TY - JOUR
T1 - The relation between fatigue crack growth rate and plastic energy dissipation in 7075-T6
AU - Quan, H.
AU - Alderliesten, R. C.
PY - 2021
Y1 - 2021
N2 - Plastic dissipation accompanies fatigue crack growth in ductile materials. Previous studies presented a relation between plastic dissipation (dW/dN) and the fatigue crack growth rate (da/dN), where some researchers assumed a linear relation between both to enable crack growth predictions. To study the validity of this assumption, this paper reports an experimental study on fatigue crack growth in 7075-T6, an alloy widely used in aerospace. The experimental results suggest, however, a nonlinear relation between dW/dN and da/dN in 7075-T6. The value of dW/da, indicating the plastic dissipation per unit fatigue crack growth, is not constant. Hence for 7075-T6 it is concluded that dW/dN cannot be used directly to predict da/dN.
AB - Plastic dissipation accompanies fatigue crack growth in ductile materials. Previous studies presented a relation between plastic dissipation (dW/dN) and the fatigue crack growth rate (da/dN), where some researchers assumed a linear relation between both to enable crack growth predictions. To study the validity of this assumption, this paper reports an experimental study on fatigue crack growth in 7075-T6, an alloy widely used in aerospace. The experimental results suggest, however, a nonlinear relation between dW/dN and da/dN in 7075-T6. The value of dW/da, indicating the plastic dissipation per unit fatigue crack growth, is not constant. Hence for 7075-T6 it is concluded that dW/dN cannot be used directly to predict da/dN.
KW - 7075-T6
KW - Fatigue crack growth
KW - Plastic dissipation
UR - http://www.scopus.com/inward/record.url?scp=85107739137&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2021.107765
DO - 10.1016/j.engfracmech.2021.107765
M3 - Article
AN - SCOPUS:85107739137
SN - 0013-7944
VL - 252
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
M1 - 107765
ER -