1. Nonlinear ultrasonic measurements for the characterization of fracture toughness in steel alloys Open Access Author: Williams, Colin Title: Nonlinear ultrasonic measurements for the characterization of fracture toughness in steel alloys Area of Honors: Engineering Science Keywords: UltrasoundFracture ToughnessNondestructive EvaluationMaterial Characterization File: Download Williams_Signature_Page.pdfDownload Williams_Thesis_FINAL.pdf Thesis Supervisors: Parisa Shokouhi, Thesis SupervisorAndrea P. Arguelles, Thesis Honors Advisor