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Carbon fiber reinforced plastics (CFRPs) have frequently been applied to various
structures because of their light weight, high strength and modulus, and superior
fatigue properties. Damage accumulates in composite structures due to cyclic
loading; stress concentrations induce complex damage states that include ply
cracks and delamination. The accumulation of damage causes the loss of
structural stability and also becomes the source of damage extension. Accordingly,
nondestructive testing systems have been used to ensure structural reliability.
However, current inspection techniques involve complex procedures, which can
be very labor-intensive and expensive.