Accession Number:

ADA592196

Title:

Understanding of Materials State and its Degradation using Non-Linear Ultrasound (NLU) Approaches - Phase 3

Descriptive Note:

Final rept. 7 Mar 2012-7 Feb 2013

Corporate Author:

INDIAN INST OF TECH MADRAS DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2013-05-31

Pagination or Media Count:

39.0

Abstract:

This Phase III research proposal was a continuation effort on the Phase I and II work. The overall program focuses on the development of new explorations towards the development of better understanding of non-linear ultrasonic methods for the quantitative materials state evaluation and characterization of damage in metallic alloys. Both theoretical and experimental works were carried out in order to understand the significance of the effects of microscopic damage in metals using the measurements of Non-Linear Effects of Ultrasound NLU. The Phase III work effort extended the Finite Difference in Time Domain FDTD and the mass-spring lattice models MSLM to a 2D MSLM with NLU parameters while resolving some of the issues that were observed in Phase II. The experimental results were performed on copper alloys that have damage behavior that can be explained using literature data. The improved understanding of NLU is anticipated to lead to new measurement techniques that have applications in the area of vehicle health monitoring, nondestructive testing, and process monitoring of manufacturing processes.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE