Determination of Current Mechanical Properties of Components in Service Using Sub-Sized Specimens

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F16%3AN0000022" target="_blank" >RIV/26316919:_____/16:N0000022 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/26316919:_____/16:N0000021

Výsledek na webu

<a href="http://www.vttresearch.com/impact/publications" target="_blank" >http://www.vttresearch.com/impact/publications</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Determination of Current Mechanical Properties of Components in Service Using Sub-Sized Specimens

Popis výsledku v původním jazyce

Degradation of the properties of metal materials can lead to loss of reliability and safety of machines and metal structures in power plants during their operation. However, a number of these machines or metal structures (e.g. turbines, boilers and steam lines) could be used for longer time than has been predicted by their designed lifetime. A component’s residual life can be evaluated with standard me-chanical test techniques, such as the tensile test, the fatigue test, the Charpy or the fracture toughness test. However, for these tests there is usually insufficient material to sample non-invasively from the component. Therefore, non-destructive techniques are being developed as well as testing methods using mini-samples. One of the widely used methods of mini-samples testing is the Small Punch Test (SPT). The SPT is usually based on conversion of the obtained results into conventional mechanical characteristics. How-ever, it requires known correlation parameters determined for the specific material and must be verified for each new material. On the other hand, there exist small specimen testing techniques (e.g. the micro-tensile test, the miniature fatigue test and the mini-Charpy test) respecting the same loading mode as in the case of standard samples and maintaining minimal material requirements without requiring previ-ously established correlations. This paper focuses on the applicability and reliability of these testing techniques for determining cur-rent mechanical properties of components in service. Therefore, material degradation can be correctly and non-destructively determined.

Název v anglickém jazyce

Determination of Current Mechanical Properties of Components in Service Using Sub-Sized Specimens

Popis výsledku anglicky

Degradation of the properties of metal materials can lead to loss of reliability and safety of machines and metal structures in power plants during their operation. However, a number of these machines or metal structures (e.g. turbines, boilers and steam lines) could be used for longer time than has been predicted by their designed lifetime. A component’s residual life can be evaluated with standard me-chanical test techniques, such as the tensile test, the fatigue test, the Charpy or the fracture toughness test. However, for these tests there is usually insufficient material to sample non-invasively from the component. Therefore, non-destructive techniques are being developed as well as testing methods using mini-samples. One of the widely used methods of mini-samples testing is the Small Punch Test (SPT). The SPT is usually based on conversion of the obtained results into conventional mechanical characteristics. How-ever, it requires known correlation parameters determined for the specific material and must be verified for each new material. On the other hand, there exist small specimen testing techniques (e.g. the micro-tensile test, the miniature fatigue test and the mini-Charpy test) respecting the same loading mode as in the case of standard samples and maintaining minimal material requirements without requiring previ-ously established correlations. This paper focuses on the applicability and reliability of these testing techniques for determining cur-rent mechanical properties of components in service. Therefore, material degradation can be correctly and non-destructively determined.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/LO1412" target="_blank" >LO1412: Rozvoj Západočeského materiálově metalurgického Centra</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Baltica X International Conference on Life Management and Maintenance for Power Plants

ISBN

978-951-38-8436-9

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

281-292

Název nakladatele

VTT TECHNOLOGY

Místo vydání

Helsinki

Místo konání akce

Helsinki

Datum konání akce

7. 6. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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