scholarly journals Crack Propagation Characteristics of Coal Samples Utilizing High-Voltage Electrical Pulses

ACS Omega ◽  
2021 ◽  
Author(s):  
Hongqi Lu ◽  
Yanwei Liu ◽  
Baisheng Nie ◽  
Xiujuan Chen ◽  
Xiaokai Xu
Keyword(s):  
Crack Propagation ◽  
High Voltage ◽  
Propagation Characteristics ◽  
Electrical Pulses

Fast damaging processes in the TaN thin film absorbers under action of nanosecond electrical pulses

2016 ◽  
Vol 7 (5) ◽  
pp. 607-616 ◽  
Author(s):  
Linas Ardaravičius ◽  
Skirmantas Keršulis ◽  
Oleg Kiprijanovič ◽  
Česlovas Šimkevicius ◽  
Bonifacas Vengalis
Keyword(s):  
Thin Film ◽  
Crack Propagation ◽  
High Voltage ◽  
Crack Opening ◽  
High Voltage Pulse ◽  
High Energy ◽  
Physical Parameters ◽  
Nanosecond Duration ◽  
Content Type ◽  
Electrical Pulses

Purpose The purpose of this paper is to investigate damaging processes in TaN thin film absorbers under action of high-voltage electrical pulse of nanosecond duration. Despite having mechanical origin of crack opening, estimation based on the readings from oscillograms shows uncharacteristically high velocities of the crack propagation. Design/methodology/approach Microscopic images of damaged absorbers showing the final result of the damaging process provided initial information about its geometrical peculiarities. Then, to clarify the dynamics of the process, the authors create the model of the crack, having elements of self-similarities and multiple stage opening. The influence of heating induced by current concentration at crack tip and of magnetic stress of this concentrated current are both included in the model. Findings Using physical parameters of TaN layers with flowing current and performing calculations the authors define the conditions required to initiate the damaging process and to sustain it. Danger of such damage is relevant for high-Tc superconducting thin films after their switching to normal state which is induced by the high-voltage pulse. Practical implications There were made recommendations to manufactures aiming to improve electrical durability of the absorbers in an effort to prevent the damaging influence of power nanosecond electrical pulses. Originality/value Three stage opening model implies the appearance of zone of high-energy dissipation that can lead to detonation-like destruction of the film and, therefore, explain the high velocities of crack propagation.

scholarly journals Crack Propagation Characteristics and Fracture Surface Energy of Boride Cermets

2002 ◽  
Vol 66 (11) ◽  
pp. 1116-1121
Author(s):  
Hiromoto Kitahara ◽  
Yasuhiro Yoshikawa ◽  
Fuyuki Yoshida ◽  
Hideharu Nakashima ◽  
Kazuo Hamashima ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Surface Energy ◽  
Crack Propagation ◽  
Propagation Characteristics ◽  
Fracture Surface Energy

scholarly journals Investigation on Dynamic Propagation Characteristics of In-Plane Cracks in PVB Laminated Glass Plates

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaoqing Xu ◽  
Bohan Liu ◽  
Yibing Li
Keyword(s):  
Crack Propagation ◽  
Impact Loading ◽  
Crack Tip ◽  
Stress Waves ◽  
Critical Parameters ◽  
Propagation Mechanism ◽  
High Speed Photography ◽  
Laminated Glass ◽  
Propagation Characteristics ◽  
Crack Propagation Mechanism

Polyvinyl butyral (PVB) laminated glass has been widely used as an important component of mechanical and construction materials. Cracks on PVB laminated glass are rich in impact information, which contribute to its impact resistance design. In this paper, a three-dimensional (3D) numerical simulation model describing PVB laminated glass under impact loading is firstly established and validated qualitatively and quantitatively compared with the corresponding experimental results recorded by the high-speed photography system. In the meantime, the extended finite element method (XFEM) is introduced to analyze the crack propagation mechanism of laminated glass based on dynamic stress intensity factors (DSIFs) and propagations of stress waves. Parametric studies are then carried out to investigate the influence of five critical parameters, that is, plate dimension, crack length, impact energy, glass properties, and PVB properties, on crack propagation characteristics of laminated glass. Results show that the interaction between crack tip and stress waves as well as the propagations of stress waves corresponds to the fluctuations of DSIFs at crack tip. Both the structure and material variables are proven to play a very important role in glass cracking DSIFs and thus govern the crack propagation behavior. Results may provide fundamental explanation to the basic crack propagation mechanism on radial cracks in PVB laminated glass under impact loading conditions, thus to instruct its impact design improvement.

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