Abhijeet Dhiman¹, Hao Wang¹, Vikas Tomar¹; ¹Purdue University

Shock induced stress measurements in materials is important to design materials for hypersonic vehicles, accident tolerant nuclear materials, and energetic materials and structures. In this work, a novel experimental setup to measure in-situ dynamic stress induced by impact from a particle moving at hyper-velocity has been used. The stress measurement is performed based on a time resolved in-situ mechanical Raman spectroscopy to measure in-situ dynamic stress in a Hydroxyl-terminated polybutadiene (HTPB) sample. The hyper-velocity particle is accelerated by a pulse. After the impact, the shock propagates through sample inducing dynamic stresses. The high-speed in-situ mechanical Raman spectroscopy uses variation in Raman shift as a function of time to obtain stress induced due to impact for varying strain rates. The Raman spectroscopy is performed at the GHz frequencies with an integration time of a few nanosecond to capture stress-waves induced due to impact.