Self‐heating of polymeric laminated composite plates under the resonant vibrations: Theoretical and experimental study

Abstract

The self‐heating effect caused by the energy dissipation during vibration of viscoelastic materials is an important criterion in the evaluation of the structural degradation. In this study the theoretical model of the self‐heating of the polymeric layered FRP plate subjected to the resonant vibration was proposed. The model is based on the complex parameters, which could be obtained in DMA tests. The theoretical model is validated in several experiments. The experiment contains two stages: first, the modal analysis was performed for the evaluation of natural frequencies of vibration and further the specimens were excited to harmonic vibration with their resonant frequencies in the constant strain rate mode. During the second stage the force response and evolution of the temperature distributions on the surface of the specimens were registered. Obtained results allow identifying the self‐heating temperature evolution of the composite and determining the relation of the excitation frequency and self‐heating temperature. Several phenomena observed during the experiments were interpreted following their physical nature. Investigated problem could be applied for predicting the structural life of such composites and in diagnostics and structural health monitoring of the parts and constructions made of polymeric composites. POLYM. COMPOS., 2012. © 2011 Society of Plastics Engineers

Thermodynamic entropy generation in the course of the fatigue crack initiation

“…The concept of the FFE has also been used in high-cycle fatigue (HCF) of metals 20 as well as in presence of stress concentration. 3 Fatigue failure assessment based on hysteresis energy and thermal response [21][22][23][24] has been under extensive study during past decades. Both plastic strain energy [25][26][27][28][29][30] and total strain energy [31][32][33][34] have been the focus of a number of studies.…”

Fatigue and Thermal Failure of Polymeric Composites Subjected to Cyclic Loading

“…The maximal temperature on a given thermogram was determined by the point of intersection of previously defined lines of temperature profiles (see Fig.3). Obtained temperature Fatigue and Thermal Failure of Polymeric Composites Subjected to Cyclic Loading evolution curves were approximated using double exponential function used previously in [2,14]:…”

“…Previously, the theoretical fundamentals of the selfheating effect were discovered and presented in [13,14]. The conception of theoretical model of fatigue considering self-heating effect was presented in [15].…”

Thermal and mechanical response of particulate composite plates under inertial excitation

“…While most of the prior work in thermography specifically targets heating near defects, research in this area has also highlighted stressinduced heating along the modal structure of various systems. [9][10][11] As vibrothermography is primarily used in the nondestructive testing of damaged samples, excitation at structural resonance is generally avoided, as heating from modal deflection patterns masks that which is associated with structural damage effects. 12 In the context of the present work, it is expected that modal heating will be more broadly applicable than defect-scale heating.…”