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6 May 1994 Active damage mitigation in composite structure by actuation of piezoceramic patches
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Damage in the form of local cracks or distributed microcracks causes a reduction of natural frequencies and increase in vibration damping. Natural frequency measurements are a very attractive form of damage detection tests since they can be made at a single point on the component and are independent of position chosen. Since this change in natural frequencies is due a localized reduction of stiffness due to damage anywhere in the structure, if the natural frequencies are shifted back to their undamaged values, it can be said that the local stiffness in the damaged region should be increased to the stiffness of the undamaged region. So damage mitigation can be taken as a dynamic pole placement problem. Considerable work has been done and very good results have been obtained in detecting damage by analyzing the modal test data from a bonded piezoceramic sensor after the structure has been excited with a sine sweep using a bonded piezoceramic actuator. Now work is going on in actuating the piezoceramic patches to reduce the dynamic moment in the damaged region for stress alleviation.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Abu S. Islam and Kevin C. Craig "Active damage mitigation in composite structure by actuation of piezoceramic patches", Proc. SPIE 2190, Smart Structures and Materials 1994: Smart Structures and Intelligent Systems, (6 May 1994);

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