Material influence on the stress corrosion cracking of rock bolts

被引：53

作者：

Gamboa, E ^{[1
]}

Atrens, A ^{[1
]}

机构：

[1] Univ Queensland, Div Mat, Sch Engn, Brisbane, Qld 4072, Australia

来源：

ENGINEERING FAILURE ANALYSIS | 2005年 / 12卷 / 02期

关键词：

stress corrosion cracking; rock bolts; threshold stress; hydrogen embrittlement; stress intensity factors;

D O I：

10.1016/j.engfailanal.2004.07.002

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Rock bolt stress corrosion cracking (SCC) has been investigated using the linearly increasing stress test (LIST). One series of experiments determined the threshold stress of various bolt metallurgies (900 MPa for 1355AXRC, and 800 MPa for MAC and MA840B steels). The high values of threshold stress suggest that SCC begins in rock bolts when they are sheared by moving rock strata. SCC only occurred for environmental conditions which produce hydrogen on the sample surface, leading to hydrogen embrittlement and SCC. Different threshold potentials were determined for a range of metallurgies. Cold work was shown to increase the resistance of the steel to SCC. Rock bolt rib geometry does not have a direct impact on the SCC resistance properties of the bolt, although the process by which the ribs are produced can introduce tensile stresses into the bolt which lower its resistance to SCC. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：201 / 235

页数：35

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