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Advances in Materials Science and Engineering
Volume 2014, Article ID 136059, 9 pages
http://dx.doi.org/10.1155/2014/136059
Research Article

Fatigue Durability Analysis of Collecting Rapping System in Electrostatic Precipitators under Impact Loading

Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778 93855, Iran

Received 29 July 2013; Revised 24 November 2013; Accepted 2 December 2013; Published 12 January 2014

Academic Editor: Martha Guerrero

Copyright © 2014 Ali Akbar Lotfi Neyestanak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Due to the importance of collecting rapping system in electrostatic precipitators (ESP) and controlling the relevant damage under impact loading, fatigue durability of this system is analyzed in the present study based on the numerical and experimental results considering fatigue damage growth and vibration acceleration in the collecting system because of the successive impact of rapping hammers. By microscopic examination of the fracture surface of rapping hammer, beach marks obviously show typical fatigue failure in the rapping hammer arm. In addition, the microscopic examination of the cross section of the collecting plates indicates the corrosion voids which cause crack and eventually fatigue failure. The finite element method is applied to determine both the stress and concentration positions of dynamic stress on the rapping system under impact loading. The paper results can be utilized in system optimization and new material selection for the system by evaluating rapping system durability.