Abstract
The relationship between the strain mode and the displacement mode for vibrating elastic structures is derived. It is based on the idea that when a structure is subjected to dynamic loading, its strain response can be expressed by the superposition of contributions from the “natural strain modes ”. Both the natural strain and natural displacement modes represent the dynamic characteristics of a vibrating structure. By using the finite element method, it has been possible to relate the Strain Frequency Response Function (SFRF) to the Displacement Frequency Response Function (DFRF). The technique used in the modal strain test and the method used for parameter identification are described. An experimental study of the modal strain analysis of cantilever rectangular thin plates has been performed. This shows that the strain mode is more sensitive to local changes of the structure than the displacement mode.
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