Steam turbine blade failure analysis

Mazur, Z.; García–Illescas, Rafael; Aguirre-Romano, Jorge; Perez-Rodriguez, Norberto

doi:10.1016/j.engfailanal.2006.11.018

Cited by 70 publications

(15 citation statements)

References 2 publications

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“…Often the blade root fillets and disk groove fillets undergo their highest peak stress/strain for every cyclic loading (start up cycle). Therefore some amount of plastic strain gets accumulated each cycle (Mazur, 2008). The total strain accumulated is the sum of the elastic and plastic strain.…”

Section: Fatigue Life Approachmentioning

confidence: 99%

Strength Evaluation in Turbo Machinery Blade Disk Assembly at Constant Speed

Kumar¹,

Prasad²,

Shivarudraiah³

2010

Int J Automot Mech Eng

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In the present work, 3D finite element analyses (FEA) of a low pressure (LP) steam turbine bladed disk assembly are carried out at constant speed loading condition. The prime objective of this work is to optimize the geometry of the bladed disk root with the aid of the Peterson's stress concentration factor (SCF) charts available in the literature. Secondly, design rules are developed for the structural integrity of the blades and disk considering a safety factor for material, manufacturing and temperature uncertainties. These design rules are in turn used as design checks with the aid of finite element analysis results. Special investigations were performed based on Neuber formulae for reducing the local peak stresses at the blade and disk root fillet using linear analysis to identify the equivalent non linear stress values by the strain energy distribution method for estimating the minimum number of cycles required for the onset of crack initiation.

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Section: Fatigue Life Approachmentioning

confidence: 99%

Strength Evaluation in Turbo Machinery Blade Disk Assembly at Constant Speed

Kumar¹,

Prasad²,

Shivarudraiah³

2010

Int J Automot Mech Eng

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“…Martínez et al [2] developed a code in FORTRAN about the velocity distribution in the output of stator blades that have flow conditions of wet steam, in order to understand the causes of erosion on the blades of the last stages in the low pressure section of steam turbines. Mazur [3] mode metallographic analyses of cracked blades, natural frequency tests and analyses, blade stress analyses, unit's operation parameters and history of events analyses, fracture mechanics and crack propagation analyses. Shankar [4] performed a 3D finite element analysis (FEA) of a low-pressure (LP) steam turbine bladed disk assembly at a constant speed loading condition.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation of Stresses Induced at Blade Mounting Locations in Steam Turbine Rotor System

Prasad¹,

Ramana

Rao

2019

International Journal of Applied Mechanics and Engineering

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One of the most common incipient losses of integrity in mechanical structures is the development and propagation of cracks. Especially in rotating members like steam turbine rotors etc. cracks, because of their potential, cause catastrophic failures and are a grave threat to an uninterrupted operation and performance. A crack may propagate from some small imperfections on the surface of the body or inside of the material and it is most likely to appear in correspondence to high stress concentration. Crack propagation path is generally determined by the direction of maximum stress or by the minimum material strength. Hence determination of stresses induced has been the focus of attention for many researchers. In the present work, development of a mathematical model to determine the stresses induced in a rotating disc of varying thickness is studied. This model is applied to a steam turbine rotor disc to determine the induced stresses and radial deflection. The mathematical modeling results are validated with the results obtained using Ansys package. The results of the present study will be useful in diagnosing the location and magnitude of maximum stress induced in the turbine rotor disc and stress intensity factor due to the presence of crack.

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“…[6][7] Different ways to deal with assessing mean anxiety impacts on the strain-life investigation are Morrow strategy and Smith, Watson, and Topper (SWT) technique utilised here to gauge the weakness life of steam turbine sharp edge. [8][9][10] Morrow employing the genuine crack quality is an extensive change.…”

Section: Introductionmentioning

confidence: 99%