On evaluating lossy acquisitions of the responses of material hierarchical structures to the applied stress

Lossy acquisitions in time-domain are very much practical, especially, in the fields of solid material characterization and evaluation. These losses are constrained by the acquisition conditions not only involving instrumentation and physics of the measurements, subject to the initial state of status, but also the subsequent variations of these conditions. In this work, we developed two algorithms, the distinct and ensemble, of which the former is based on the direct counts of signal characteristic features used widely in acoustic emission applications; whereas, the latter takes into accounts the statistic ensemble of the acquisitions. The distinct algorithm is for its simplicity, the ensemble one is more comprehensive and informative. It was found that the lossiness is dependent strongly on the mentioned conditions. Furthermore, this work shows that early damage, a largely ignored issue by the community of mechanics, plays a significant role in the performance of a solid material.

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► Lossy acquisitions are unavoidable and critical in characterizing material behavior.
► Two algorithms were developed to evaluate the losses.
► The distinct algorithm is simple, the ensemble one is comprehensive and informative.
► The lossiness is dependent strongly on the mentioned conditions.