Infrared stroboscopy - A method for the study of thermomechanical behaviour of materials and structures at high rates of strain
Abstract
An experimental infrared stroboscopy technique has been proposed for studying materials and structures under cyclic loads, making the quantification of adiabatic temperature variations possible during deformations. A double stroboscope was constructed whereby fast temperature variations about a mean value could be measured at frequencies up to several cycles per second. It was constructed on the principle of interrupting the video signal by means of analog gate controlled by a flip-flop synchronized with the periodic excitation signal. Various metal alloy samples have been subjected to stroboscopic examination, including a 60-mm-wide titanium sheet, where elastoplasticity and cracking were observed, and polymer specimens, where viscoelasticity and the average dissipation of mechanical energy into heat were evidenced. The method also provides valuable data for crack propagation investigation, and opens the way to fundamental experimental research on temperature-deformation relationships at high rates of loading. It locates areas of maximum stress, detects incipient plastic deformations and cracks and follows their development in structures regardless of their complexity.
- Publication:
-
International Journal of Solids and Structures
- Pub Date:
- 1981
- Bibcode:
- 1981IJSS...17..531B
- Keywords:
-
- Crack Propagation;
- Cyclic Loads;
- Infrared Radiometers;
- Stroboscopes;
- Structural Strain;
- Thermomechanical Treatment;
- Adiabatic Conditions;
- Elastoplasticity;
- Strain Rate;
- Stress Distribution;
- Stress Measurement;
- Temperature Profiles;
- Tensile Stress;
- Titanium;
- Viscoelasticity;
- Instrumentation and Photography