CORROSION AND EMBRITTLEMENT IN HIGH-STRENGTH WIRES OF SUSPENSION BRIDGE CABLES

An in-depth analysis of the deterioration mechanisms in high-strength wires of suspension bridge cables is presented. Accelerated cyclic corrosion tests were conducted to assess the relative effect of corrosion on galvanized and ungalvanized wires. Samples were corroded under various levels of sustained loads in a cabinet that cyclically applied an acidic salt spray, dry conditions, and 100% relative humidity at elevated temperature, and mass loss, hydrogen concentration, ultimate load, and elongation at failure were measured. Elongation measurements indicated a significant embrittlement of the wires that could not be explained solely by the presence of absorbed hydrogen (hydrogen embrittlement). The main cause of reduction of wire elongation was found to be the surface irregularities induced by the corrosion process. The experimental results were validated through a numerical analysis using a finite-element method model of the corroded steel wire and through a series of scanning electron microscope analyses of the fracture surfaces.

[1]  Theodore Hopwood,et al.  Inspection, Prevention, and Remedy of Suspension Bridge Cable Corrosion Problems , 1984 .

[2]  M. Elices,et al.  Influence of residual stresses on hydrogen embrittlement susceptibility of prestressing steels , 1991 .

[3]  Herbert Herman,et al.  Treatise on Materials Science and Technology , 1979 .

[4]  R. A. Oriani,et al.  Hydrogen degradation of ferrous alloys , 1985 .

[5]  R. A. Oriani,et al.  Equilibrium and kinetic studies of the hydrogen-assisted cracking of steel , 1977 .

[6]  M. Elices,et al.  Hydrogen Embrittlement of Pearlitic Steels: Phenomenological Study on Notched and Precracked Specimens , 1991 .

[7]  A. Nádai.  Theory of flow and fracture of solids , 1950 .

[8]  P. Sofronis,et al.  Numerical analysis of the interaction of solute hydrogen atoms with the stress field of a crack , 1996 .

[9]  P. Timmins,et al.  Solutions to Hydrogen Attack in Steels , 1997 .

[10]  Frank L. Stahl,et al.  Cable Corrosion in Bridges and Other Structures: Causes and Solutions , 1996 .

[11]  M. Elices,et al.  The role of local strain rate in the hydrogen embrittlement of round-notched samples , 1992 .

[12]  Raimondo Betti,et al.  ACCELERATED CORROSION AND EMBRITTLEMENT OF HIGH-STRENGTH BRIDGE WIRE , 2000 .

[13]  R M Mayrbaurl,et al.  CRACKING AND FRACTURE OF SUSPENSION BRIDGE WIRE , 2001 .

[14]  R. McMeeking,et al.  Numerical analysis of hydrogen transport near a blunting crack tip , 1989 .

[15]  D. J. Carney,et al.  Hydrogen embrittlement of SAE 1020 steel , 1950 .

[16]  D. Hull,et al.  Fractography: Observing, Measuring and Interpreting Fracture Surface Topography , 1999 .

[17]  H. Huang,et al.  Hydrogen Embrittlement Interactions in Cold-Worked Steel , 1995 .

[18]  Guk-Rwang Won.  American Society for Testing and Materials , 1987 .

[19]  Lawrence E. Eiselstein,et al.  Atmospheric Corrosion of the Suspension Cables on the Williamsburg Bridge , 1987 .

[20]  Sw Dean,et al.  Degradation of Metals in the Atmosphere , 1987 .

[21]  R. A. Oriani,et al.  Equilibrium aspects of hydrogen-induced cracking of steels , 1974 .