Download or read book Research on Exploratory Development of Nondestructive Methods for Crack Detection written by Rudi Schroeer and published by . This book was released on 1968 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a research study devoted to exploratory development of a nondestructive method for crack detection are reported in this document, covering the period from June 1967 to July 1968. The method investigated is based upon an acoustic impact technique, which consists of the analysis of the vibrations in the test specimens produced by mechanical pulses. Frequency shifts and damping times were the primary factors evaluated. Some theoretical concepts are discussed in this report.