Article
Mechanics
Penghai Deng, Quansheng Liu, Xing Huang, Qi Liu, Hao Ma, Weiwei Li
Summary: The study proposed a method to measure the normal contact stiffness and found that an alpha value of 0.1448 is optimal for simulating rock crack propagation under different conditions. Proper selection of the alpha value can improve the reliability of FDEM numerical simulation results.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
V. Collado Cipres, E. L. Dalibon, J. Garcia, L. Escalada, J. J. Roa, E. Jimenez-Pique, F. Soldera, S. P. Bruehl, S. Simison, L. Llanes, A. D. Sosa
Summary: Cycling contact fatigue indentation tests were conducted on cemented carbides coated with Ti(C,N)/alpha-Al2O3 and Zr(C,N)/alpha-Al2O3 systems under both dry and wet conditions. The results showed that under dry conditions, there was still coating deformation present in all imprints after the test, while under wet conditions, almost all imprints had the alpha-Al2O3 coating removed due to corrosion-fatigue. However, for Cr-containing cemented carbides combined with Zr(C,N)/alpha-Al2O3 coating, no delamination of alpha-Al2O3 was observed after the wet test, suggesting that this combination may have an advantage in resisting degradation by cyclic contact fatigue.
Article
Engineering, Biomedical
H. M. A. Kolken, A. Fontecha Garcia, A. Du Plessis, A. Meynen, C. Rans, L. Scheys, M. J. Mirzaali, A. A. Zadpoor
Summary: This study investigates the fatigue performance and crack formation mechanism of additively manufactured auxetic meta-biomaterials. Through full-field strain measurement and 3D imaging, the damage evolution during cyclic loading is revealed. Targeting the structural weak spots during the design and printing process is crucial for enhancing the performance of auxetic meta-biomaterials.
ACTA BIOMATERIALIA
(2022)
Article
Energy & Fuels
Pengyu Wang, Shuhong Wang, Alipujiang Jierula, Zihan Sun
Summary: This study investigates the connection and bifurcation problems of rock crack propagation by inserting cohesive elements, and finds the best method for insertion. Results show that using the maximum principal stress criterion and displacement law can achieve the best simulation outcomes.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Chemistry, Multidisciplinary
Feng Hu, Zhiqing Li, Yifan Tian, Ruilin Hu
Summary: This study investigated the failure patterns and interface crack evolution mechanisms of an artificial frozen soil-rock mixture under compression and tension loading. The main failure patterns observed were bulging deformations and short tension cracks under compression, and a tortuous tension crack in the center of the disk under tension. The meso-mechanical failure mechanisms were studied by using different rock block particles with varying surface roughness, showing that the soil-rock interface evolved into a soil-rock contact band with significantly higher strength. Multiple failure patterns of the soil-rock interface were observed, including cracks passing through the accurate interface, the envelope of rough rock blocks, and the rough rock blocks themselves. The results provide valuable insights for foundation engineering, particularly in pile foundation engineering in cold regions.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Borja Rodriguez-Arana, Albi San Emeterio, Unai Alvarado, Jose M. Martinez-Esnaola, Javier Nieto
Summary: A methodology based on physical models is proposed to predict the degradation of railway tracks due to Rolling Contact Fatigue (RCF), using multibody assessment and energy dissipation method to predict crack initiation points and crack propagation. Validation results show that this method can effectively predict the RCF behavior of track sections with different characteristics.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Guangliang Yan, Qibo Yang, Fengpeng Zhang, Qiqi Hao, Xiulong Wang, Haonan Wang
Summary: This study investigated the impact of static stress on the initiation and propagation of crack networks during hard rock blasting, showing that static stress can alter the morphology of the crack network and delay the formation of cracks. The findings suggest that the stress-strength ratio is a critical threshold affecting the crack network propagation.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Shuyu Wang, Linjuan Wang, Yunteng Wang
Summary: In this paper, a peridynamic model is proposed to investigate the influence of material heterogeneity on blast-induced crack initiation and propagation in brittle rock. The introduction of discretization in polar coordinates helps to avoid misleading directional guidance to crack initiation. The results demonstrate that the locations and sequence of crack initiation are determined by material heterogeneity, and cracks tend to propagate in rock with stronger heterogeneity.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Lizhou Wu, Jianting Zhou, Lin Luo, L. P. Yang
Summary: The relationship between velocity, acceleration, and dynamic fracture toughness during rapid crack propagation is investigated using a novel experiment setup. The dynamic stress intensity factor is studied using an experimental-numerical-analytical method, revealing its variation over time. Furthermore, acceleration is used to analyze the unsteady crack propagation process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Mechanical
Aljaz Ignatijev, Branko Necemer, Janez Kramberger, Srecko Glodez
Summary: A computational model is proposed to determine the fatigue life of sintered gears. The model utilizes the strain-life approach and the Paris law to calculate the number of cycles for crack initiation and propagation, respectively. The numerical results are compared with experimental data to validate the model.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Mechanics
Lanwen Wang, Xuanyu Sheng, Jianbin Luo
Summary: In this study, a peridynamic model is used to analyze the initiation and propagation of fatigue cracks in micro-contact areas. The results show that fatigue crack initiation is influenced by the maximum shear stress region, and the propagation path is affected by the contact pressure and coefficient of friction on the contact surface.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Jonas Rudshaug, Odd Sture Hopperstad, Tore Borvik
Summary: To develop accurate material models for glass, reliable experimental procedures are needed to capture the stochastic nature of the material. In this study, we conducted experiments on different windshields under quasi-static loading to reveal their stochastic behavior. We used 3D-Digital Image Correlation (3D-DIC) and high-speed cameras combined with pose estimation-based post-processing to monitor displacement field and capture fracture initiation and crack propagation data. Finite element simulations were also performed to estimate major principal stress values. The results from this study provided valuable data for the development of numerical models.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Luming Zhou, Shu Zhu, Zhende Zhu
Summary: This paper proposes an ordinary state-based peridynamic (OS-PD) model based on the Cosserat continuum to predict the propagation and coalescence of rock cracks. Compared with the classical OS-PD model, the pairwise moment between two material points is also considered in the proposed Cosserat ordinary state-based peridynamic (COS-PD) model. The rotational stiffness and rotation angle are introduced to characterize the microdeformation and microstructure of rock, and the expression of rotational stiffness coefficient is derived. Three numerical cases are presented to compare the performance of OS-PD model and COS-PD model, and the effect of rotational stiffness on crack growth is investigated. The results show that the introduction of pairwise moment accelerates the rock failure process, and the crack propagation type and coalescence mode are more inclined to shear failure with the increase of rotation stiffness coefficient. Compared with experimental results, it is found that the COS-PD model can extend the classical OS-PD model and better capture the evolution process of the rock crack.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Multidisciplinary Sciences
Hewan Li, Jian Liu, Laigui Wang, Tianjiao Ren
Summary: This paper proposes a method to analyze rock samples with different inclination angles from the standpoint of energy, using the bond-base peridynamic theory and the PMB model of brittle materials, combined with laboratory experiments. The whole process of shearing is analyzed, and the LAMMPS software is used to simulate the internal energy change of rock-like materials under shear conditions. The result shows that prefabricated cracks and the inclination of cracks are important factors for specimen damage, which has important theoretical value for rock mechanics research. The research results can reduce the occurrence of rock burst accidents, the difficulty of mine support, and the cost of mining engineering, as well as improve mine safety levels.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Wei Lu, Selda Oterkus, Erkan Oterkus, Dagang Zhang
Summary: A two-dimensional peridynamic contact model is proposed to simulate the propagation of frictional crack, contact constraint can be implemented without additional algorithm, and the geometry of the crack can be easily described. The contact force is only related to the stretch of the virtual bond between disconnected material points.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)