scholarly journals Dynamic aspects during full scale rotating bending axle tests using new generation of facilities with increased load frequency

2017 ◽  
Vol 4 ◽  
pp. 35-41
Author(s):  
Ivo Černý
Keyword(s):  
Full Scale ◽  
Load Frequency ◽  
Rotating Bending ◽  
New Generation

Mechanical and Metallurgical Aspects of the Resistance to Ductile Fracture Propagation in the New Generation of Gas Pipelines

2014 ◽  
Author(s):  
Igor Pyshmintsev ◽  
Alexey Gervasyev ◽  
Victor Carretero Olalla ◽  
Roumen Petrov ◽  
Andrey Arabey
Keyword(s):  
Ductile Fracture ◽  
Mechanical Test ◽  
Fracture Propagation ◽  
Rolling Plane ◽  
Full Scale ◽  
Charpy Test ◽  
Line Pipe ◽  
Surface Separation ◽  
Fracture Arrest ◽  
New Generation

The microstructure and fracture behavior of the base metal of different X80 steel line pipe lots from several pipeline projects were analyzed. The resistance of the pipes to ductile fracture propagation was determined by the full-scale burst tests. The high intensity of fracture surface separation (secondary brittle cracks parallel to the rolling plane of the plate) appeared to be the main factor reducing the specific fracture energy of ductile crack propagation. A method for quantitative analysis of microstructure allowing estimation of the steel’s tendency to form separations is proposed. The procedure is based on the EBSD data processing and results in Cleavage Morphology Clustering (CMC) parameter evaluation which correlates with full-scale and laboratory mechanical test results. Two special laboratory mechanical test types utilizing SENT and Charpy test concepts for prediction of ductile fracture arrest/propagation in a pipe were developed and included into Gazprom specifications.

scholarly journals Science Education in Egypt and Other Arab Countries in Africa and West Asia

1997 ◽  
Vol 3 (1) ◽  
pp. 91-103 ◽  
Author(s):  
Farkhonda Hassan
Keyword(s):  
Science Education ◽  
Education System ◽  
Teaching Methods ◽  
National Interest ◽  
Arab Countries ◽  
Full Scale ◽  
The Past ◽  
Practical Experiences ◽  
Traditional Patterns ◽  
New Generation

The Egyptian education system is large, and current practices are very rigid. It is accustomed to mass education as was developed in Europe over the past two hundred years, following closely the British tradition. Full-scale renovation of the existing system will take time; a ten-year period is estimated.  Significant changes are taking place in science programs offered to future citizens. Traditional patterns of science education, which build a strong theoretical tradition with less emphasis on laboratory and practical experiences, are changing rapidly. New programs and systems with more emphasis on research are being introduced. The content and teaching methods incorporated in these programs are based on the most up-to-date theories about what science is most worth knowing. The primary goal of the new generation science programs is to reflect the national interest of having a scientifically literate population. 

Ultra Heavy Wall Linepipe X65: Double Joint Girth Weld Performances for Severe Applications

2011 ◽  
Author(s):  
Luigi Di Vito ◽  
Gianluca Mannucci ◽  
Roberto Morana ◽  
Antonio Lucci ◽  
Federico Tintori ◽  
...  
Keyword(s):  
Large Strain ◽  
Full Scale ◽  
Corrosion Properties ◽  
Testing Program ◽  
Aggressive Environment ◽  
Girth Welds ◽  
High Level ◽  
New Generation ◽  
Cyclic Straining ◽  
Strain Cycling

Tenaris and Centro Sviluppo Materiali (CSM) launched a Joint Industrial Project aimed at developing heavy wall line pipes. The suitability for very severe applications, involving high service pressures and temperatures, the latter causing large strain fluctuations, in presence of an aggressive sour environment, is analyzed both theoretically and experimentally, including small and full scale pipe models. The full project program aims at developing a new generation heavy wall product, supported by: comprehensive laboratory analysis of the material response under severe mechanical loading in aggressive environment; and full scale testing program, including both pipe and girth weld. Both investigations are mainly addressed to the basic understanding of impact on design criteria from interaction between severe loading and aggressive environment. Three papers have been already presented, in previous OMAE conferences, on this project. In the present paper, main outcomes of laboratory testing activities of the above program on girth welds for double jointing (fill passes by Submerged Arc Welding) are reported. A fitted for purpose special testing program, including mechanical and SSC laboratory scale testing, has been executed. Full thickness longitudinal specimens were extracted crossing girth weld to apply severe strain cycling. The strain cycling has been defined as extreme in terms of resistance against ratcheting for the pressurized pipeline, as deduced in a work reported in one of the previously mentioned papers. The girth welds exhibited very satisfactory performance during severe cyclic straining. Furthermore, mechanical and stress-corrosion properties of the As-Weld girth joint have been compared with the corresponding properties after severe straining and ageing. This comparison highlighted high level of mechanical and SSC resistance, even after the application of severe straining and ageing.

Fatigue Testing and Analysis of Full Scale Girth Welded Tubulars

2007 ◽  
Author(s):  
Stig Wa¨stberg ◽  
Mamdouh M. Salama
Keyword(s):  
Fatigue Testing ◽  
Axial Loading ◽  
Full Scale ◽  
Fatigue Properties ◽  
Limiting Factor ◽  
Initiation Point ◽  
Fatigue Design ◽  
Axial Tension ◽  
Rotating Bending ◽  
Girth Welds

Heavy duty girth welded tubulars are used for many critical structural members offshore, e.g. free spanning pipelines, risers and tethers. The fatigue properties of those girth welds are often the design limiting factor. Today’s fatigue design rules for girth welded tubulars are mainly based on testing of segment specimens machined from a girth weld. Such specimens do strictly speaking not simulate all the features of a complete girth weld in a tubular. Lately some data have become available from rotating bending of full scale tubulars. However data from axial loading of full scale tubulars are rare. In this study full scale (OD 24”, 609.6 mm, thickness 0.812”, 20.6 mm) girth welded tubulars were fatigue tested in axial tension. Each tubular specimen contained three girth welds, equalling almost 6 m of weldment for each test. Both as-welded, TIG-dressed and ground weldments were included in the test program. The fracture surfaces were inspected for determination of the initiation point and its relation to welding flaws. The test results are compared to common fatigue design curves. The significance of embedded weld flaws in ground welds and the relationship to S-N curves for ground welds is discussed.

scholarly journals Problems of evaluating development testing quality of missile prototypes in full-scale experiments at the development testing stage and ways of solving these problems

2018 ◽  
pp. 35-52
Author(s):  
V. V. Doronin
Keyword(s):  
Development Process ◽  
Process Quality ◽  
Full Scale ◽  
Design And Development ◽  
Testing Stage ◽  
Labour Input ◽  
New Generation

The paper analyses whether the volume of new generation missile testing is sufficient for a given development timescale. We consider development testing specifics for the new generation of missiles. The paper cites labour input estimates for debugging the software used in contemporary surface-to-air missiles. We present an approach to estimating missile design and development process quality according to a combination of indices, taking into account how urgent the problem under consideration is for a range of leading developers, as well as for the benefit of the customer.

Estimation of Crack Depth and Profile Using DCPD Method in Full Scale Railway Axle Loaded by Rotating Bending

2015 ◽  
Vol 732 ◽  
pp. 171-174 ◽  
Author(s):  
Ivo Černý
Keyword(s):  
Direct Current ◽  
Crack Depth ◽  
Potential Drop ◽  
Full Scale ◽  
Circumferential Crack ◽  
Railway Axle ◽  
Relevant Point ◽  
Rotating Bending ◽  
Bending Loading ◽  
Current Potential

The paper contains results of a study aimed at exploring possibilities of use of direct current potential drop (DCPD) method for evaluation of depth and profile of cracks occurred under or near press fitted hubs in a full-scale axle during severe rotating bending loading. DCPD method was applied on section of an axle after fatigue by a specific way and potentials were measured in several circumferential areas of the axle section, when direct current passed longitudinally. Results are analysed and discussed. It was indicated that unlike previous use of the method for crack measurement of different components, even large and complicated, described in the literature, when potentials corresponded to ratio of cracked and uncracked area, in this case of approximately circumferential crack, measured potentials correspond better to relative crack depth in the relevant point of the circumference.

Experimental Verifications of a Theoretical Procedure for Propeller-Induced Hull Pressure Calculations

1984 ◽  
Vol 21 (02) ◽  
pp. 119-133
Author(s):  
A. Colombo ◽  
B. Chilo'
Keyword(s):  
Computer Program ◽  
Full Scale ◽  
Pressure Amplitude ◽  
Towing Tank ◽  
Ship Model ◽  
Single Screw ◽  
Propeller Design ◽  
Experimental Values ◽  
New Generation ◽  
Theoretical Procedure

This paper describes the methodologies adopted by the Italian Ship Research Center to predict propeller-induced pressures. An outline of the developed computer program is given, and calculated pressure amplitude results for two ships are compared with the experimental values obtained from full-scale measurements. In particular, calculated pressure results, produced by three different propeller design solutions at several points on the stern of a new-generation single-screw roll-on/roll-off containership, are discussed and compared with the same quantities measured both on a ship model in the Depressurized Towing Tank of the Netherlands Ship Model Basin and on the full-scale ship fitted with the selected propeller.

Anaerobic Treatment of Low, Medium and High Strength Effluent in the Agro-industry

1999 ◽  
Vol 40 (8) ◽  
pp. 221-228 ◽  
Author(s):  
W. Driessen ◽  
P. Yspeert
Keyword(s):  
High Strength ◽  
Anaerobic Treatment ◽  
Full Scale ◽  
Processing Plant ◽  
Internal Circulation ◽  
Volumetric Loading ◽  
Two Stages ◽  
New Generation ◽  
Very High ◽  
Ic Technology

Based on the widely applied UASB system for anaerobic wastewater treatment a new generation of more advanced anaerobic reactor systems have recently been developed, according to the so-called expanded sludge bed concept. A successful version of this concept is the Internal Circulation (IC) reactor, characterized by the biogas separation in two stages within a reactor with a high height/diameter ratio and the gas-driven internal effluent circulation. The IC system can handle high upflow liquid and gas velocities, which makes treatment of low strength effluents at short hydraulic retention times, as well as treatment of high strength effluents at very high volumetric loading rates feasible. During the past years the IC technology has been successfully applied at full scale on a variety of industrial wastewaters. This article describes the design and operational results of three full scale anaerobic treatment plants with Internal Circulation reactors treating low, medium and high strength effluents from a dairy industry, food processing plant and brewery respectively.

Sign in / Sign up

Export Citation Format

Share Document