Risk tolerance mapping in dynamically loaded structures as excitation dependency by means of full-field receptances

A more precise knowledge of the structural responses to specific dynamic loads is here proposed, coupled with advanced failure prediction models for cumulative damage, in the framework of a risk tolerance concept and sub-condition defect acceptance. The approach aims at mapping the specific failure risk in the component body and at grading the danger of each defect, with a proper risk index, as function of the position where it may occur, thus a tool for grading the failure risk as function of the real structural dynamics and boundary conditions of the real component, the excitation location and its dynamic signature. Accurate experiment-based full-field receptance maps underlined the viability of this risk tolerance concept, as high spatial resolution estimations of the real structural dynamics of a lightweight rectangular plate, by means of optical full-field ESPI measurements in a broad frequency band, without any structural FE or analytical models to be accurately tuned. Examples and details are given specifically as the excitation is changed in its dynamic signature, in order to show how the most advanced experiment-based knowledge available can augment the fidelity of the proposed risk tolerance and defect acceptance mapping. Paper ID: 41i_14648_Zan