Damage and Temperature around a Propagating Dynamic Crack
Abstract
Dynamic fracture is a critical impact energy dissipation mechanism in armors under impact. However, the fundamental energy-dissipating mechanisms are still not well developed to achieve armor-materials-by design capability. Due to the limitations in experimental methods, the dynamic damage field and the associated temperature field have not been investigated in real time at high spatial resolutions. We propose an experimental research program to study the damage and temperature fields around a running crack tip using two cxperirnental methods we recently developed. The goal of this proposed Research Program is to visualize the damage and temperature fields in real time around a propagating crack tip. To vary the dynamic loading rates, the crack will be driven by a Kolsky bar and a light gas gun. Dynamic damage visualization will be achieved using high-speed X-ray phase contract imaging and high-speed X-ray diffraction. Temperature field will be measured with a new 2D topographical temperature measurement method using the laser-induced phosphorescence of embedded or coated particles providing continuous temperature measurements. To examine the effects of materials and microstructures, the specimen materials will be varied from brittle to ductile, including both homogeneous and inhomogeneous materials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2018
- Source ID
- W911NF1710241
Entities
People
- Weinong Chen
Organizations
- Army Contracting Command
- United States Army
- University of Virginia