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Publication Title | Engineering Solid Mechanics Fatigue analysis for the first row of blades of a micro turbine under full loading cycle using transient modal analysis

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Engineering Solid Mechanics 3 (2015) 145-156

Contents lists available at GrowingScience

Engineering Solid Mechanics homepage: www.GrowingScience.com/esm

Fatigue analysis for the first row of blades of a micro turbine under full loading cycle using transient modal analysis

Ali Soleimania*, Saeid Shahrakib and Hosein Bisadia

aIran University of Science and Technology, Narmak, Tehran, Iran bSchool of Mechanical Engineering, University of Zabol, Iran

ARTICLE INFO

Article history:

Received 6 January, 2015 Accepted 20 May 2015 Available online

22 May 2015

Keywords:

First row of blades Micro turbine

Full loading cycle

1. Introduction

ABSTRACT

In advanced modern turbines, the temperature of the turbine's first blade row which is called the turbine's hot part, increases almost as 1000°C. These blades must operate for long periods of time. Since, the main failure reason of the parts operating under high temperature and cyclic loading conditions is fatigue as well as creeping phenomena, acquiring an accurate estimate of these blades' lifetime under creeping and fatigue interactions is very necessary for theoretical and practical requirements. The fatigue of the first blade row of the micro turbine TRI60 is analyzed in this study. For the purpose of estimating the fatigue lifetime of turbine and motor, heat transfer of blades as well as thermal stress is analyzed at first via ABAQUS software. Consequently, a fatigue analysis under full cycle and within the interval of to is performed using Smith-Watson-Taper algorithm and transient modal analysis via Fe-safe software.

© 2015 Growing Science Ltd. All rights reserved.

One of the most major issues concerning warplanes during their flight time is the turbine blades'

failure due to creeping-fatigue effect. When the blades at unusual high temperatures are put under high

stress, they suffer from creeping effect. At first surface micro cracks are developed due to the slip of

boundary grains. W-shape cracks are created due to the presence of carbide and as well as high amounts

of stress, which in times cause fatigue cracks to germinate. Consequently, the blade fails under low

fatigue cycle (Salam et al., 2002). Chen et al. (2007) predicted the turbine blade's lifetime under

creeping and fatigue effects using modified linear damage summation (MLDS) and Modified strain

range partitioning (MSRP) methods. They first performed an accurate analysis via finite element

method (FEM) considering the maximum thermal load, centrifugal force, and the force caused by

airflow, to evaluate the blade's lifetime. After that, they analyzed the stress-strain response of the low-

cycle fatigue (LCF) as well as creeping-fatigue effect at constant temperature state, plastic hardening,

* Corresponding author.

E-mail addresses: alisoleimani@rail.iust.ac.ir (A. Soleimani)

© 2015 Growing Science Ltd. All rights reserved. doi: 10.5267/j.esm.2015.5.004

Image | Engineering Solid Mechanics Fatigue analysis for the first row of blades of a micro turbine under full loading cycle using transient modal analysis



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