A first approach to the analysis of fatigue parameters by thermal variations in static tests on plastics

Impact behaviour of 3-layered metal-polymer-metal sandwich panels

“…These variations in temperature are typically very small, and only recent advances in thermal equipment and photon detectors allowed to measure them efficiently and reliably. During static tensile tests, the temperature trend evidences three stages: an initial temperature increase, a plateau region and then a final further increase in temperature [21]. Analysing this trend, a stress corresponding to the end of the thermoelastic stage, r D (end of the linear decreasing stage of the temperature) can be detected.…”

“…Infrared thermography is a non-contact and non-destructive experimental technique, based on the concept of surface temperature scanning during the application of a mechanical or thermal load to a structural component. In the literature different methods have been developed by means of thermography, initially applied to homogeneous materials [21], and recently applied also to composite structures [22,23]. The attention is focused on the correlation between the thermal response of the material under mechanical loads, either static or dynamic, and the detection of the damage initiation.…”

Influence of delamination on fatigue properties of a fibreglass composite

“…After this initial decrease in temperature, while load increases, temperature deviates from linearity, till a minimum, then it starts to increase. From these experimental observations, some authors related the end of thermoelastic stage to fatigue limit of homogeneous materials [18], or to composite fatigue strength. This value of stress, which can be identified by thermal observations, was named r D , where D stands for damage initiation.…”

An experimental analysis of fatigue behavior of a welded impeller made by FV520B stainless steel in an over-speed preloading process

“…So many attempts have been devoted to estimate the fatigue life of materials or components rapidly, and the IRT method has been proved to be an effective method through nearly thirty years of development [6][7][8][9][10][11][12][13][14][15][16]. The IRT can provide a non-destructive monitoring technology for material degradation by means of observing surface temperature variation of materials [7,8].…”