We compare two different approaches to the design of 1-3 piexocomposites with optimal performance characteristic for hydrophone applications. The performance characteristics we focus is the hydrostatic charge coefficient d_h~((*)). The piezocomposite consists of piezoelectric rods embedded in an optimal polymenr matrix. In the first approach, we allow the material parameters of the polymer matrix to be free design variables and we find the polymer parameters which give the optimal hydrophone performance. In the second approach, we use the topology optimization method to design the optimal (porous) matrix microstructure. Using the former approach, we find theoretical bounds for hydrophone behavior and using the latter, we design practically realizable but less efficient hydrophones. For both approaches, the optimal transversally isotropic matrix material has negative Poisson's ratio in certain directions.
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