Research on the Propagation of the Crack Inclined across the Interface in the Cermet Cladding Part

2011 ◽  
Vol 697-698 ◽  
pp. 430-435
Author(s):  
Jun Ru Yang ◽  
Z.Q. Li ◽  
C.Z. Huang ◽  
X.F. Wang ◽  
G.C. Wang
Keyword(s):  
Interface Crack ◽  
Theoretical Research ◽  
Propagation Property ◽  
Research Results ◽  
Propagation Criterion ◽  
Propagation Law

A new comparative propagation property parameter CP suitable to judge the propagation of the interface crack in the cladding part is proposed. The propagation criterion for the crack inclined across the interface is established. The theoretical research on the CPxA and CPxB of this interface crack propagating in the clad and substrate separately is carried out. The propagation law of the interface crack in the cermet cladding part is investigated with an example. The research results show that, within the ranges of the studied parameters, CPxA is bigger than CPxB, and that the crack initially propagates in the clad.

Research on the Propagation of the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part

2012 ◽  
Vol 426 ◽  
pp. 287-292
Author(s):  
J.R. Yang ◽  
X.F. Wang ◽  
Y.K. Zhang ◽  
Z.Q. Li ◽  
C.Z. Huang
Keyword(s):  
Crack Propagation ◽  
Interface Crack ◽  
Propagation Direction ◽  
Theoretical Research ◽  
Propagation Property ◽  
Research Results ◽  
Object A ◽  
Crack Propagation Direction ◽  
Propagation Law ◽  
Crack Propagation Criterion

Taking the interface crack in the cermet cladding part as the study object, a new comparative propagation property parameter (CPPP) CP suitable to judge the interface crack propagation direction in the cladding part is proposed. The interface crack propagation criterion is established. Based on it, the theoretical research on the parameters (CP1, CP2 and CPi) for the crack parallel to and lying on the interface propagating to the clad, to the substrate, and along the interface is carried out. The interface crack propagation law is investigated with an example. The research results show that the crack will more easily deflect to the clad.

scholarly journals Autodyne signal features of frequency-locked microwave oscillators

2019 ◽  
Vol 30 ◽  
pp. 12012 ◽  
Author(s):  
Vladyslav Ya. Noskov ◽  
Kirill A. Ignatkov ◽  
Kirill D. Shaidurov
Keyword(s):  
Experimental Data ◽  
Signal Analysis ◽  
Gunn Diode ◽  
Theoretical Research ◽  
Research Results ◽  
Microwave Oscillators ◽  
Signal Features ◽  
External Frequency ◽  
Autodyne Signal ◽  
The Impact

The research results on the autodyne signal formation in microwave oscillators, which are exposed under the impact of the proper reflected emission and, at the same time, of the external frequency-locked signal are presented. The basic relations are obtained for signal analysis under the condition of the quasistatic target movements. The theoretical research results are confirmed by experimental data obtained on the example of an oscillator made on the basis of the 8mm-range Gunn diode.

scholarly journals MODEL OF ACOUSTIC EMISSION SIGNAL AT THE PREVAILING MECHANISM OF COMPOSITE MATERIAL MECHANICAL DESTRUCTION

Aviation ◽  
2010 ◽  
Vol 14 (4) ◽  
pp. 95-103 ◽  
Author(s):  
Sergey Filonenko ◽  
Tatiana Nimchenko ◽  
Alexandr Kosmach
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Acoustic Emission Signal ◽  
Theoretical Research ◽  
Variable Velocity ◽  
Destruction Process ◽  
Mechanical Destruction ◽  
Research Results ◽  
Emission Signal ◽  
Signal Modelling

A model of acoustic emission signal formation at the prevailing mechanism of the destruction of composite materials is considered. The results of acoustic emission signal modelling are presented, taking into account the variable velocity of loading change. Acoustic emission signal experimental research results corresponding to theoretical research results are considered in this paper. It is shown that irregularity of the trailing edge of the acoustic emission signal is influenced by the change in the rate of the destruction process in composites. Santrauka Išnagrinetas akustines emisijos signalo modelis su vyraujančiu kompozitiniu medžiagu irimo mechanizmu. Pateikti akustines emisijos signalu modeliavimo rezultatai, ivertinant skirtinga apkrovos pasikeitimo greiti. Taip pat pateikti eksperimentinio akustines emisijos signalu tyrimo rezultatai, kurie sutampa su teoriniais tyrimais. Parodyta, kad akustines emisijos signalo galinio fronto netolygumas atsiranda tuomet, kai kinta kompozitines medžiagos irimo greitis.

Influence of Top Slag on the Plasticity of CaO-SiO2-Al2O3 Inclusions in 42CrMoA Crankshaft Steel

2014 ◽  
Vol 804 ◽  
pp. 285-288
Author(s):  
Jian Tao Ju ◽  
Sen Yang ◽  
Yan Ping Guo ◽  
Yuan She ◽  
Zhao Hui Zhang
Keyword(s):  
Molten Steel ◽  
Good Choice ◽  
Oxygen Activity ◽  
Theoretical Research ◽  
Calcium Activity ◽  
Research Results ◽  
Mass Percent ◽  
Top Slag

In order to control the plasticity of CaO-SiO2-Al2O3system inclusions so as to reduce the harm to the quality of 42CrMoA crankshaft steel, the target controlling ranges of CaO-SiO2-Al2O3inclusions is put forward. On the basis, influence of CaO-SiO2-Al2O3and CaO-SiO2-Al2O3-MgO system top slag on the content of calcium and aluminum in molten steel is contrasted. Theoretical research results show that, calcium activity should be controlled in the range of (90~3300)×10-10, oxygen activity should be below 7×10-6, the mass percent of calcium should be controlled more than 75ppm. And CaO-SiO2-Al2O3-MgO should be a good choice to obtain the plastic inclusions of CaO-SiO2-Al2O3.

scholarly journals Digital Radio Networks Centralized Elements Synchronization Model with Random Multiple Access to the CSMA/CA Type Medium

2020 ◽  
pp. 128-154
Author(s):  
Maksim Peregudov ◽  
Anatoliy Steshkovoy
Keyword(s):  
Communication Networks ◽  
Analytical Model ◽  
Multiple Access ◽  
Radio Networks ◽  
Packet Transmission ◽  
Theoretical Research ◽  
Radio Network ◽  
Radio Communication ◽  
Digital Radio ◽  
Research Results

Currently, there is a great interest in digital radio network centralized elements synchronization with random multiple access to the CSMA/CA type , the effectiveness of which determines the process of establishing a communication session. At the same time, there was no assessment effectiveness digital radio communication network centralized elements synchronization with random multiple access to the CSMA/CA type. Also, there was no assessment made the contribution of potential destructive actions by the attacker to the reduction in the effectiveness of such synchronization. This paper presents digital radio networks centralized elements synchronization analytical model with random multiple access to the CSMA/CA type medium. In this model the theoretical resulting indicator is the probability of successful delivery of a synchronization package, and a package frequency of successful delivery is used in experimental indicator evaluation . The model takes into account the potential destructive effects of the attacker in analytical expressions for known probabilistic indicators. An digital radio network  centralized elements synchronization with random multiple access to a CSMA/CA type experimental study an environment is also presented. The most common network of digital radio standard IEEE 802.11 (Wi-Fi) is considered as such network. The experimental research results differ from the theoretical research results slightly, which indicates the adequacy of the developed analytical model. It was established, firstly, that the successful delivery probability of a synchronization packet does not depend on number of subscriber terminals in digital radio communication networks, secondly, with an average duration of a data packet transmission by such terminal less than 0.85 ms, it is advisable to use non-random, and the reserved multiple access to the environment, and, thirdly, centralized synchronization is resistant to destructive influences. The model is applicable in the design of digital radio networks with random multiple access to the medium such as CSMA/CA, as well as in optimizing the operation of such networks.

scholarly journals Digital Radio Networks Centralized Elements Synchronization Model with Random Multiple Access to the CSMA/CA Type Medium

2020 ◽  
Vol 19 (1) ◽  
pp. 128-154 ◽  
Author(s):  
Maksim Peregudov ◽  
Anatoliy Steshkovoy
Keyword(s):  
Communication Networks ◽  
Analytical Model ◽  
Multiple Access ◽  
Radio Networks ◽  
Packet Transmission ◽  
Theoretical Research ◽  
Radio Network ◽  
Radio Communication ◽  
Digital Radio ◽  
Research Results

Currently, there is a great interest in digital radio network centralized elements synchronization with random multiple access to the CSMA/CA type , the effectiveness of which determines the process of establishing a communication session. At the same time, there was no assessment effectiveness digital radio communication network centralized elements synchronization with random multiple access to the CSMA/CA type. Also, there was no assessment made the contribution of potential destructive actions by the attacker to the reduction in the effectiveness of such synchronization. This paper presents digital radio networks centralized elements synchronization analytical model with random multiple access to the CSMA/CA type medium. In this model the theoretical resulting indicator is the probability of successful delivery of a synchronization package, and a package frequency of successful delivery is used in experimental indicator evaluation . The model takes into account the potential destructive effects of the attacker in analytical expressions for known probabilistic indicators. An digital radio network  centralized elements synchronization with random multiple access to a CSMA/CA type experimental study an environment is also presented. The most common network of digital radio standard IEEE 802.11 (Wi-Fi) is considered as such network. The experimental research results differ from the theoretical research results slightly, which indicates the adequacy of the developed analytical model. It was established, firstly, that the successful delivery probability of a synchronization packet does not depend on number of subscriber terminals in digital radio communication networks, secondly, with an average duration of a data packet transmission by such terminal less than 0.85 ms, it is advisable to use non-random, and the reserved multiple access to the environment, and, thirdly, centralized synchronization is resistant to destructive influences. The model is applicable in the design of digital radio networks with random multiple access to the medium such as CSMA/CA, as well as in optimizing the operation of such networks.

scholarly journals Scientifically substantiated technology for reverse extrusion of products made of anisotropic tubular billets

2019 ◽  
Vol 2019 (10) ◽  
pp. 12-18
Author(s):  
Сергей Ларин ◽  
Sergey Larin ◽  
В. Булычев ◽  
V. Bulychyov
Keyword(s):  
Orthotropic Material ◽  
Theoretical Research ◽  
Stress Strain ◽  
Cylindrical Anisotropy ◽  
Research Results ◽  
Tubular Billet

The theoretical research results of the reverse extrusion of a heavy-walled tubular billet made of orthotropic material having a cylindrical anisotropy of stress-strain properties are presented. The assessment of force modes and limiting potentialities of the reverse extrusion of anisotropic tubular billets is carried out.

scholarly journals A Brief Analysis of Subtitle Translation of Documentary Wild China from the Perspective of Eco-translatology

2019 ◽  
Vol 9 (10) ◽  
pp. 1301
Author(s):  
Yang Zhou ◽  
Rouqi Zhang
Keyword(s):  
Case Analysis ◽  
Theoretical Research ◽  
Theoretical Discussion ◽  
Research Results ◽  
Research Perspective ◽  
National Geographic ◽  
The Past ◽  
Theoretical Support

Based on the principle of truth, the documentary exchanges knowledge and conveys emotions. The documentary Wild China has received strong attention from domestic and foreign audiences since its launch on National Geographic. However, due to the differences between Chinese and Western cultures, most Chinese viewers need subtitle translation to have a better understanding of this documentary. Unlike the subtitle translation of films and TV plays, the content of the documentary has strong professionalism and knowledge. Thus, documentary subtitle translation requirements are also higher than those of films and TV plays. Meanwhile, it is necessary to discuss the subtitle translation of documentaries. Ecological translation was first proposed by Professor Hu Gengshen. In the past ten years, many remarkable research results have been achieved. Taking ecological translation as the theoretical support, this paper chooses the subtitle translation of the documentary Wild China (CCTV) as the research object, and combines the theoretical discussion and the case analysis to focus on the translator’s “adaptation” and “selection” in the linguistic, cultural and communicative dimensions, thus verifying the guiding significance of eco-translatology to the subtitle translation of the documentary and supplementing the theoretical research perspective of subtitle translation of the documentary.

Research of Coalbed Methane Fracturing Crack Initiation and Propagation Law

2014 ◽  
Vol 670-671 ◽  
pp. 295-299
Author(s):  
Ying Song Lin ◽  
Xiao Fei Wei ◽  
Xue Zhou ◽  
Shuai Han
Keyword(s):  
Crack Initiation ◽  
Coalbed Methane ◽  
Fracture Propagation ◽  
Theoretical Research ◽  
Research Progress ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation ◽  
Propagation Law ◽  
Development Direction ◽  
Main Factors

Coalbed methane resource is rich in China, however the original fracture system is complex and the fracturing effect, the fracturing crack initiation and propagation law are different from conventional formations, so the conventional hydraulic fracturing experience is not applicable. This paper summarized previous experience, systematically discussed the main factors and influences of coalbed methane fracturing, analyzed the research progress of CBM for fracture propagation law and the main problems and put forward some recommendations on the development direction of theoretical research on coalbed methane fracturing, which are necessary for depth research of coalbed methane fracturing crack propagation law.

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