Dynamic photoelastic investigation of two pressurized cracks approaching one another

Simha, K. R. Y.; Fourney, W.L.; Barker, Donald E.; Dick, Richard D.

doi:10.1016/0013-7944(86)90190-6

Cited by 10 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ÿnal intersection of the two cracks results in the ejection of a small elliptical piece of material. This crack interaction phenomenon was experimentally observed by Sinha et al [56]. Numerical simulations were also reported in the literature (Swenson [57], Liebowitz [29], and Marzougui [19]).…”

Section: Validation Of the Pseudo 3d Fracture Modelsmentioning

confidence: 58%

Development of the DYNA3D simulation code with automated fracture procedure for brick elements

Tabiei

Jin

2003

Numerical Meth Engineering

View full text Add to dashboard Cite

SUMMARYNumerical simulation of cracked structures is an important aspect in structural safety assessment. In recent years, there has been an increasing rate of development of numerical codes for modelling fracture procedure. The subject of this investigation is implementing automated fracture models in the DYNA3D non-linear explicit ÿnite element code to simulate pseudo 3D crack growth procedure. The implemented models have the capabilities of simulating automatic crack propagation without user intervention. The implementation is carried on solid elements. The methodology of implementing fracture models is described. An element deletion-and-replacement remeshing procedure is proposed for updating the explicit geometric description of evolving cracks. Fracture parameters such as stress intensity factors, energy release rates and crack tip opening angle are evaluated. The maximum circumferential stress criterion is used to predict the direction of crack advancement. Seven crack problems are presented to verify the e ectiveness of the methodology. Mesh sensitivity and loading rate e ects are studied in the validation of the presented procedure.

show abstract

Section: Validation Of the Pseudo 3d Fracture Modelsmentioning

confidence: 58%

Development of the DYNA3D simulation code with automated fracture procedure for brick elements

Tabiei

Jin

2003

Numerical Meth Engineering

View full text Add to dashboard Cite

show abstract

“…Figure 17 shows the specimen geometry along with an FE model with a fine mesh used in the simulation. Figure 18 shows a couple of pictures taken from the experimental reports of Simha et al 49 . and Eremenko et al 50 .…”

Section: Resultsmentioning

confidence: 99%

Automated dynamic fracture procedure for modelling mixed‐mode crack propagation using explicit time integration brick finite elements

Aminjikarai

Tabiei

2009

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

A B S T R A C T Several fracture codes have been developed in recent years to perform analyses of dynamic crack propagation in arbitrary directions. However, general-purpose, commercial finiteelement software which have capabilities to do fracture analyses are still limited in their use to stationary cracks and crack propagation along trajectories known a priori. In this paper, we present an automated fracture procedure implemented in the large-scale, nonlinear, explicit, finite-element code DYNA3D which can be used to simulate dynamic crack propagation in arbitrary directions. The model can be used to perform both generationand application-phase simulations of self-similar as well as non-self-similar dynamic crack propagation in linear elastic structures without user intervention. It is developed based on dynamic fracture mechanics concepts and implemented for three-dimensional solid elements. Energy approach is used in the model to check for crack initiation/propagation. Dynamic energy release rate and stress intensity factors are determined from far-field finite-element field solutions using finite-domain integrals. Fracture toughness is input as a function of crack-tip velocity, and when the criterion for crack growth is satisfied, an element deletion-and-replacement re-meshing procedure is used along with a gradual nodal release technique to update the crack geometry and model the crack propagation. Direction of crack propagation is determined using the maximum circumferential stress criterion. Numerical simulations of experiments involving non-self-similar crack propagation are performed, and results are presented as verification examples.

show abstract

“…The crack-tips of the microcracks seem unwilling to approach each other head-on, and they deviate from each other (marked at step 26-28). This was discussed by several researchers in 1980s (See for instance Simha et al 1986). The initial stage of the minimum macrocrack propagation is called crack initiation (See for example Park andBobet 2010, andLi et al 2010).…”

Section: Microcracks Evolution Picturesmentioning

confidence: 93%

Microcracks size growth prediction based on microdefects nucleation number

Wang

Mao

et al. 2013

Int J Fract

View full text Add to dashboard Cite

The mechanical reason for rock and concrete failure is trans-scale fracture, which can be divided into three phases: (1) microcrack evolution, (2) macrocrack nucleation, (3) macrocrack growth and run-through. Using the idea that a microcrack could be regarded as a well-organized aggregation of nucleated microdefects, the size growth model of the largest microcrack based on the accumulated number of microdefect nucleation is established. In order to test the validity of the model, trans-scale fracture of a plate made of heterogeneous material is numerically simulated to display the microcrack's evolution. Statistical analysis of the number and sizes of the microcracks indicates that the predicted size of the largest microcrack according to the model is in close agreement with the measured crack size prior to peak stress, but not at all close to the measured values after the peak. At the end of the paper, some remaining problems are proposed for the further work.

show abstract

Dynamic photoelastic investigation of two pressurized cracks approaching one another

Cited by 10 publications

References 14 publications

Development of the DYNA3D simulation code with automated fracture procedure for brick elements

Development of the DYNA3D simulation code with automated fracture procedure for brick elements

Automated dynamic fracture procedure for modelling mixed‐mode crack propagation using explicit time integration brick finite elements

Microcracks size growth prediction based on microdefects nucleation number

Contact Info

Product

Resources

About