(DURIP) A MECHANICAL RAMAN SPECTROSCOPY BASED SETUP FOR SIMULTANEOUS DUAL LENGTH AND TIME SCALE SHOCK WAVE PROPAGATION MEASUREMENTS FOR VALIDATING MU
Abstract
The proposed effort offers to build a unique experimental setup that measures constitutive stress-strain-temperature correlation in energetic materials undergoing shock loading at two separate length and timescales simultaneously. For the purpose of description, the first length scale of focus is nanoscale corresponding to material interfaces within less than 10 micrometers. The second length scale is mesoscale spanning from few micrometers to mm. The first time scale is 200 ps (picoseconds) to few ns (nanoseconds) called initiation stage and the second time scale is few ns (nanoseconds) to microseconds called propagation stage. Shock wave propagation is heterogeneous materials involves a complex interplay of length and time scales. It is the intent of the proposed setup to perform shock wave propagation measurements in HMX-HTPB and similar PBX energetic materials at two separate length scale windows simultaneously at the proposed two time scale resolutions, respectively (nanoscale and mesoscale length scale at the initiation and the propagation time scales mentioned here). Dual time and length scale data presented in single shock measurements will provide validation to the multiscale simulations with significantly high fidelity that is not currently possible in any measurement. The overall objectives of the proposed work are- (1) To present validation dataset for MURI multiscale simulations regarding how nanoscale high strain rate behavior is related to mesoscale at the initiation and propagation timescales?; (2) To present validation data regarding how mechanisms observed at one time scale propagate to another timescale under the influence of heterogeneities in the samples; and (3) To present validation data on how the simulations connected across length scales capture uncertainty and variability across the two important length scales and time scales mentioned here. If approved, the resulting equipment will be extremely unique to the world of dynamic material failure prediction offering measurements across multiple length scales simultaneously at both initiation and propagation timescales.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2023
- Source ID
- FA95502110453
Entities
People
- Vikas Tomar
Organizations
- Air Force Office of Scientific Research
- Purdue University
- United States Air Force