Use of diffuse approximation on DIC for early damage detection in 3D carbon/epoxy composites

2013 ◽  
Vol 88 ◽  
pp. 16-25 ◽  
Author(s):  
Pierre Feissel ◽  
Julien Schneider ◽  
Zoheir Aboura ◽  
Pierre Villon
Keyword(s):  
Damage Detection ◽  
Epoxy Composites ◽  
Diffuse Approximation ◽  
Early Damage

APPLICATION OF THE EARLY DAMAGE DIAGNOSTICS TECHNIQUE TO EXAMINATION OF THE AVIATION PANEL

2019 ◽  
Vol 85 (6) ◽  
pp. 53-63 ◽  
Author(s):  
I. E. Vasil’ev ◽  
Yu. G. Matvienko ◽  
A. V. Pankov ◽  
A. G. Kalinin
Keyword(s):  
Acoustic Emission ◽  
Damage Detection ◽  
High Speed ◽  
Early Stage ◽  
Video Data ◽  
High Speed Video ◽  
Damage Diagnostics ◽  
Subsurface Defect ◽  
Sensitive Coating ◽  
Early Damage

The results of using early damage diagnostics technique (developed in the Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN) for detecting the latent damage of an aviation panel made of composite material upon bench tensile tests are presented. We have assessed the capabilities of the developed technique and software regarding damage detection at the early stage of panel loading in conditions of elastic strain of the material using brittle strain-sensitive coating and simultaneous crack detection in the coating with a high-speed video camera “Video-print” and acoustic emission system “A-Line 32D.” When revealing a subsurface defect (a notch of the middle stringer) of the aviation panel, the general concept of damage detection at the early stage of loading in conditions of elastic behavior of the material was also tested in the course of the experiment, as well as the software specially developed for cluster analysis and classification of detected location pulses along with the equipment and software for simultaneous recording of video data flows and arrays of acoustic emission (AE) data. Synchronous recording of video images and AE pulses ensured precise control of the cracking process in the brittle strain-sensitive coating (tensocoating)at all stages of the experiment, whereas the use of structural-phenomenological approach kept track of the main trends in damage accumulation at different structural levels and identify the sources of their origin when classifying recorded AE data arrays. The combined use of oxide tensocoatings and high-speed video recording synchronized with the AE control system, provide the possibility of definite determination of the subsurface defect, reveal the maximum principal strains in the area of crack formation, quantify them and identify the main sources of AE signals upon monitoring the state of the aviation panel under loading P = 90 kN, which is about 12% of the critical load.

scholarly journals Device Concept for the Generation of Guided Waves for Early Damage Detection

2012 ◽  
Vol 47 ◽  
pp. 1185-1188 ◽  
Author(s):  
E. Köppe ◽  
M. Bartholmai ◽  
J. Prager
Keyword(s):  
Damage Detection ◽  
Guided Waves ◽  
Early Damage

Nonlinear Ultrasonic NDE for Early Damage Detection in Nickel Alloys

2018 ◽  
Author(s):  
Matthew Webster ◽  
Kevin Farinholt ◽  
Fritz Friedersdorf ◽  
Marc Pepi ◽  
Anindya Ghoshal
Keyword(s):  
Damage Detection ◽  
Nickel Alloys ◽  
Nonlinear Ultrasonic ◽  
Ultrasonic Nde ◽  
Early Damage

Factors Influencing Acousto-Ultrasonic Approach to Impact Damage in Composite Materials

2011 ◽  
Vol 393-395 ◽  
pp. 97-101
Author(s):  
Huan Ping Kong ◽  
Zheng Zhang ◽  
Li Fei Li
Keyword(s):  
Composite Materials ◽  
Damage Detection ◽  
Rapid Detection ◽  
Impact Damage ◽  
Low Frequency ◽  
Factors Influencing ◽  
Frequency Transducer ◽  
Ultrasonic Parameters ◽  
Early Damage

This paper studied factors influencing AU detection results on different damage specimens, including simulation frequency, transducer modes and transducer location. Correlation between acousto-ultrasonic parameters (AUP1, AUP2) and impact damage severity in composite was investigated. The results showed that as damage severity increased, AUP1 and AUP2 of three different transducers decreased. Applying low frequency transducer, the variation of AUP1 may indicate a more rapid detection prospect. In addition, applying S1-transducer and WD-transducer, AUP2 was more effective for the early damage detection. Varying transducer’s location, S1-transducer applying 500khz simulation frequency presented a valuable results.

Efficient Test Bench Operation with Early Damage Detection Systems

2019 ◽  
Author(s):  
Thomas Laible ◽  
Stefan Pischinger ◽  
Matthias Pouch ◽  
Carsten Küpper
Keyword(s):  
Damage Detection ◽  
Test Bench ◽  
Detection Systems ◽  
Efficient Test ◽  
Early Damage

Early damage detection of epoxy via poly(vinyl cinnamate) mechanophore using Fourier transform infrared spectroscopy

2017 ◽  
Vol 4 (7) ◽  
pp. 075014
Author(s):  
Ryan Gunckel ◽  
Elizabeth Nofen ◽  
Joshua Hansen-Staggs ◽  
Shelby Babcock ◽  
Bonsung Koo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Damage Detection ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Vinyl Cinnamate ◽  
Early Damage
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