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Sensitivity for fracture from defects in wires of bridge suspension cables

Sammendrag

The suspension cables of the Lysefjord Bridge in Norway are an example of long term development of wire fractures. During the sixteen years of operation about 1600 wire fractures have been registered in the outer layer of the Z-wire. The accumulation of wire fractures follows so far a quite linear development. This long term development is created by atomic hydrogen diffusion causing hydrogen embrittlement (HE) and is not linked to any corrosion mechanism of the wire. The origin of the wire fractures is surface defects, typical overlap shear defects, created during the forming process of the Z-wires. A new basis for fracture toughness testing, fracture assessment and defect tolerance on suspension cables is presented, as the reduced fracture toughness from HE increases the sensitivity for fracture

Kategori

Vitenskapelig foredrag

Språk

Engelsk

Forfatter(e)

Institusjon(er)

  • SINTEF Industri / Materialer og nanoteknologi
  • Norges teknisk-naturvitenskapelige universitet
  • Statens vegvesen Vegdirektoratet

Presentert på

The 8th International cable supported bridge operators' conference, Edinburgh, Scotland

Dato

03.06.2013 - 05.06.2013

År

2013

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