MS layer embedded in a symmetric laminate
If no other external force is applied, the average strain may be expressed as
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(31.9) |
Strain in MS layer and composite host are same. Putting the value of strain  in Equation (31.1) and solving for stress  ,
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(31.10) |
Putting 
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(31.11) |
Magnetic induction B, in MS layer due to stress on it may be written using Equation (31.2)
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(31.12) |
The open circuit voltage in the sensing coil could be obtained as
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(31.13) |
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Here, n is the number of turns of magnetizing coil per unit length, l the total length, ar area of the cross-section of the coil and  is the frequency.
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