This paper newly develops a method for the damage severity estimate for lattice structures based on the employment of the substructure potential energy (SPE). While all existing damage severity estimation methods that utilize modal data are either employing an iterative solution procedure or requiring spatially complete information, the SPE method is an exact, noniterative solution method and only requires substructure modal data. The performance of the proposed method is presented for beam-type and plate-type lattice structures based on synthetic data generated from finite element models.

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