STRESS CORROSION CRACKING FAILURE OF INLAND 303 STAINLESS STEEL ANCHOR BOLT: BOLT AND ROCK CHARACTERISTICS INFLUENCE
DOI:
https://doi.org/10.5380/geo.v81i1.96108Palavras-chave:
Inselberg, Stress corrosion cracking (SCC), Manganese sulfide, 303 stainless steel, anchor bolt,Resumo
A serious climbing accident, in the Brazilian city of Itatim - BA, was caused by the rupture of four anchor bolts after the athlete stopped at an anchor point to rest. Bolt fracture characteristics suggest failure by stress corrosion cracking (SCC), however the great distance from major sources of aggressive agents and the low age of the anchor bolt are concerning. The objective of the work is to evaluate the failure causes focusing specifically on rock and bolt characteristics. Laboratorial results indicate typical composition of a 303 SS, rich in MnS, high levels of residual stress from manufacture and relevant concentrations of Chloride along the bolt cracks. Rock analysis shows no aggressive component in its composition. The investigation concluded that high ion concentrated water inside the hole, along with low corrosion resistance of the bolt material, 303 SS, were the main factors that contributed for the SCC failure. No evidence that supports the influence of the rock characteristics was found.
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