Vibro-acoustic modulation baseline-free non-destructive testing

نویسندگان

چکیده

Vibro-Acoustic Modulation method for detection and characterization of various structural material flaws has been actively researched the last two decades. Most studies focused on monitoring macro-cracks requiring well established baseline (no-damage) value modulation index. The is specific a particular structure, measuring setup, other factors can't be in many practical situations without long term looking relative change Index. In this work, we propose investigate baseline-free method, which does not require Index change, unlike conventional approach. It was hypothesized that nonlinear mechanisms (and respective response) structure are different undamaged damaged material. For example: damage or at early stages fatigue have classic elastic hysteretic/dissipative nonlinearity while (cracked) may exhibit contact bi-linear Hertzian mechanisms. These yield power law dependencies (MI) as function applied vibration frequency input amplitude, B: MI ~ B^b Thus, quadratic yields linear dependence, b =1, results b<1. Other laws. Therefore, coefficient instead offer testing reference value. also some insights into transformation during evolution. This approach experimentally investigated validated.

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ژورنال

عنوان ژورنال: Journal of Sound and Vibration

سال: 2021

ISSN: ['1095-8568', '0022-460X']

DOI: https://doi.org/10.1016/j.jsv.2020.115808