Title: Case study of an evaluation of a Stacker Boom Luffing Pulley by Irwin's model and under BS 7910 guidance

Authors: Jairo A. Martins; István Kövesdy; Estaner C. Romão; Itamar Ferreira

Addresses: Department of Bucking Machines, Handling and Conveyor Components Engineering, Metso Minerals, Av. Independência, 2500 Iporanga, 18087-101 Sorocaba, SP, Brazil. ' Department of Bucking Machines, Handling and Conveyor Components Engineering, Metso Minerals, Av. Independência, 2500 Iporanga, 18087-101 Sorocaba, SP, Brazil. ' Federal University of Itajubá – Itabira – Advanced Campus, Street São Paulo, 377, ITEC – Bairro Amazonas, 35900-373 Itabira, MG, Brazil. ' State University of Campinas – UNICAMP, Street – Mendeleyev, 200, Cidade Universitária Zeferino Vaz, Barão Geraldo, 13083-970 Campinas, SP, Brazil

Abstract: A case study on evaluation of a heavy-duty Stacker Boom Luffing Pulley was presented. Irwin's fracture toughness method and the British Standard were used to help in the decision-making process. Using inspection, discontinuities were found at the first look in the cylinder cross-section at the region of welding of the cylinder ends. A more detailed analysis was conducted by ultrasonic mapping, crossing the cylinder transverse thickness and longitudinal to its length. The final decision took into account accurate analysis of the stress σ1 (Principal Stress) from Finite Element Method (FEM) and σref based on British Standard, and comparing the defect real size and the critical crack size calculated by Irwin equation.

Keywords: ultrasonic mapping; stacker boom luffing pulleys; BS 7910; Irwin equation; failure; heavy-duty pulleys; fracture toughness; stress; finite element method; FEM; critical crack size; metallic structures; structural flaws; flaw acceptability; welding; modelling.

DOI: 10.1504/IJMME.2011.045469

International Journal of Mining and Mineral Engineering, 2011 Vol.3 No.4, pp.267 - 277

Published online: 17 Feb 2012 *

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