scholarly journals The Possibility of Extending the Life of Cast Steel Hulls of the Steam Turbine

2019 ◽  
Vol 49 (3) ◽  
pp. 17-32
Author(s):  
Adam Charchalis ◽  
Tomasz Dyl ◽  
Agata Wieczorska
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Cast Steel ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Cold Zone ◽  
Last Stage ◽  
The Impact ◽  
Non Destructive ◽  
Material Tests

Abstract The paper presents the analyze the lifetime of the HP steam turbine hull for the EC Gdynia TG1 combined heat and power plant as part of the renovation. The impact of exploitation on changes in mechanical properties of the steam turbine hulls was determined. At the preliminary material tests were carried out, qualifying the hull of the steam turbine to undertake the revitalization process. Then, after non-destructive testing, trepanation samples were taken from the cold zone and the hot hull, which were subjected to mechanical properties tests. The next stage of work was the revitalization process including hardening and tempering. The mechanical properties and metallographic were carried out testing. In the next stage of work, non-destructive testing was performed to detect cracks and a decision was made to repair these areas by welding. The last stage of the work includes an analysis of the vitality of the steam turbine hull after revitalization.

scholarly journals Study on joint detection of fabricated concrete shear wall based on percussion method

2019 ◽  
Vol 277 ◽  
pp. 03019
Author(s):  
Bo Song ◽  
Jian Li ◽  
Man sheng Wang
Keyword(s):  
Great Influence ◽  
Peak Frequency ◽  
Joint Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Knock Detection ◽  
The Time Domain ◽  
The Impact ◽  
Non Destructive ◽  
Peak Value

The knock detection method is one of the non-destructive testing methods for assembly prefabricated components. The knocker is used to knock on the concrete prefabricated components to be tested. The internal conditions of the tested components can be judged by analyzing the time-domain and frequency-domain diagrams of the knocker. In this paper, the impact of the change of the knock point on the detection is studied by using the knock detection experiment. It is found that the location of the knock point has a great influence on the detection. With the change of the position of the knock point, the peak frequency in the spectrum obtained by the detection changes correspondingly. According to the frequency information corresponding to the peak value in the spectrum, the depth of the void to the knock surface can be calculated.

Study of Nanostructured Composites Using the Sclerometry Method

2014 ◽  
Vol 627 ◽  
pp. 233-236 ◽  
Author(s):  
Natalia Lvova ◽  
Sergey Perfilov ◽  
A. Useinov
Keyword(s):  
Mechanical Properties ◽  
Quality Control ◽  
Comparative Study ◽  
Scratch Test ◽  
Extrusion Process ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Stress Strain ◽  
Nanostructured Composites ◽  
Non Destructive

A comparative study of the mechanical properties of the extruded and flattened nanostructured composites Al-C60 has been made using two different methods of destructive and non-destructive testing: tensile and compression macro-tests and sub-micron range sclerometry (scratch test). Direct correlation was found between the dominant types of deformation during scratching and the type of “stress-strain” dependencies. The results are useful for understanding the extrusion process and quality control at different load scale.

scholarly journals Risk Based Inspection of Jackets Submitted to Through-Wall Cracks

2003 ◽  
Author(s):  
Franck Schoefs ◽  
Mustapha Rguig
Keyword(s):  
Decision Aid ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Probability Of False Alarm ◽  
The Impact ◽  
Non Destructive ◽  
Rational Process

The actual challenge for the requalification of existing offshore structures through a rational process of reassessment leads to state the importance of Risk Based Inspection methodology. This paper points out the inspection results modelling and their contribution to decision aid tools. The study of the impact of through cracks on structural integrity of jacket platforms is still a challenge. The detection of large cracks is first addressed. In order to minimize inspections and maintenance costs, all the available data from inspection results, such as probability of detection and probability of false alarm, must be addressed, as well as the probability of crack presence. This can be achieved by the use of the decision theory. These capabilities of Non Destructive Testing give a first input for the risk study. A cost function is suggested to introduce this modelling into a risk analysis and is devoted to help rank the NDT tools. The case of large through-wall cracks is specifically addressed.

scholarly journals Reinforcing the mechanical properties of poplar LVL with hardwood veneer layers, Part I.: Non-destructive testing and modelling the elastic properties

2014 ◽  
Vol 62 (1) ◽  
pp. 24-30
Author(s):  
Edit Beáta VILPPONEN ◽  
Szabolcs KOMÁN ◽  
László BEJÓ
Keyword(s):  
Mechanical Properties ◽  
Elastic Properties ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

<p class="p1"><span class="s1">A hazai nemesnyár anyagok értéknövelt hasznosításának a</span>z egyik lehetősége az LVL termék<span class="s1"> készítése. A nyár LVL mechanikai tulajdonságai </span>némileg elmaradnak a jelenleg kapható fenyő LVL paramétereitől. A tulajdonságok javíthatók keménylombos erősítő rétegek alkalmazásával.</p><p class="p2">Az ismertetett kutatás során óriás- és olasznyár fafajtákból készült LVL mechanikai tulajdonságait módosítottuk bükk, csertölgy, illetve bálványf<span class="s2">a erősítő furnérrétegekke</span>l. Az elkészült LVL termékek mechanikai tulajdonságait roncsolásmentes módszerekkel és statikus vizsgálatokkal határoztuk meg. A lemezek rugalmassági modulusát modellezéssel is becsültük, a furnérrétegek elasztikus tulajdonságai és feltételezett tömörödése alapján.<span class="s2"> A cikksorozat első részében a roncsolásmentesen mért és modellezett elasztikus tulajdonságokat mutatjuk be.</span></p><p class="p3">Az erősítő rétegek használatával a rugalmassági modulus értékek szignifikánsan növekedtek. Bükk esetében a javulás a várakozásnak megfelelő volt, míg csertölgy, és különösen bálványfa esetén jóval meghaladták azt, ami mutatja, hogy e furnérok erősítő rétegként történő alkalmazásában jelentős lehetőségek rejlenek. Az alkalmazott modell jól becsülte a nyár kontroll lemezek és a bükk furnérral erősített lemezek rugalmassági modulusát, azonban konzervatív becslést adott a csertölgy és bálványfa rétegek hatása tekintetében.</p>

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