Detection of Damage Precursors in Steel Components for Life-Cycle Assessments
-
2019-10-01
Details:
-
Creators:
-
Corporate Creators:
-
Contributors:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Submission October, 2019
-
Contracting Officer:
-
Corporate Publisher:
-
Abstract:The early identification of damage of fracture-critical members is of the outmost importance in the maintenance of a safe bridge infrastructure. A new Non-Destructive Evaluation method that gives an early warning of accumulating damage is been formulated herein. The Vibro-Acoustic Modulation method utilizes nonlinear interactions of a high frequency ultrasonic wave with a low frequency modulating vibration in the presence of various flaws such as fatigue and stress-corrosion cracks. The growth of a flaw in time is correlated with with an increase in a parameter called the Modulation Index which is defined in the spectral domain as the ratio of the side-band spectral components formed at frequencies around the amplitude of the carrier. The new method is shown capable of detecting damage in simple during cyclic loading. An experimental set-up has been fabricated that can be taken to the field for farther developments of the new NDE method.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: