Extended FEM modelling of crack propagation using the semi-circular bending test

Lancaster, Ian; Khalid, H A; Kougioumtzoglou, Ioannis A.

doi:10.1016/j.conbuildmat.2013.06.046

Cited by 73 publications

(17 citation statements)

References 24 publications

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“…The given thickness for the edge‐cracked SCB specimens of this research is almost 2.5 times its NMAS, which satisfies the aforementioned requirement. Moreover, review of published papers for fracture toughness study of different types of asphalt concretes indicates that the thickness of SCB specimen varies in the range of 25–50 mm . The thickness of SCB specimen in the current paper was 30 mm, which lies in the aforementioned range.…”

Section: Resultsmentioning

confidence: 54%

See 1 more Smart Citation

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Ameri

Nowbakht

Molayem

et al. 2016

Fatigue Fract Eng Mat Struct

140

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Load‐induced cracking is one of the primary forms of distress in asphalt pavements at intermediate temperatures. Binder modification is a good alternative to promote the cracking resistance of asphalt mixtures. In the current research study, the effects of carbon nanotubes as a binder modifier on the fatigue and fracture performance of asphalt mixtures are investigated. The carbon nanotubes are added at five different percentages ranging from 0.2% to 1.5% to the base binder to study their effects on the fracture resistance and fatigue life of the asphalt mixtures. Using the cracked semi‐circular bend specimen, the critical value of J‐integral (Jc) was obtained for the investigated modified asphalt mixtures. Also, the fatigue behaviour of asphalt mixtures was studied using flexural beam fatigue test specimen. By employing the ratio of dissipated energy change approach, the plateau value of tested mixtures was determined as a measure of fatigue performance. Results showed that the carbon nanotubes can enhance both fracture resistance and fatigue performance of tested asphalt mixtures especially at higher percentages of the carbon nanotube.

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Section: Resultsmentioning

confidence: 54%

“…Moreover, review of published papers for fracture toughness study of different types of asphalt concretes indicates that the thickness of SCB specimen varies in the range of 25-50 mm. 33,40,65,66 The thickness of SCB specimen in the current paper was 30 mm, which lies in the aforementioned range.…”

Section: Frequency Sweep Testmentioning

confidence: 80%

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Ameri

Nowbakht

Molayem

et al. 2016

Fatigue Fract Eng Mat Struct

140

View full text Add to dashboard Cite

show abstract

“…Several laboratory methods were used to evaluate fracture characteristics, including bending tests, tensile and pressure tests, DCT, indirect voltage testing (IDT) and semi-circular flexion test (SCB). SCB engineering is irrelevant, as it is more practical to test laboratory and field samples than conventional beams [32]. In order to develop precise patterns of growth behavior of cracks, a comprehensive program of material characterization and damage should be studied and developed, taking into account the characteristics and categories, as described in [33].…”

Section: Experimental Modelmentioning

confidence: 99%

Investigation of tensile and in-plane shear properties of carbon fiber reinforced composites with and without piezoelectric patches for micro-crack propagation using extended finite element method

et al. 2018

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Mughal, M. (2019). Investigation of tensile and inplane shear properties of carbon fiber reinforced composites with and without piezoelectric patches for microcrack propagation using extended finite element method. AbstractThe smart materials are capable to integrate the remarkabale active functions into a traditional structure of the composites. There is a wide reaseach possibility towards the embedded patches into a composite primary structure. This particular study aims to investigate the effect of the embedded smart materials in a conventional composite laminate. Carbon Fiber Reinforced Composite specimens with and without PZT piezo elements embedded in the structure are studied for Tensile, In-plane Shear and three point bending properties. Previously researched mechanical behaviour and the operational influence of the piezo sensors are sequentially analysed, particularly for the elecetric capacitance during all the categories of testing. The limitations have also been studied into the comparison of the structure with and without the piezoelectric material patches. The extended Finite Element (XFEM) modelling approach has been applied to study the sensorized damage model for the numerical and experimental study. This study also presents simplified and understandable techniques and offers a new direction for the experimental and computational modelling design for the progressive damage, based on the principles of Extended Finite Element Method (XFEM). The extensive experimentation and numerical modelling for interlaminar and intralaminar crack of Carbon Fiber Reinforced Composite CFRCs materials are studied, with and without piezoelectric patches. The experiments and simulations are designed and grouped into categories of load, boundary conditions and types arranged accordingly for fracture, delamination, fiber breakage and matrix crack towards the damage evolution. The dimensions of the specimens and the effects are also studied regarding lengths, thickness and width in multiple categories. The loading cases of tension and the inplane shear are studied for multiple cases for numerical as well as experimental investigation having different orientations and dimensions. The delaminated and fractured mode I and mode II specimen were analysed for the expected and the real time values of strength to figure out the precise values of trends to predict the composite properties.

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“…The idea is to enrich the ordinary finite element spaces with additional degrees of freedom to take into account the presence of crack (Richardson et al 2011). Recently, this approach has been employed using numerical code, ABAQUS, to study the mode I crack propagation of asphalt mixtures using SCB specimens (Lancaster et al 2013;Mahmoud et al 2014). However, a comprehensive study about crack propagation paths in SCB specimen with different crack geometries and boundary conditions using X-FEM has not been reported which is the main objective of this research work.…”

Section: Introductionmentioning

confidence: 99%

Fracture propagation in a cracked semicircular bend specimen under mixed mode loading using extended finite element method

2015

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The semicircular specimen under three-point bending (SCB) has been widely used to investigate mode I, mode II, and mixed mode I/II fracture behavior in brittle rocks. Compared to the other numerical methods, the extended finite element method (X-FEM) models a crack independently of the finite element mesh without any remeshing step in fracture propagation. In this regard, a numerical code called MEX-FEM, based on X-FEM, has been developed for modeling crack propagation in rock material. Since dimensionless stress intensity factors (i.e., Y I and Y II ) in crack modeling of SCB specimen depend on crack length, crack angle, and span ratio, these factors and crack propagation trajectory are determined for different combinations of crack angle, crack length ratio, and span ratio. A very good agreement exists between the calculated factors Y I and Y II in this research work and those reported in the literature. The results show that the values of Y I and Y II increase by increasing the span ratio. The angle in which the pure mode II occurs decreases with increasing of the crack length ratio and it increases when the span ratio increases. The crack growth is along the initial crack when the specimen is subjected to pure mode I (i.e., the crack angle is 0), whereas in mixed mode, the crack is deviated toward the upper loading point. The results of this study demonstrate the utility and robustness of the X-FEM to simulate the crack growth in rock materials.

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Extended FEM modelling of crack propagation using the semi-circular bending test

Cited by 73 publications

References 24 publications

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Investigation of tensile and in-plane shear properties of carbon fiber reinforced composites with and without piezoelectric patches for micro-crack propagation using extended finite element method

Fracture propagation in a cracked semicircular bend specimen under mixed mode loading using extended finite element method

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