Abstract
The self-heating effect is a dangerous phenomenon that occurs in polymers and polymer matrix composites during their cyclic loading, and may significantly influence structural degradation and durability as a consequence. Therefore, an analysis of its criticality is highly demanding, due to the wide occurrence of this effect, both in laboratory fatigue tests, as well as in engineering practice. In order to overcome the problem of the accelerated degradation of polymer matrix structures, it is essential to evaluate the characteristic temperature values of self-heating, which are critical from the point of view of the fatigue life of these structures, i.e., the temperature at which damage initiates, and the safe temperature range in which these structures can be safely maintained. The experimental studies performed were focused on the determination of the critical self-heating temperature, using various approaches and measurement techniques. This paper present an overview of the research studies performed in the field of structural degradation, due to self-heating, and summarizes the studies performed on the evaluation of the criticality of the self-heating effect. Moreover, the non-destructive testing method, which uses the self-heating effect as a thermal excitation source, is discussed, and the non-destructivity of this method is confirmed by experimental results.
Highlights
The self-heating effect is one of the most dangerous phenomena during the operation of elements and parts of machines that are made of polymers and polymer matrix composites (PMCs) that are subjected to cyclic loading or extensive high-magnitude vibrations
Extensive studies studies on on the the evaluation evaluation of of the the criticality criticality of of the the self-heating self-heating effect effect described described in in the the previous subsection need to be summarized, in order to evaluate the most sensitive methods for previous subsection need to be summarized, in order to evaluate the most sensitive methods for the the determination determination of of this this characteristic characteristic temperature, temperature, as as well well as as to to define define safe safe self-heating self-heating temperature temperature ranges, which allow for the operation and non-destructive testing of polymeric and PMC
For enhancing enhancing the the detectability detectability of of damage, damage, numerous numerous image image processing processing methods were developed and applied to the resulting sequences of thermograms, which resulted methods were developed and applied to the resulting sequences of thermograms, which resulted in the increase of the sensitivity of self-heating-based vibrothermography (SHVT) to various types of damage occurring in polymeric and PMC
Summary
The self-heating effect is one of the most dangerous phenomena during the operation of elements and parts of machines that are made of polymers and polymer matrix composites (PMCs) that are subjected to cyclic loading or extensive high-magnitude vibrations. The self-heating effect in such a case follow the non-stationary scenario, and the appearance of a slope on the temperature history plot in the second phase is a result of mechanical degradation of a structure [6], which, in the end, characterized by a slope, but retains linear characteristic (see Figure 4). The self-heating effect in such a case follow the non-stationary scenario, and the appearance of a slope on the temperature history plot in the second phase is a result of mechanical degradation of a structure [6], which, in the end, results in the progressive development of damage in the form of voids and microcracks [37,38,39]. This paper summarizes over 10 years of the author’s studies on the self-heating effect
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