[en] The purpose of this Master's Thesis is to develop and demonstrate the validity of a digital twin for the prediction of the remaining useful life of a structure analogous to the bed of a press, whose failure mode is the initiation and propagation of cracks caused by fatigue. To this end, firstly, the simplified structure is designed and optimised so that its geometry and failure mode are representative of the real press and, in turn, can be tested with the means available. A sensor system is also proposed for monitoring the structure, which will allow the digital twin to be fed. Regarding the methodologies implemented, the crack initiation phase is calculated following the standards "DNVGL-ST-0361" [1] and "Recommendations for Fatigue Design of Welded Joints and Components" [2] by the IIW (International Institute of Welding), by means of the Palmgren-Miner damage accumulation. Likewise, crack propagation is estimated according to the guidelines of BS 7910:2013+A1:2015 [3] about methods for assessing the admissibility of cracks in metallic structures, by integrating the Paris law, starting from a postulated initial crack up to the predicted fracture based on the Failure Assessment Diagram. On its part, the digital twin, implemented in Python language, performs predictions considering especially the critical welded joints of the structure. It consists of three main modules: 1) Virtual sensing for the estimation of stresses in critical areas based on deformations of remote points. 2) Initiation module to calculate the time to crack appearance at critical points of previously specified welds, i.e. the initiation life. 3) Propagation module for the prediction of the remaining life of the structure until fracture, by calculating the propagation of potential cracks. Finally, a series of simulations are carried out that consider different scenarios of crack size update by the user, uncertainty of the experimental measurements, etc., with the purpose of demonstrating the validity of the digital twin.

[eu] Master Amaierako Lan honen asmoa, prentsa baten bankadaren egitura analogo baten gainerako bizitza erabilgarriaren aurreikuspenerako biki digital bat garatzea eta bere baliotasuna frogatzea da, zeinaren hutsegite era nekeak eragindako arrakalen hasiera eta hedapena den. Horretarako, lehenik eta behin, egitura sinplifikatua diseinatzen eta optimizatzen da bere geometria eta huts egiteko modua benetako prentsaren adierazgarri izan daitezen, eta, aldi berean, eskura dauden baliabideekin entseguak egin ahal izan daitezen. Egitura monitorizatzeko sentsorizazio bat ere proposatzen da, biki digitala elikatuko duena. Ezarritako metodologiei dagokienez, pitzaduraren hastapen-fasea IIW-ren (International Institute of Welding) "Recommendations for Fatigue Design of Welded Joints and Components" [2] eta "DNVGL-ST-0361" [1] estandarren arabera kalkulatzen da, Palmgren-Minerren min metatzearen bidez. Era berean, pitzaduren hedapena metalezko egituretan arrakalen onargarritasuna ebaluatzeko metodoei buruzko BS 7910:2013+A1:2015 [3] arauaren jarraibideen arabera kalkulatzen da, Parisen legea integratuz, hasieran ezarritako pitzadura batetik abiatuta, Akats Ebaluazio Diagraman oinarrituta aurreikusitako hausturaraino. Bere aldetik, biki digitalak, Python lengoaian inplementatua, aurreikuspenak egiten ditu, bereziki egituraren lotura soldatu kritikoak kontuan hartuz. Honek, hiru modulu nagusi ditu: 1) Sentsorizazio birtuala, gune kritikoetako tentsioak estimatzeko, urrutiko puntuen deformazioetatik abiatuta. 2) Hasierako modulua, aurrez zehaztutako soldaduren puntu kritikoetan pitzadura agertu arteko denbora kalkulatzeko, hau da, hastapeneko bizitza. 3) Hedapen modulua, hausturara arte egituraren gainerako bizitza erabilgarriaren aurreikuspenerako, pitzadura potentzialen hedapena kalkulatuz. Azkenik, simulazio multzo bat egiten da, erabiltzaileak arrakalen tamaina eguneratzean, neurri esperimentalen ziurgabetasunean eta abarretan hainbat egoera kontuan hartuta, biki digitalaren baliozkotasuna frogatzeko helburuarekin.