Determination of the resistance of modern structural materials containing cracks to
possible fatigue damages is important in evaluating the structures in terms of design and
performance and to ensure a safe operation of the materials with cracks. Structures
with damage/crack tolerance can be designed by prediction of crack growth lives of
materials accurately and precisely. In this study, analytical investigations
are performed to study the role of equivalent stress intensity factor range
()
equation in the modified Paris’ law on prediction of the crack growth lives of cracked
nonhomogeneous materials. The fatigue damage models are examined using the
numerical and experimental data from literature reported for inclined cracked steel
plates strengthened with carbon fiber reinforced polymer (CFRP) patch and
two-phase composite material with slant interface. Results show that the
model
plays a remarkable role on prediction of the crack growth lives.
