Crack Propagation in MG-PSZ

1986 ◽  
Vol 78 ◽  
Author(s):  
M. J. Readey ◽  
A. H. Heuer ◽  
R. W. Steinbrech
Keyword(s):  
Crack Propagation ◽  
Crack Extension ◽  
Crack Path ◽  
Video Recording ◽  
Stable Crack Growth ◽  
Recording System ◽  
Coarse Grained ◽  
High Toughness ◽  
Flaw Tolerance ◽  
Dcb Specimen

ABSTRACTCertain coarse-grained Mg-PSZ's exhibit marked R-curve behavior, e.g., the crack resistance increases from ∼5 to ∼15 MPam1/2 with the first 500 microns of crack extension. These high toughness materials also show unusually-good flaw tolerance.Crack propagation and crack path development in Mg-PSZ were investigated during stable crack growth using a modified DCB specimen geometry. Crack extension was monitored with a traveling microscope equipped with a video recording system. PSZ's with various heat-treatments were tested to determine the effect of microstructure on R-curve behavior.Cracks were found to propagate discontinuously and to arrest. Smaller microcracks would develop around the arrested crack, and link together to form the macrocrack which led to eventual failure.

Neuroendovascular training using multisource video-recording system in a hybrid operating room

2021 ◽  
Author(s):  
Satoshi Koizumi ◽  
Masaaki Shojima ◽  
Shogo Dofuku ◽  
Akira Saito ◽  
Seiji Nomura ◽  
...  
Keyword(s):  
Operating Room ◽  
Video Recording ◽  
Recording System ◽  
Hybrid Operating Room

Digital video recording system using multibeam magneto-optical disk drive

1990 ◽  
Author(s):  
Kazuhiro Yoshihara ◽  
Ryuichi Katayama ◽  
Yutaka Yamanaka ◽  
Masaki Tsunekane ◽  
Yuzo Ono ◽  
...  
Keyword(s):  
Digital Video ◽  
Video Recording ◽  
Disk Drive ◽  
Optical Disk ◽  
Recording System ◽  
Optical Disk Drive

scholarly journals Technological video survaillance as protective tool of smart electricity meters from unauthorized access

2020 ◽  
Vol 2020 (2) ◽  
pp. 7-13
Author(s):  
Oxana Garifullaevna Koispaeva ◽  
Sergey Vladimirovich Golovko ◽  
Maksim Almansurovich Nadeev
Keyword(s):  
Video Surveillance ◽  
Surveillance System ◽  
Information Technologies ◽  
Video Recording ◽  
Video Stream ◽  
Recording System ◽  
Economic Feasibility ◽  
Electrical Networks ◽  
New Information ◽  
Different Types

The article touches upon the problems of interference in the electricity metering system and different types of electricity loss underestimation. It has been stated that in modern conditions the only effective way to identify and prevent violations is to install a remote electricity meter at the borderline of balance and operational responsibilities. РиМ 384.02 smart electricity meter is considered as an example. A picture of the device is presented and its main positive characteristics are listed. It has been proposed to introduce the twenty-four-hour video surveillance and video recording system into an expensive smart electricity meter in order to maintain the integrity and operability of the device. Video stream processing by means of machine vision and machine learning has been proposed. The economic feasibility of digitalization of the technological video surveillance system is being substantiated. The need of optimization of the electrical networks, the improvement of electricity metering system and of introducing the new information technologies in energy sales has been substantiated

Role of Spectacle Mounted Video Recording System in Residency Training Programme

2016 ◽  
Vol 2 (1) ◽  
pp. 5-8
Author(s):  
Pandey S. ◽  
◽  
Chittoria R.K. ◽  
Mohapatra D.P. ◽  
Friji M.T. ◽  
...  
Keyword(s):  
Residency Training ◽  
Video Recording ◽  
Training Programme ◽  
Recording System

Slow Crack Growth in Dental Composites

1985 ◽  
Vol 55 ◽  
Author(s):  
G. M. Montes-G. ◽  
R. A. Draughn ◽  
T. H. Simpson
Keyword(s):  
Crack Propagation ◽  
Crack Growth ◽  
Slow Crack Growth ◽  
High Stress ◽  
Torsion Test ◽  
Stable Crack Growth ◽  
Test Method ◽  
Volume Percent ◽  
Stick Slip ◽  
Model Composite

ABSTRACTThe fracture properties of selected commercial composite dental restorative materials and a model composite system were studied to determine the influences of the reinforcing phase, exposure to water, and particle/polymer adhesion on crack propagation. The content of inorganic fillers ranged from 36 to 62 volume percent. In the model system the polymer phase approximated that of the commercial products, a constant size distribution of quartz fillers was used, and polymer/particle adhesion was varied. The double torsion test method was employed to measure relationships between applied stress intensity factor and velocity of crack propagation during stable crack growth. In all systems, cracks propagated through regions of high stress concentration at the low end of the velocity range studied (10−7 m/sec to 10−3 m/sec). Wet materials fractured at lower stress intensities than dry materials at all velocities. At high velocities unstable (stick-slip) growth occurred in dry materials with strong filler/matrix interfaces and in wet specimens with initially strong interfaces and less than 41 volume percent filler. In wet conditions, materials with poorly bonded fillers fractured by slow crack growth at stress intensities 10% to 30% below the levels of composites with strong interfaces.

scholarly journals Microstructure and Mechanical Properties Affecting Crack Growth Behaviour in AA6060 Produced by Equal-Channel Angular Extrusion

2008 ◽  
Vol 584-586 ◽  
pp. 815-820 ◽  
Author(s):  
Lothar W. Meyer ◽  
Kristin Sommer ◽  
T. Halle ◽  
Matthias Hockauf
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Growth ◽  
Charpy Impact ◽  
Coarse Grained ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Impact Tests

Crack growth in AA6060 after two and eight equal-channel angular extrusions (ECAE), showing a bimodal microstructure and a homogenous ultrafine-grained microstructure, respectively, are compared to the coarse grained counterpart. Furthermore, an optimized condition, obtained by combining one ECA-extrusion and a subsequent short aging treatment is included. Fatigue crack growth behaviour in the near-threshold regime and the region of stable crack growth is investigated and related to microstructural features such as grain size, grain size distribution, grain boundary characteristics and ductility. Micrographs of crack propagation surfaces reveal information on crack propagation features such as crack path deflection and give an insight to the underlying microstructure. Instrumented Charpy impact tests are performed to investigate crack initiation and propagation under impact conditions. Due to the recovery of ductility during the post-ECAE heat treatment, the optimized condition shows improved fatigue crack properties and higher energy consumption in Charpy impact tests, when compared to the as-processed conditions without heat treatment.

High Data-Rate Phase-Change Media for the Digital Video Recording System

2000 ◽  
Vol 39 (Part 1, No. 2B) ◽  
pp. 762-765 ◽  
Author(s):  
Benno Tieke ◽  
Martijn Dekker ◽  
Nicola Pfeffer ◽  
Roel van Woudenberg ◽  
Guo-Fu Zhou ◽  
...  
Keyword(s):  
Phase Change ◽  
Digital Video ◽  
Video Recording ◽  
Data Rate ◽  
Recording System ◽  
High Data Rate ◽  
High Data
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