scholarly journals Instabilities encountered in the dynamic crack propagation process under impact loading as a natural consequence of the dynamic fracture discreetness

2020 ◽  
Vol 28 ◽  
pp. 1975-1980
Author(s):  
Yuri Petrov ◽  
Nikita Kazarinov
Keyword(s):  
Crack Propagation ◽  
Dynamic Fracture ◽  
Impact Loading ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Natural Consequence ◽  
Propagation Process ◽  
Crack Propagation Process

Instability effects of the dynamic crack propagation process

2021 ◽  
Vol 242 ◽  
pp. 107438
Author(s):  
N.A. Kazarinov ◽  
Y.V. Petrov ◽  
A.V. Cherkasov
Keyword(s):  
Crack Propagation ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Propagation Process ◽  
Crack Propagation Process

scholarly journals Dynamic crack propagation: quasistatic and impact loading

2016 ◽  
Vol 2 ◽  
pp. 389-394 ◽  
Author(s):  
Yuri Petrov ◽  
Nikita Kazarinov ◽  
Vladimir Bratov
Keyword(s):  
Crack Propagation ◽  
Impact Loading ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack

scholarly journals Dynamic Fracture Analysis of Functional Gradient Material Coating Based on the Peridynamic Method

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 62 ◽  
Author(s):  
Yu Zhang ◽  
Zhanqi Cheng ◽  
Hu Feng
Keyword(s):  
Elastic Modulus ◽  
Crack Propagation ◽  
Dynamic Fracture ◽  
Gradient Material ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Functional Gradient ◽  
Damage And Failure ◽  
Functional Gradient Material ◽  
Graded Material

Functional gradient materials (FGMs) have tremendous potential due to their characteristic advantage of asymptotic continuous variation of their properties. When an FGM is used as a coating material, damage and failure of the interface with the substrate component can be effectively inhibited. In order to study the dynamic crack propagation in FGM coatings, a new method, peridynamics (PD), was used in the present study to simulate dynamic fractures of FGM coatings bonded to a homogeneous substrate under dynamic loading. The bond-based PD theory was employed to study crack propagation and branching in the FGM coating. The influences of the coating gradient pattern, loading, and the geometry and size of the structure on crack curving and propagation under impact loading were investigated. The numerical results show that different forms of the elastic modulus of graded material, the geometry of the structure, and the loading conditions have considerate effects on crack propagation in FGM coatings, but a specific form of elastic modulus had a limited effect on the dynamic fracture of FGM coating.

scholarly journals Dynamic Crack Propagation and Fracture Behavior of Pre-cracked Specimens under Impact Loading by Split Hopkinson Pressure Bar

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Shijun Zhao ◽  
Qing Zhang
Keyword(s):  
Crack Propagation ◽  
Impact Loading ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Hopkinson Pressure Bar ◽  
Brazilian Disk ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Cracked Specimens

Deformation and fracture of brittle materials, especially crack propagation, have drawn wide attention in recent years. But dynamic crack propagation under impact loading was not well understood. In this paper, we experimentally tested Brazilian disk (BD) fine sandstone specimens containing pre-cracks under cyclic impact loading by the Φ 74 mm diameter split Hopkinson pressure bar (SHPB) test device. The pre-cracked specimens were named central straight through crack flattened Brazilian disk (CSCFBD). By using the low air-pressure loading conditions (0.1 MPa, equal to the impact velocity of 3.76 m/s), a series of dynamic impact tests were detected successfully, and the effects of pre-cracks on dynamic properties were analyzed. Experimental results show that the multiple cracks mostly initiate at/or near the pre-crack tips and then propagate in different paths and directions varying by inclination angles, leading to the ultimate failure. Compared to static or quasi-static loading, dynamic crack propagation and fracture behavior are obviously different. Furthermore, we characterized the crack propagation paths, directions, and fracture patterns and discussed the influences of the pre-cracks during the breakage process. We concluded that the results obtained are significant in investigating the failure mechanism and mechanical properties of brittle materials under impact loading.

scholarly journals Effect of Holes on Dynamic Crack Propagation under Impact Loading

2020 ◽  
Vol 10 (3) ◽  
pp. 1122
Author(s):  
Fei Wang ◽  
Meng Wang
Keyword(s):  
Crack Propagation ◽  
Impact Loading ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Models ◽  
Failure Criteria ◽  
Maximum Tensile Stress ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Hopkinson Pressure Bar ◽  
Cracked Structures

In civil, geotechnical, and mining engineering, the investigation of the holes’ effect on dynamic crack propagation is essential because it can be used to predict possible fracture and protect cracked structures being further damaged. In this paper, a specimen made from polymethyl methacrylate (PMMA) with a pre-crack and two holes was proposed, and the Split-Hopkinson pressure bar was employed to investigate the effect of holes on dynamic crack propagation under impact loading. Notably, the locations of the holes were well designed with different two-hole spacing (12 mm, 16 mm, and 20 mm) and crack-hole distance (15 mm, 30 mm, and 45 mm). Crack propagation gauges were applied to monitor the fracturing time and crack extending velocity. The interaction characteristic between the crack and two holes was studied numerically using the AUTODYN code. In the numerical models, the failure criteria of maximum tensile stress and softening damage were employed for brittle material. The crack path, the propagating velocity, the particle velocity vector, and the stress state between the holes were analyzed. The calculation results indicate that compressive stresses between the two holes induced by the deformation of the holes play a crucial role in confining the vertical crack propagation. Both experimental and numerical results demonstrate that the holes have a suppressing action on the moving crack; as the two-hole spacing decreases, the suppressing action intensifies.

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