TY - JOUR

T1 - Fatigue Assessment of Precorroded AlSi9Cu3 Specimens Incorporating Short Crack Propagation

AU - Oberreiter, Peter

AU - Schönowitz, Markus

AU - Maier, Bernd

AU - Grün, Florian

PY - 2025/2/9

Y1 - 2025/2/9

N2 - This study investigates the fatigue behavior of AlSi9Cu3 aluminum die-cast alloy after exposure to accelerated corrosive condi-tions. It underscores the significant impact of minor localized corrosion imperfections on fatigue strength and presents a numer-ically efficient method for fatigue assessment based on fracture mechanics principles. Fatigue tests under rotary bending loadshowed a 34% reduction in long-life fatigue strength for precorroded surfaces compared to polished ones. Numerical simulations,which treated the precorrosion as a single crack-like surface imperfections, provided good estimates of fatigue life, when usingthe mean corrosion depth as initial flaw depth. Variations in the assessed fatigue strengths for different flaw geometries and sizesranged from 13.7% above to 22.2% below the experimental values. The findings underscore the importance of incorporating shortcrack propagation, particularly for small corrosive defects, in fatigue assessments to enhance accuracy and ensure componentreliability and safety when corrosion-induced imperfections are present.

AB - This study investigates the fatigue behavior of AlSi9Cu3 aluminum die-cast alloy after exposure to accelerated corrosive condi-tions. It underscores the significant impact of minor localized corrosion imperfections on fatigue strength and presents a numer-ically efficient method for fatigue assessment based on fracture mechanics principles. Fatigue tests under rotary bending loadshowed a 34% reduction in long-life fatigue strength for precorroded surfaces compared to polished ones. Numerical simulations,which treated the precorrosion as a single crack-like surface imperfections, provided good estimates of fatigue life, when usingthe mean corrosion depth as initial flaw depth. Variations in the assessed fatigue strengths for different flaw geometries and sizesranged from 13.7% above to 22.2% below the experimental values. The findings underscore the importance of incorporating shortcrack propagation, particularly for small corrosive defects, in fatigue assessments to enhance accuracy and ensure componentreliability and safety when corrosion-induced imperfections are present.

KW - Aluminiumlegierung

KW - Ermüdungsfestigkeit

KW - Bruchmechanik

KW - Kurzrisswachstum

KW - Betriebsfestigkeit

KW - Rissfortschrittssimulation

KW - Materialermüdung

KW - Korrosion

KW - aluminum alloy

KW - corrosion

KW - fatigue

KW - fatigue life prediction

KW - fracture mechanics

KW - rotational bending

KW - Fatigue assessment

KW - crack growth simulation

KW - precorrosion

U2 - 10.1111/ffe.14593

DO - 10.1111/ffe.14593

M3 - Article

VL - ??? Stand: 18. Februar 2025

JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

SN - 8756-758X

IS - ??? Stand: 18. Februar 2025

ER -