Showing papers in "Engineering Fracture Mechanics in 2020"

TL;DR: Presenting the state-of-the-art developments in mesoscale modelling of concrete considering different analysis methods such as continuum Finite Element Modelling (FEM), Lattice Element Method (LEM), Rigid Body Spring Method (RBSM), Discrete Element method (DEM) and Lattices Discrete Particle Method (LDPM) is the focus of this review paper.

TL;DR: In this article, a review on the innovative methods of utilizing the acoustic emission (AE) parameters in characterizing Fiber Reinforced Plastics (FRPs) is presented, which is structured into different sections based on different AE descriptors used in characterising FRPs.

TL;DR: In this paper, the fracture characteristics of fine-grained granite were examined for a potential geothermal-energy reservoir, and the results indicated that thermal cycling leads to decreased fracture toughness (Keff), absorbed energy (U), longitudinal wave velocity (Pv), and increased permeability (K).

TL;DR: In this paper, a probabilistic model for deducing fatigue life distribution of notched components is established by coupling the Weibull distribution with the theory of critical distance, and the influence of size effect on critical distance values and predicting performance is characterized by two strategies, i.e., average approach and highly stressed volume-based approach.

TL;DR: It was found that a combined long short-term memory - hidden Markov model results in more accurate solution than only using long short -term memory, especially in the case of the dataset that is lack of information.

TL;DR: In this paper, the authors investigated the fracture toughness of asphalt concretes reinforced with carbon and kenaf fibers and found that the effect of carbon fibers is superior to that of the kenaaf fibers.

TL;DR: In this paper, an innovative technique called digital image correlation (DIC) was used to trace the fracture process, and important fracture parameters, such as the FPZ size and critical opening displacement, were measured by full-field displacement and strain measurement.

TL;DR: In this paper, the effect of cyclic wetting-drying cycles on the fracture behavior of sandstone was investigated, where notched semi-circular bending tests were performed on sandstone samples after every ten cycles under both quasi-static and dynamic loading conditions.

TL;DR: In this paper, the authors developed a methodology for intelligent mission planning using the digital twin approach, with the objective of performing the required work while meeting the damage tolerance requirement, which includes the quantification of the uncertainty in diagnosis, prognosis, and optimization, considering both aleatory and epistemic uncertainty sources.

TL;DR: In this paper, a coupled 3D hydraulic fracture propagation model was proposed to investigate the influence of shear displacement discontinuities along bedding planes on fracture height growth in Longmaxi shale formation.

TL;DR: In this article, the effect of in-plane raster orientation on the tensile and fracture strengths of poly-lactic acid (PLA) samples made by fused deposition modeling technique was investigated.

TL;DR: In this article, the authors present a comprehensive workflow to model hydraulic fracture by accounting for interactions with numerous crosscutting natural fracture or joint sets, as well as the effect of temporary plugging in opened fractures.

TL;DR: In this paper, three kinds of fibers, including glass fibers, basalt fibers and steel fibers, were selected to investigate their influences on the low temperature properties and cracking resistance of asphalt mixtures.

TL;DR: In this article, the effect of the aspect ratio of the fillers on the fracture toughness of the glass-filled epoxy composites under impact loading was discussed and the potential of using Artificial Neural Networks (ANNs) in predicting the shape of the filler shape on fracture behavior was studied.

TL;DR: In this paper, a semi-circular three-point bending test was conducted on four groups of granite specimens treated at different temperatures, and the results showed that after treatment at 20°C-900°C, the tensile strength of rocks all declined with increasing temperature.

TL;DR: In this article, a series of one-dimensional coupled static and dynamic loading tests were performed by using a modified split Hopkinson pressure bar, and the results showed that the dynamic strength of intact specimens and specimens with a cavity decreases with the increase of axial static pressure under 20-70% of the uniaxial compressive strength (UCS).

TL;DR: In this article, the fracture process zone (FPZ) of dam concrete under different loading rates is measured, and the formation process of FPZ is studied by applying digital image correlation (DIC) and acoustic emission (AE) technique.

TL;DR: In this paper, a 3D meso-scale numerical approach was used to analyze the effect of aggregate contents and MAS on dynamic mechanical properties and the corresponding dynamic size effect of concrete.

TL;DR: In this article, the acoustic emission (AE) signals released during rock fracture process can reflect the crack development and damage in the rock in real-time, which is unsuited to in-situ monitoring and early warning.

TL;DR: In this article, a model for fatigue fracture in ductile materials, e.g., metals, is presented, which combines the phase-field method for brittle fracture with a classic durability concept.

TL;DR: In this article, the authors investigated the full-field displacement and strain fields of asphalt concrete under semi-circular bending (SCB) through the stereo-digital image correlation (stereo-DIC) technique.

TL;DR: In this paper, a method to determine crack tip position and fracture process zone (FPZ) in concrete was proposed based on Bažant Crack Band Model (CBM) and digital image correlation (DIC) technique.

TL;DR: In this paper, the authors used the notched semi-circular bend (NSCB) method to perform dynamic fracture tests on rock specimens irradiated by microwaves with different durations and found that the dynamic initiation fracture toughness increases linearly with the loading rate, and the microwave irradiation has a significant weakening effect.

TL;DR: In this paper, a peridynamic model using adaptive grid refinement is developed to investigate crack propagation in ceramics, which allows to increase the resolution of analysis only in the critical zones.

TL;DR: In this article, the dynamic fracture toughness of silica filled polymer composites subjected to impact loading was studied using three different loading rates corresponding to different pulse shaper conditions, and the results showed that loading rate was the most important factor in predicting the stress intensity factor followed by shear wave speed, longitudinal wave speed and volume fraction of the fillers used.

TL;DR: The results show that through the framework, crack growth model can be updated to have a lower uncertainty, and future crack growth and reusable life can be predicted more accurately using the improved model.

TL;DR: In this paper, the authors used three-point bending test method combined with digital image correlation (DIC) and acoustic emission (AE) technology to obtain the crack propagation characteristics of rocks under post-peak cyclic loading.

TL;DR: In this paper, a diffuse framework for modeling cracks in heterogeneous media is presented, where interfaces are depicted by static phase-fields and another phase-field is used to describe the crack evolution in a regularized manner.

TL;DR: In this paper, an improved discrete element method (DEM) was used for concrete to predict its strength, brittleness and fracture, and a phase concrete description was used to explicitly take its heterogeneity into account.

TL;DR: In this article, the impact of incremental stress amplitude (ISA) on fracture evolution, energy conversion and crack network pattern at rock bridge segment was investigated on granite containing two pre-existing flaws.