Environmental influence on the stress corrosion cracking of rock bolts

Gamboa, E. and Atrens, A. (2003) Environmental influence on the stress corrosion cracking of rock bolts. Engineering Failure Analysis, 10 5: 521-558. doi:10.1016/S1350-6307(03)00036-0

Author Gamboa, E.
Atrens, A.
Title Environmental influence on the stress corrosion cracking of rock bolts
Journal name Engineering Failure Analysis   Check publisher's open access policy
ISSN 1350-6307
Publication date 2003-10-01
Year available 2003
Sub-type Article (original research)
DOI 10.1016/S1350-6307(03)00036-0
Open Access Status Not yet assessed
Volume 10
Issue 5
Start page 521
End page 558
Total pages 38
Place of publication Oxford
Publisher Elsevier Ltd.
Language eng
Subject C1
321021 Psychiatry
730211 Mental health
291400 Materials Engineering
291499 Materials Engineering not elsewhere classified
671199 Transport equipment not elsewhere classified
Abstract In order to understand rock bolt Stress Corrosion Cracking (SCC), a series of experiments have been performed in Linearly Increasing Stress Test (LIST) apparatus. One series of experiments determined the threshold stress of various bolt metallurgies (900 MPa for Steel A, and 800 MPa for Steel B and C). The high values of threshold stress suggest that SCC begins in rock bolts when they are sheared by moving rock strata. Typical crack velocity values have been measured to be 2.5 x 10(-8) m s(-1), indicating that there is not much benefit for rock bolt steel of higher fracture toughness. Another series of experiments were performed to understand the environmental conditions causing SCC of steel A and galvanised Steel A rock bolt steel. SCC only occurred for environmental conditions for which produce hydrogen on the sample surface, leading to hydrogen embrittlement and SCC. Fracture surfaces of LIST samples failed by SCC were found to display the same fracture regions as fracture surfaces of rock bolts failed in service by SCC: Tearing Topography Surface (TTS), Corrugated Irregular Surface (CIS), quasi Micro Void Coalescence (qMVC) and Fast Fracture Surface (FFS). Water chemistry analysis were carried out on samples collected from various Australian mines in order to compare laboratory electrolyte conditions to those found in underground mines.
Keyword Engineering, Mechanical
Materials Science, Characterization & Testing
Stress Corrosion Cracking
Rock Bolts
Linearly Increasing Stress Test (list)
Q-Index Code C1
Institutional Status UQ

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Created: Mon, 13 Aug 2007, 23:47:18 EST