High-cycle notch sensitivity of alloy steel ASTM A743 CA6NM used in hydrogenator turbine components
Journal Title: Frattura ed Integrità Strutturale - Year 2010, Vol 4, Issue 14
Abstract
The presence of notches and other stress concentrations in turbine blades and other notch hydraulic components is a current problem in engineering. It causes a reduction of endurance limit of material. In that sense, specimens of the ASTM A743 CA6NM alloy steel using in several hydrogenator turbine components was tested. The specimens were tested under uniaxial fatigue loading with a load ratio equal to -1, and the considered stress concentration factors, Kt, values, calculated with respect to net area, were 1.55, 2.04 and 2.42. In order to determine the fatigue limit for such notch type, a reduction data method by Dixon and Mood, Staircase method was used. This approach is based on the assumed target distribution of the fatigue limit. For such geometry at least 8 specimens were tested. In addition, the Peterson and Neuber’s notch fatigue factor were compared through fatigue notch reduction factor, Kf, obtained from experimental data. According to results obtained it was possible to conclude that the tested material is less sensitive to notches than the prediction of the Peterson and Neuber’s empirical models.
Authors and Affiliations
B. L. da Silva, J. L. de ALmeida Ferreira, J. A. Araùjo
Keywords
Related Articles
- EP ID EP119289
- DOI 10.3221/IGF-ESIS.14.04
- Views 49
- Downloads 0
Methodological developments in the field of structural integrity analyses of large scale reactor pressure vessels in Hungary
Buildings, structures and systems of large scale and high value (e.g. conventional and nuclear power plants, etc.) are designed for a certain, limited service lifetime. If the standards and guidelines of the time...
Crack growth simulation in heterogeneous material by S-FEM and comparison with experiments
Fully automatic fatigue crack growth simulation system is developed using S-version FEM (SFEM). This system is extended to fracture in heterogeneous material. In the heterogeneous material, crack tip stress field...
Mechanical characterization of metal-ceramic composites
Metal-ceramic composites represent a class of quasi-brittle materials for advanced structural applications that require adequate mechanical characterization. Difficulties and costs associated with material production and...
Sulla stima di macro, micro e nano-durezza di materiali metallici mediante analisi elasto-plastiche agli elementi finiti
Il lavoro sintetizzato nel presente articolo si pone come obiettivo primario quello di investigare la possibilità di stimare, mediante un approccio elasto-plastico agli elementi finiti, la durezza dei materiali met...
Studio delle prestazioni di giunzioni incollate ibride
Le giunzioni ibride sono giunzioni in cui coesistono due differenti tipologie di giunzione, di cui una è l’incollaggio. L’articolo mostra i risultati di una campagna sperimentale volta a caratterizzare le prestazioni di...