Nonlinear ultrasonic methods for nondestructive damage assessment in structural materials (Conference Presentation)

2018 ◽  
Author(s):  
Jianmin Qu
Keyword(s):  
Damage Assessment ◽  
Structural Materials ◽  
Ultrasonic Methods ◽  
Nonlinear Ultrasonic

Monitoring of the Damage in Stone Blocks by Means of Non-Destructive Methods

2013 ◽  
Vol 592-593 ◽  
pp. 545-548 ◽  
Author(s):  
Marta Kořenská ◽  
Monika Manychova ◽  
Lubos Pazdera ◽  
Libor Topolář
Keyword(s):  
Damage Assessment ◽  
Ultrasonic Method ◽  
Low Frequency ◽  
Material Structure ◽  
Ultrasonic Spectroscopy ◽  
Impact Echo ◽  
Spectral Changes ◽  
Nonlinear Ultrasonic ◽  
The Impact ◽  
Impact Echo Method

This paper deals with the damage assessment in stone blocks dismantled from a historic bridge construction. Nonlinear ultrasonic spectroscopy and impact echo methods were used for evaluating the stone block integrity structure. Harmonic analysis of the sample response on well defined ultrasonic excitation was used in the case of nonlinear ultrasonic method application. The amplitude dependent spectral changes of the probing signals were measured in the damaged blocks. Measurement results showed that the analysis of amplitude dependent spectral changes is a promising method for the damage assessment in structures. The Impact-Echo method is a technique for detecting defects in material structure such as stone blocks. It is based on monitoring the propagation of elastic waves from a short-duration mechanical impact. The aim of this paper is to provide an overview of the technique and to discuss the important parameters involved in this type of testing. The impact echo method is used to generate low-frequency stress waves from 500 Hz to 50 kHz that propagate into the structure and are reflected by defects and external surfaces.

Monitoring Concrete Curing by Linear and Nonlinear Ultrasonic Methods

2021 ◽  
Vol 118 (3) ◽  
Author(s):  
Hamad N. Alnuaimi ◽  
Saptarshi Sasmal ◽  
Umar Amjad ◽  
Arash Nikvar-Hassani ◽  
Lianyang Zhang ◽  
...  
Keyword(s):  
Ultrasonic Methods ◽  
Nonlinear Ultrasonic ◽  
Linear And Nonlinear

Multi-level damage detection with nonlinear ultrasonic methods

2013 ◽  
Author(s):  
Kathryn H. Matlack ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Jianmin Qu
Keyword(s):  
Damage Detection ◽  
Ultrasonic Methods ◽  
Nonlinear Ultrasonic ◽  
Multi Level

scholarly journals Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

2017 ◽  
Vol 404 ◽  
pp. 102-115 ◽  
Author(s):  
Gian Piero Malfense Fierro ◽  
Danielle Calla' ◽  
Dmitri Ginzburg ◽  
Francesco Ciampa ◽  
Michele Meo
Keyword(s):  
Damage Assessment ◽  
Nonlinear Ultrasonic

Nonlinear ultrasonic imaging of damage in composite materials using a higher harmonic and modulated multi-path reciprocal method

2020 ◽  
pp. 147592172097702
Author(s):  
Salvatore Boccardi ◽  
Gian Piero Malfense Fierro ◽  
Michele Meo
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Statistical Approach ◽  
Reciprocal Relationship ◽  
Structural Health ◽  
Sparse Array ◽  
Ultrasonic Methods ◽  
Nonlinear Ultrasonic ◽  
Higher Harmonic ◽  
Nonlinear Elastic

Structural health monitoring has become an important factor in the assessment of defects/damage in material components. Ultrasonic methods generally incorporate a sparse array of sensors/transducers as they provide a low number of piezoelectric sensors per area, thus providing savings with regard to system costs and weight. Many structural health monitoring techniques rely on linear ultrasonic effects such as reflections, amplitude changes, time of arrival and wave scattering effects which rely on precise baseline measurements. In this work, a nonlinear ultrasonic method based on a sparse array of surface-bonded ultrasonic transducers was used to evaluate the second harmonic and modulated elastic responses from a damaged medium. A complex composite stiffened panel with barely visible impact damage was evaluated. The points closest to damage are found on the paths between transmitter–receiver pairs through a reciprocal relationship of nonlinear elastic parameters and a statistical approach was used to select a cloud of points so that a two-dimensional image of the damaged region is created. Experimental results revealed that the second-order nonlinear parameter provided accurate damage localisation and imaging and the use of modulation bands further improved imaging accuracy and damage localisation. The maximum error between the calculated and the real damage area centres was only 1.3 mm. The proposed nonlinear elastic multi-path imaging technique based on higher harmonic generation and modulation coupled with a statistical approach provides damage detection without a priori knowledge of the material characteristics, which is in direct contrast to conventional linear ultrasonic methods which rely on precise measurement of elastic wave effects both before and after the initiation of damage.

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