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crack detection.pdf

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FAILURE ANALYSIS TO BLADES OF STEAM TURBINES AT NORMAL CONDITIONS OF OPERATIONS AND RESONANCE A.L. Tejeda 1,a , J.A. Rodríguez 1,b * , J.M. Rodríguez 2,c , J.C. García 1,d , M.A. Basurto-Pensado 1,e 1 Centro de Investigación en Ingeniería y Ciencias Aplicadas – Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa, C. P. 62209, Cuernavaca, Morelos, México. 2 Centro Nacional de Investigación y Desarrollo Tecnológico; Interior Internado Palmira s/n, Col. Palmira, C. P
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  FAILURE ANALYSIS TO BLADES OF STEAM TURBINES AT NORMAL CONDITIONS OF OPERATIONS AND RESONANCE A.L. Tejeda 1,a , J.A. Rodríguez 1,b * , J.M. Rodríguez 2,c , J.C. García 1,d , M.A. Basurto-Pensado 1,e 1 Centro de Investigación en Ingeniería y Ciencias Aplicadas – Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa, C. P. 62209, Cuernavaca, Morelos, México. 2 Centro Nacional de Investigación y Desarrollo Tecnológico; Interior Internado Palmira s/n, Col. Palmira, C. P. 62490, Cuernavaca, Morelos, México 11th International Fatigue Congress, March 2014.  ABSTRACT The need to provide quality services, accurate diagnosis, timely rehab and improvement inmaterials and operation of the turbines, have given way to scientific research crack initiation andyour propagation, the impending fracture and estimating life of the turbine components at normalconditions and resonance.The L-1 stage blades suffer high alternating stresses, for its size, exposure to high temperatures,and mechanical loads under repetitive strain of cyclic load. The last stages of blades are alsosubjected to severe centrifugal loads that, when combined with the alternating loads, the stressesgenerated are responsible for fatigue failures.In this work, the last stage L-1 blades of a steam turbine under cyclic load or fatigue wereanalyzed, in firstly were observed and measured the crack initiation and crack propagation undernormal conditions operation and then in the conditions on resonance.The results show that in resonance conditions the blade material fatigue strength is decreased. Inthe case of the presence of cracks in the blades, its showed that the natural frequency is decreased.  L-0  L-1  L-2 L-3 L-4 L-5 Stageof steamturbineComparativeof frequencies  Time         S       t      r      e      s      s AlternatingstressesMechanicalloadsExperimental blade
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