engleski

Fatigue Properties of Galvanized Higher-Strength Steel Sheets

The paper analyzes the fatigues properties of galvanized microalloyed steel sheets H220LAD and H380LAD. Under flat bending conditions and the symmetrical cycle, the fatigue limit of the H220LAD sheet is σ Co = ± 152 MPa and that of the H380LAD sheet is σ Co = ± 188 MPa, and the fatigue limit to tensile strength ratio is 0, 41 and 0, 37, respectively. During fatigue tests with an increasing number of cycles or an increasing stress value, the degradation of the zinc coating increases (relief formation, damage of integrity). As a result, local corrosion, but also continuation of fatigue damage after 107 cycles, and hence corrosion fatigue, can take place during operation.

galvanized steel sheet; bending fatigue limit; surface layer degradation

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