Drexel University

Damage evolution under extreme strain-rates

The Lamberson Research Group uses MatchID with ultra high-speed imaging to map material behavior under complex, dynamic loading scenarios. The team examines systems such as nanolayered MAX phases (metal-ceramic hybrids),ferroelectric ceramics, and hard metal tungsten carbides, to characterize damage evolution under moderate to extreme strain-rates. The group has specific expertise in extracting dynamic fatigue and fracture properties including anisotropic mixed-mode crack tip energetics from the resulting impact-driven displacement fields.

One of the main challenges is the tradeoff between spatial and temporal resolution, a fundamental limitation of the cameras, with respect to the failure processes of interest. MatchID ’s subpixel algorithms delivered an improvement in capturing a growing crack front, with higher order shape functions that minimize systematic errors, and reduce overall noise when dealing with colliding objects. In addition, using the performance analysis tool built directly into the software, the ideal parameters such as virtual strain gauge size are easy to determine, allowing us to optimize the data retrieved from limited pixels, while minimizing the amount of computing done in the process. These features, unique to MatchID, have ultimately saved us time and increased the quality of our results.

Location

Dynamic Multifunctional Materials Lab,
Drexel University,
Philadelphia PA,
USA
www.dynamic-lamberson.com