TY - CONF A1 - Madia, Mauro A1 - Foletti, S. A1 - Beretta, S. A1 - Cavalleri, E.A. T1 - A tool for the structural integrity assessment of turbine disks: probabilistic and numerical background T2 - ASME Turbo Expo 2013 - GT2013 (Proceedings) N2 - Rotor disks for gas turbines are heavy components and are usually designed following a safe-life approach, where the low-cycle fatigue analysis is carried out referring to design life curves with suitable probabilistic margins. However, in the case of such a heavy component there is the possibility of rare occurrence of undetected defects or, better, the need to identify the defect acceptability for the different rotor regions (considering stress, temperature, mission profile).In order to carry out such calculations for a turbine rotor disk a software named AStrID (Assessment of the Structural Integrity of Disks) has been developed in close cooperation between Politecnico di Milano and Ansaldo Energia (AEN). This paper summarizes its background and some of the relevant features. T2 - ASME Turbo Expo 2013 - GT 2013 CY - San Antonio, TX, USA DA - 03.06.2013 PY - 2013 SP - GT2013-96029, 1-8 AN - OPUS4-29456 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Madia, Mauro A1 - Foletti, S. A1 - Torsello, G. T1 - On the applicability of the small punch test to the characterization of the 1CrMoV aged steel: Mechanical testing and numerical analysis JF - Engineering failure analysis N2 - The life extension of a component in service is of great importance in many engineering applications and it relies on the possibility of monitoring the material degradation during in-service loading. In this view, non-destructive testing is needed in order to be able to evaluate the material properties while keeping the component in service. The present work focuses on a miniature mechanical test named small punch test, which has been employed on virgin and aged 1CrMoV steel in order to characterise its mechanical behaviour. A thorough experimental analysis has been carried out using classical and miniature mechanical tests and the results have been compared in order to evaluate the feasibility of the small punch test to the characterisation of an aged steel. A numerical framework based on finite element simulations is also presented to support the findings of the experimental tests. Starting from the simulation of a typical load–displacement curve given by the small punch test, the elastic–plastic parameters have been identified and applied in the simulation of the tensile tests. Experimental results and non-uniqueness of the mathematical problem associated to the identification of the material parameters are discussed. KW - Small punch test KW - 1CrMoV KW - Aged steel KW - Steam turbine KW - Failure analysis PY - 2013 DO - https://doi.org/10.1016/j.engfailanal.2013.07.028 SN - 1350-6307 SN - 1873-1961 VL - 34 SP - 189 EP - 203 PB - Elsevier Science Publ. CY - Oxford AN - OPUS4-29471 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -