Damageability of structural materials under stress-corrosion conditions

Autor: Ya. A. Gokhberg, A. V. Gur'ev, D. A. Avidon
Rok vydání: 1979
Předmět:
Zdroj: Soviet Materials Science. 15:138-142
ISSN: 1573-885X
0038-5565
DOI: 10.1007/bf00716249
Popis: The level of damage accumulated by the material was estimated from the change in the tensile strength. To obtain statistically reliable results the size of the selection at each point was not less than 50 specimens. Polygons were constructed for the distribution of the tensile strength values; the nonuniformity of properties along the wires was estimated from the mean-square deviation of the tensile strength S while the deviations from the normal distribution law were characterized by the asymmetry and excess coefficients [5]. The change of state of the surface layer of the bimetallic wire, associated with the rupture of the cladding layer, was observed by measuring the electrode potentials [6]. As shown by visual examination of the specimens of galvanized steel tested under constant loading (regime II), the continuous zinc coating was retained on the surface of the wire over the course of 30,000 h, whereas for repeated-static loading (regimes III and IV) the continuous layer of zinc was retained on the surface of the wire only for a period of not more than 9000 h, the wire subsequently being coated with rust and the area of its cross section being reduced substantially but not uniformly, along its length.
Databáze: OpenAIRE
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