I stress intensity factors (SIFs) along the crack front. Mode I SIFs were determined for experimental breaking loads for each increment of crack growth in a manner similar to that mentioned in part I of this paper. These values were compared with the plane strain material fracture toughness value obtained from experimental studies and very good agreement was obtained between them, for the case of actual load applied on the specimen. Numerical analysis of a field problem, i.e., separation of a large-sized slate slab from the rock strata in a slate quarry using wedge impacting, was also carried out in this paper. It can be observed that a large magnitude of load is required to break large-sized slate blocks; but this load is applied through a number of smaller load-capacity actuators-in-parallel, requiring large power capacity for the hydraulic pumps. However, this required power could be reduced considerably if the load applied on the line of hydraulic actuators is cascaded across the (line of) actuators (starting from centrally placed actuators) with a small time delay (equal to the initial crushing time in slate rock).These studies were motivated by the need to estimate theoretically the required in-plane impact loads for splitting layered slate rocks; in addition, the design of the necessary machinery/equipment to apply that load was also required in this study. The experimental testing of large-scale specimens will generally be beyond the reach of a researcher working in a medium-sized research laboratory. The other way to do the same is to verify and establish a numerical methodology from the results of small-scale experimental investigations and then to apply the same numerical procedure to compute the approximate breaking loads for large-sized slate blocks. From these computed breaking loads, the field equipment can be designed and fabricated.Two-dimensional and their equivalent plane strain (3D) finite-element analyses of the dynamic crack propagation of slate blocks, broken experimentally under plane strain conditions (transverse length of the block was equal to the transverse length of the wedge), were reported in part I of this paper. However, the prevalence of plane strain conditions for a rock breaking process is rather a rare event. Generally the loading area, or the extent of line load, would be much smaller than the length of the slate rock over which the failure of slate block is to be initiated. This leads to a 3D loading condition. Therefore, it is necessary to analyze large-sized slate blocks numerically as well. In part II of this paper, laboratory test results, and numerical analy...

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Automatic crack propagation tracking

Cited by 57 publications

References 13 publications

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

Challenges, Tools and Applications of Tracking Algorithms in the Numerical Modelling of Cracks in Concrete and Masonry Structures

Experimental and numerical studies on dynamic crack growth in layered slate rock under wedge impact loads: part II – non‐plane strain problem

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