Case study of an evaluation of a Stacker Boom Luffing Pulley by Irwin's model and under BS 7910 guidance. (20th February 2012)

• Record Type: Journal Article
• Authors: Martins, Jairo A.; Kövesdy;, István; Romão;, Estaner C.; Ferreira, Itamar
• Is Part Of: International journal of mining and mineral engineering. Volume 3:Number 4(2011)
• Page Start: 267
• Page End: 277
• Publication Date: 2012-02-20
• Subjects: 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; Mining engineering -- Periodicals; Mines and mineral resources -- Periodicals; 622.05
• Languages: English
• ISSNs: 1754-890X

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.