An experimental apparatus designed to measure the dynamic behavior of materials under strain rates around 10³ s⁻¹ and temperatures up to 800°C is developed in this study. The system builds upon the traditional Kolsky (split-Hopkinson pressure) bar setup, incorporating an external furnace to heat the specimen to the desired temperature. A synchronized triple pneumatic actuation system is employed to control the motion and timing of the sample, incident, and transmitted bars. The cold contact time (CCT), which is the duration during which the heated sample remains in contact with the room-temperature bars before compression, is experimentally measured and carefully controlled to minimize temperature gradients across the sample and prevent heating of the bars. The experiments are complemented by ultra-high-speed imaging, 2D digital image correlation (DIC), and high-speed thermal imaging. To demonstrate the system’s capability, experiments were conducted on Ti-6Al-4V (wt.%) at temperatures ranging from 25°C to 800°C and an average strain rate of approximately 1200 s⁻¹.
2025-04-09 09:00:00
