Systems and methods for nonlinear ultrasonic evaluation of material properties

A system for non-destructively evaluating at least one material property of a structure, comprising:

• a probe assembly, the probe assembly including:
• a frame;
• a bracket coupled to the frame;
• a first transducer coupled to the bracket and configured to be disposed on a surface of a structure;
• a second transducer coupled to the bracket and configured to be disposed on the surface of the structure;
• a forcing mechanism coupled to the frame and to the bracket, the forcing mechanism configured to apply a force to the bracket;
• a controller configured to be coupled to the probe assembly such that a processor of the controller is in signal communication with the first transducer and the second transducer, the processor configured to:
• cause the first transducer to generate a surface wave in the structure when the first transducer is disposed on the surface of the structure;
• extract at least one signal feature from the surface wave signal received by the second transducer;
• and
• determine at least one material property of the structure based on the at least one signal feature extracted from the surface wave signal.