The expected result was that the power absorption
coefficient must be between 0 and 1. The power absorption coefficient ? for the two frequencies is approximately
equal to 1, because the nett active power  and the
incident (input) power   are in phase and therefore the power is always
positive. This means that  and  are equal,
which results that ? is 1. This means
the amount of energy that goes into the test plates is completely absorbed. In
figure 1 can also be seen that and  have an equal
amplitude at any frequency value. These two waves oscillate together and their
function reach a 0 value for the same frequency value and these are both in the
positive side of the graph. This results in a resonance betweenand .

? is 1, this means the amount of power that is put in
at the excitation point is equal to the amount of power dissipated. So the PZT
is placed on a location where the amount of power is fully absorbed. When the
composite structure is excited in a resonance frequency, the power is absorbed
efficiently and the power absorption coefficient will be 1. This is also the case
here and this proves the hypothesis is correct. This concludes that there is a
relation between the power absorption coefficient and electrical impedance
testing to identify damage in composites.

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According to Grafen 2,
the study of van Dijk & van Dijk 5 was based on the
expectation that a delamination in a composite would absorb all the energy and
not reflect any energy. In figure 1, it can be seen that this is the case and
the expectation is met in this research.

The expected result was that the power absorption
coefficient must be between 0 and 1. The power absorption coefficient ? for the two frequencies is approximately
equal to 1, because the nett active power  and the
incident (input) power   are in phase and therefore the power is always
positive. This means that  and  are equal,
which results that ? is 1. This means
the amount of energy that goes into the test plates is completely absorbed. In
figure 1 can also be seen that and  have an equal
amplitude at any frequency value. These two waves oscillate together and their
function reach a 0 value for the same frequency value and these are both in the
positive side of the graph. This results in a resonance betweenand .

? is 1, this means the amount of power that is put in
at the excitation point is equal to the amount of power dissipated. So the PZT
is placed on a location where the amount of power is fully absorbed. When the
composite structure is excited in a resonance frequency, the power is absorbed
efficiently and the power absorption coefficient will be 1. This is also the case
here and this proves the hypothesis is correct. This concludes that there is a
relation between the power absorption coefficient and electrical impedance
testing to identify damage in composites.

According to Grafen 2,
the study of van Dijk & van Dijk 5 was based on the
expectation that a delamination in a composite would absorb all the energy and
not reflect any energy. In figure 1, it can be seen that this is the case and
the expectation is met in this research.