Abstract
This work proposes a nonlinear dual frequency (modulated) phased array technique for fatigue crack evaluation in aluminium and metallic structures, and near field enhancement in composite materials. A standard ultrasound system with multiple transmitting and receiving elements was used to excite an aluminium fatigue sample and impacted composite plate with two frequencies. The method relied on the evaluation of harmonic sidebands which can be correlated to defects/damage in materials, with nonlinear methods having shown increased sensitivity versus standard techniques. An initial pump frequency (f2) is used to initialize a - breathing/ringing' crack after which a second frequency (f1) is used to further excite the cracked region and generate sidebands from the modulated frequencies. This method relies on both an amplitude and frequency subtraction techniques to filter out linear ultrasound effects. One of the benefits of modulation techniques in general are reduction of equipment based nonlinearities, commonly produced when conducting single frequency tests. An aluminium coupon with a closed fatigue crack was evaluated using single and dual frequency methods. The results showed that the dual frequency excitation method was able to more accurately define the extent of the crack and improved accuracy versus standard phased array techniques.
| Original language | English |
|---|---|
| Title of host publication | Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII |
| Editors | H. Felix Wu, Andrew L. Gyekenyesi, Tzu-Yang Yu, Peter J. Shull |
| Publisher | SPIE |
| ISBN (Electronic) | 9781510625976 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
| Event | Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII 2019 - Denver, USA United States Duration: 4 Mar 2019 → 7 Mar 2019 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 10971 |
| ISSN (Print) | 0277-786X |
| ISSN (Electronic) | 1996-756X |
Conference
| Conference | Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII 2019 |
|---|---|
| Country | USA United States |
| City | Denver |
| Period | 4/03/19 → 7/03/19 |
Keywords
- BVID
- Composite
- Damage
- Defects
- Fatigue
- Modulation
- Nonlinear Imaging
- Nonlinear Ultrasound
- Phased Array
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Nonlinear phased array imaging of flaws a modulation technique. / Malfense Fierro, Gian Piero; Meo, Michele.
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII. ed. / H. Felix Wu; Andrew L. Gyekenyesi; Tzu-Yang Yu; Peter J. Shull. SPIE, 2019. 1097116 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10971).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Nonlinear phased array imaging of flaws a modulation technique
AU - Malfense Fierro, Gian Piero
AU - Meo, Michele
PY - 2019/1/1
Y1 - 2019/1/1
N2 - This work proposes a nonlinear dual frequency (modulated) phased array technique for fatigue crack evaluation in aluminium and metallic structures, and near field enhancement in composite materials. A standard ultrasound system with multiple transmitting and receiving elements was used to excite an aluminium fatigue sample and impacted composite plate with two frequencies. The method relied on the evaluation of harmonic sidebands which can be correlated to defects/damage in materials, with nonlinear methods having shown increased sensitivity versus standard techniques. An initial pump frequency (f2) is used to initialize a - breathing/ringing' crack after which a second frequency (f1) is used to further excite the cracked region and generate sidebands from the modulated frequencies. This method relies on both an amplitude and frequency subtraction techniques to filter out linear ultrasound effects. One of the benefits of modulation techniques in general are reduction of equipment based nonlinearities, commonly produced when conducting single frequency tests. An aluminium coupon with a closed fatigue crack was evaluated using single and dual frequency methods. The results showed that the dual frequency excitation method was able to more accurately define the extent of the crack and improved accuracy versus standard phased array techniques.
AB - This work proposes a nonlinear dual frequency (modulated) phased array technique for fatigue crack evaluation in aluminium and metallic structures, and near field enhancement in composite materials. A standard ultrasound system with multiple transmitting and receiving elements was used to excite an aluminium fatigue sample and impacted composite plate with two frequencies. The method relied on the evaluation of harmonic sidebands which can be correlated to defects/damage in materials, with nonlinear methods having shown increased sensitivity versus standard techniques. An initial pump frequency (f2) is used to initialize a - breathing/ringing' crack after which a second frequency (f1) is used to further excite the cracked region and generate sidebands from the modulated frequencies. This method relies on both an amplitude and frequency subtraction techniques to filter out linear ultrasound effects. One of the benefits of modulation techniques in general are reduction of equipment based nonlinearities, commonly produced when conducting single frequency tests. An aluminium coupon with a closed fatigue crack was evaluated using single and dual frequency methods. The results showed that the dual frequency excitation method was able to more accurately define the extent of the crack and improved accuracy versus standard phased array techniques.
KW - BVID
KW - Composite
KW - Damage
KW - Defects
KW - Fatigue
KW - Modulation
KW - Nonlinear Imaging
KW - Nonlinear Ultrasound
KW - Phased Array
UR - http://www.scopus.com/inward/record.url?scp=85069789838&partnerID=8YFLogxK
U2 - 10.1117/12.2514962
DO - 10.1117/12.2514962
M3 - Conference contribution
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII
A2 - Wu, H. Felix
A2 - Gyekenyesi, Andrew L.
A2 - Yu, Tzu-Yang
A2 - Shull, Peter J.
PB - SPIE
ER -