Effects of the Measured Noise on the Failure Mechanism of Pre-Cracked Concrete Specimens Under the Loading Modes I, II, III, and IV

Fu, Jinwei; Haeri, Hadi; Yavari, Mojtaba; Sarfarazi, Vahab; Marji, Mohammad Fatehi

doi:10.1007/s11223-022-00362-x

Cited by 9 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and vertical directions are considered, along with the setting of equal distances between the hole boundaries and the circular holes and the model boundary. Thus, seven numerical models, designated NM- [44][45][46]. When the transmitted stress exceeds the bond strength between rock particles, the contact bond between particles is destroyed under the load, and microcracks appear in the numerical model [47][48][49].…”

Section: Mesoparameter Calibration and Numerical Modelsmentioning

confidence: 99%

Effect of the Number and Distribution of Circular Holes on the Damage and Fracture of Limestone Using PFC2D

Liu

et al. 2022

Geofluids

View full text Add to dashboard Cite

The common occurrence of various number and distribution of hole flaws complicates the mechanical behavior and fracture mode of the rock masses that contain them. This study develops seven numerical models of limestone samples with different numbers and distributions of circular hole flaws using 2-D particle flow discrete element code (PFC2D) to investigate their impact on the mechanical properties of limestone while maintaining the same flaws area. In addition, it analyzes the effect of these factors on the mesomechanical features of each model, including the characteristic stress values (peak stress, crack initiation, and damage stress), crack evolution, stress, and displacement field. The results showed that the peak stress, crack initiation, and damage stress of the single-hole model are between those of multihole models. As the arrangement of dip angle increases, the peak stress, crack initiation, and damage stress of models with the same number of multihole flaws exhibit a V-shaped change. The characteristic stress values are the largest when the holes are vertically aligned. Model differences in crack development path, shape, and number, as well as stress concentration area and failure mode, are primarily due to the number and distribution of holes. The circular holes are arranged at approximately 45°, and the greater the number of defects, the more likely the model is to fail. The study’s findings can provide support and reference for the research system of deformation and failure of rock mass with hole flaws.

show abstract

Section: Mesoparameter Calibration and Numerical Modelsmentioning

confidence: 99%

Effect of the Number and Distribution of Circular Holes on the Damage and Fracture of Limestone Using PFC2D

Liu

et al. 2022

Geofluids

View full text Add to dashboard Cite

show abstract

“…Also, Mortazavi et al have stated that the selection of inter-atromic potential playing a crucial the classical MD simulation [22]. Through the experimentation, Fu et al have confirmed that the existence of crack on concrete and many other materials leads to invoke greater impact on its material characteristics [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Impact of nano crack and loading direction on the tensile features of FeCr alloy: a molecular dynamics analysis

Gowthaman,

Jagadeesha

2024

Funct. Compos. Struct.

View full text Add to dashboard Cite

The existence of cracks and variations in loading direction has invoked greater modifications in the material properties. In this work, the tensile features of cracked and non-cracked FeCr polycrystals have been analyzed under numerous temperatures (300 K, 500 K, 700 K, and 900 K) and loading directions (parallel and normal to the crack cross-sectional directions) through molecular dynamics and it is originated that temperature has raised a higher impact on the tensile features trailed by the existence of crack and loading directions, owing to the formation of larger kinetic energy amidst the atoms. The existence of crack offers a moderate impression on the tensile behavior followed by the loading direction, due to its dominant impact on the tensile behavior through greater stress concentrations. Additionally, it is stated that the greater temperature along with the existence of crack and loading along normal to the crack cross section offers greater reductions in the tensile features of FeCr polycrystal, owed to the interactive effect of larger kinetic energy and discontinuity among atoms. Furthermore, the shear strain and displacement contour map and materials feature also confirm a similar occurrence which leads to altering its material behavior.

show abstract

“…Haeri et al [9] proposed a new method to measure the fracture toughness of rock samples by using the central crack horseshoe disk (CCHD) method for radial compression tests, and observed that the crack initiation and propagation patterns between the experiment and numerical simulation are very consistent. Fu et al [10] studied the damage location and convergence curve based on diferential evolution algorithm for precracked concrete specimens with central cracks of diferent dip angles, and considered the noise efect.…”

Section: Introductionmentioning

confidence: 99%

Study on the Stage Characteristics of Noise Dispersion in the Deformation Evolution of Red Sandstone

Song

Yuan

Zhang

et al. 2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

The uniaxial compression experiment of red sandstone is observed simultaneously by using acoustic emission and digital speckle correlation methods. The deformation evolution of red sandstone is divided into microfracture random expansion stage, deformation localization stage, subinstability stage, and instability failure stage. Green’s function and dispersion curve of each stage are obtained from the noise data picked up by acoustic emission equipment, and the dispersion characteristics of each evolution stage are analyzed. The results show the following: (1) In the stage of random propagation of microcracks, the noise in the low frequency range passes through at a higher phase velocity, the phase velocity changes periodically, the correlation coefficient is high at the initial time, and the variation trend of frequency dispersion curve is relatively consistent. (2) In the deformation localization stage, the frequency range without zero phase velocity moves to the high frequency range, and the phase velocity changes periodically. (3) In the subinstability stage, dense phase velocity zeros appear on the dispersion curve image, the dispersion curve tends to be disordered, various indicators change obviously, and the correlation coefficient decreases rapidly. (4) In the unstable failure stage, the fracture evolution is completed, and the variation trend of each index of the frequency dispersion curve is consistent. (5) The size and difference of the sensitive kernel function of the two layers are related to the evolution region of the fracture. The sensitivity kernel value of the medium layer where the fracture evolves is high, and the longer the evolution time, the greater the difference.

show abstract

Effects of the Measured Noise on the Failure Mechanism of Pre-Cracked Concrete Specimens Under the Loading Modes I, II, III, and IV

Cited by 9 publications

References 16 publications

Effect of the Number and Distribution of Circular Holes on the Damage and Fracture of Limestone Using PFC2D

Effect of the Number and Distribution of Circular Holes on the Damage and Fracture of Limestone Using PFC2D

Impact of nano crack and loading direction on the tensile features of FeCr alloy: a molecular dynamics analysis

Study on the Stage Characteristics of Noise Dispersion in the Deformation Evolution of Red Sandstone

Contact Info

Product

Resources

About