8th European Workshop On Structural Health Monitoring (EWSHM 2016)
5-8 July 2016, Spain, Bilbao
Right Now in Bilbao 10:27 Fri 28
16:00 Wednesday 6. Jul - A1
An update of the probabilistic reliability assessment of welding component based in inspections
Abstract »A methodology for the design of aeronautical components with structural health monitoring requirements is proposed. The method implements a damage detection and characterization strategy based in reliability analysis supported in validated finite element models and an analytical tool is used to perform numerical experiments where the flaws are introduced through computer simulation. The approach allows distinguishing between the manufacturing defectology and late failures, due to of the unavoidable aging and degradation resulting from operational environments. The approach considers too: first, manufacturing process, material properties, and loads; second, 2nd inspections during components life to update the reliability based in the findings, and the correlation with specific component dimensions and characteristics. An electron beam welded jet engine support structure is taken as an example. The welded features are the areas that focus most of the manufacturing service life inspections. Several parameters are studied: manufacturing parameter like Beam size and power, material properties, welding root and crown geometry, head affected zone size, size and number of defects occurrence, X-Ray and FPI capability. An original normalization process of the parameters was performed, in order to have a good representation in very low failure probability situations. The failure probability assessment to obtain the mean time between inspection is established upon a First Order Reliability Method (FORM), in which the failure probability is based in a state equation expressed as the difference between two terms: first, the size of the defect in the component throughout the operation condition, obtained from an integrated Paris equation, and using as an input the uncertainties defined by the manufacturing process and subsequence inspection; and second, defect critical size that disables the component for proper operation, affected by the same uncertainties. To compare the impact of corrective actions and original manufacturing defects on the reliability, a partial reserve factor is analyzed to get the relevance of the uncertainties. Additionally Inverse FORM methodology will be used to decide the next inspection intervals to have a robust structural health monitoring, considering the periodically updated information from inspections and corrective action.
AuthorsCoro, Armando*Coro, Armando*
+34 661 13 04 29
Armando Coro is mechanical engineer by the University of the Basque Country in Bilbao. He has 20 years’ experience in the jet engines and gas turbines industry. Most of the time in ITP “Industria de turbo propulsores ” ITP, focus in the structural analysis with experience in areas like simulation, vibrations, components life, CAM computer assistant manufacturing, and Design for manufacturing technologies. Now he is technical assistant fellow of structural analysis in ITP, in the Mechanical technology department of ITP. Simultaneously from 2006 he is professor of applied mechanics in the BaskCountry University, in which he is researching in reliability of airplane estructures, and new manufacturing and inspection technologies.
ITP Industria de Turbo Propulsores S.A
Mechanical technology department, ITP
(+34) 94 466 2910Aguirrebeitia, JosuAguirrebeitia, Josu
University of the Basque Country
Dpto. Ing. Mecánica, ETSII Bilbao
SpainLópez De Lacalle, Luis NorbertoLópez De Lacalle, Luis Norberto
University of the Basque Country
Dpto. Ing. Mecánica, ETSII, Bilbao.