Case Study of Model-Based Inversion of the Angle Beam Ultrasonic Response From Composite Impact Damage
Abstract
The U.S. Air Force seeks to improve lifecycle management of composite structures. Nondestructive characterization of damage is a key input to this framework. One approach to characterization is model-based inversion of ultrasound inspection data; however, the computational expense of simulating the response from damage represents a major hurdle for practicality. A surrogate forward model with greater computational efficiency and sufficient accuracy is, therefore, critical to enable damage characterization via model-based inversion. In this work, a surrogate model based on Gaussian process regression (GPR) is developed on the chirplet decomposition of the simulated quasi-shear scatter from delamination-like features that form a shadowed region within a representative composite layup. The surrogate model is called in the solution of the inverse problem for the position of the hidden delamination, which is achieved with <0.5% error in <20 min on a workstation computer for two unique test cases. These results demonstrate that solving the inverse problem from the ultrasonic response is tractable for composite impact damage with hidden delaminations.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 05, 2018
- Source ID
- 10.1115/1.4040233
Entities
People
- Daniel Sparkman
- John C. Aldrin
- John Welter
- John Wertz
- Laura Homa
Organizations
- Air Force Research Laboratory
- University of Dayton Research Institute