An Insight into High-order Harmonic Generation of Lamb Waves Induced by a Breathing Crack Using a Spring Model and a Local Interaction Simulation Approach

2015 ◽  
Author(s):  
RAFAL RADECKI ◽  
ZHONGQING SU ◽  
LI CHENG
Keyword(s):  
Harmonic Generation ◽  
Lamb Waves ◽  
Local Interaction ◽  
Spring Model ◽  
Simulation Approach ◽  
Breathing Crack ◽  
High Order Harmonic Generation ◽  
High Order Harmonic ◽  
Interaction Simulation ◽  
Insight Into

Modeling Guided Waves for Damage Identification in Isotropic and Orthotropic Plates Using a Local Interaction Simulation Approach

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Shankar Sundararaman ◽  
Douglas E. Adams
Keyword(s):  
Lamb Waves ◽  
Wave Length ◽  
Local Interaction ◽  
Wave Form ◽  
Multiple Site ◽  
Simulation Approach ◽  
Orthotropic Plates ◽  
Sharp Interface Model ◽  
Multiple Site Damage ◽  
Interaction Simulation

In this paper, a numerical simulation technique based on the local interaction simulation approach (LISA)/sharp interface model (SIM) is used to study the propagation of Lamb waves in aluminum and orthotropic plates and wave interactions with damage. The LISA/SIM model allows for accurate and fast simulations of sharp changes in material properties across interfaces associated with damage or specimen boundaries. Damage in the form of holes and changes in density and/or stiffnesses are studied for three different plates. These local changes in density and stiffness have dimensions not exceeding the wave length of the interrogating wave form. Wave scatter from these damage sites is shown at different time instants and at specific spatial locations. Multiple site damage cases are studied for all the plate structures. The different scatter patterns associated with intersecting and nonintersecting surface cracks are also studied. Results obtained from a combination of single site damage cases are compared with the composite multiple site damage case to study the usability of commonly applied algorithms for identifying damage. The benefits of observing multiple directions of the displacement field are demonstrated. It is shown that the out-of-plane measurements give a clearer indication of damage sites than the in-plane measurements.

Relativistic high-order harmonic generation

2003 ◽  
Vol 50 (3-4) ◽  
pp. 375-386
Author(s):  
D. B. MilosÕeviĆ ◽  
W. Becker
Keyword(s):  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic
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