engleski

Middle-wave infrared thermography as a tool for tracing structural changes during impact loading of cellular materials

Impact energy transition from moving impactor to impacted body is followed by energy absorption trough material plastification, intercellular contact and significant heat generation. In cellular materials, the deformation and collapse mechanism depends on several parameters, namely the base material, the applied strain rate, the characteristics of cellular structure (e.g. cellular architecture, pore size and pore shape) and the location of local deformation front. The understanding of this mechanism is important for predicting the impact response of these materials. Infrared thermography based on cooled middle-wave high frame rate detectors is a powerful tool capable of tracing impact deformation trough local heat generation. Propagation of plastic front, typical for cellular materials, can be clearly distinguished as well as formation of shear bands, crack localization and propagation, all providing important information about the collapse mechanism.

Open-cell cellular structure; Infrared themography; Plastification propagation

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