Validation of a model material to study flaw characterisation in cleavage

Bezensek, B. (2008) Validation of a model material to study flaw characterisation in cleavage. In: 2007 Proceedings of the ASME Pressure Vessels and Piping Conference - Materials and Fabrication. ASME: New York, pp. 363-368. ISBN 9780791842843;

Abstract

Multiple or complex flaws are typically assessed using flaw assessment procedures, such as BS7910 [1] or ASME Boiler code, Section XI [2]. Such procedures may involve replacing real flaws with simplified flaws in a process of flaw characterisation. Recent work by Bezensek and Hancock [3,4] and Wilkes [5] demonstrated potential lack of conservatism in flaw characterisation procedure when applied to brittle fracture from complex flaws forming a re-entrant sector. In this paper a novel technique is discussed to study flaw characterisation in cleavage. The technique consists of exposing a transparent model material to a controlled thermal shocks produced by a high power laser. The shock locally cracks the material and produces an embedded crack. The objective of the current work is to validate the technique and the model material by performing fracture tests on configurations with twin and complex flaws and corresponding bounding semielliptical flaws using Perspex as a model material. The results show a similar non-conservatism in the characterisation procedure applied to the model material to that reported by Bezensek and Hancock [4] and Wilkes [5] on a mild steel at low temperatures. It is concluded that the above technique and model material accurately represent flaw characterisation under simulated cleavage conditions.

• Item Type: Book Sections
• Additional Information: 2007 ASME Pressure Vessels and Piping Conference, PVP 2007, July 22, 2007 - July 26, 2007, San Antonio, US
• Status: Published
• Glasgow Author(s) Enlighten ID: Bezensek, Dr Bostjan
• Authors: Bezensek, B.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Publisher: ASME
• ISBN: 9780791842843