Abstract
Simultaneous full-field strain and temperature measurements were used to monitor tension Split Hopkinson Pressure Bar (SHPB) tests at elevated temperatures. A direct heating system was used to increase the specimen temperature up to 1350 °C. Digital Image Correlation (DIC) and Infrared Thermography (IRT) were used was used to simultaneously monitor the evolution of the full-field strain and temperature of the specimen. Data acquisition was synchronized using a function generator, a camera pinhole model was used to represent both strain and temperature on the same coordinate system, and the displacement vector field from DIC was used to represent both datasets on the same reference frame. The use of fullfield techniques was essential at elevated temperatures, as necking occurred soon after yielding and the usability of the data obtained from the SHPB after the onset of necking is debatable. The method was able to follow the full-field strain and the temperature evolution under extreme conditions. Some challenges were found in the development of the method and recommendations as well as future applications are also described in this paper. This experimental approach is versatile and can be applied to different materials at similar testing conditions but also different loading modes and testing setups.
Highlights
The design and modelling of material behaviour in certain applications, such as airplanes and spacecrafts, must consider the mechanical behaviour of materials at high temperatures and under dynamic loading events [1]
Digital Image Correlation (DIC) enables measurements of localized strains and Infrared Thermography (IRT) allows the measurements of local temperatures during mechanical loading, and a much more comprehensive description of the thermomechanical response of the material to dynamic loading can be described with high spatial resolution
The tensile tests were conducted with a tensile Split Hopkinson Pressure Bar (SHPB) device with a direct electric heating system, which enables rapid heating of the sample to the test temperature
Summary
The design and modelling of material behaviour in certain applications, such as airplanes and spacecrafts, must consider the mechanical behaviour of materials at high temperatures and under dynamic loading events [1]. The use of full-field techniques such as Digital Image Correlation (DIC) and Infrared Thermography (IRT) have become increasingly popular in characterization of dynamic material behaviour. These techniques are powerful and versatile, allowing researchers to investigate complex material behaviour. The use of DIC and IRT for measuring the full-field strains and temperatures at high strain rates and elevated temperatures has not yet been reported on the literature
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