Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics

G De Angelis, Michele Meo, Darryl P Almond, Simon G Pickering, Umberto Polimeno

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

There has been a growing interest in the use of composites especially in structural application ranging from aerospace to automotive and marine sectors. However, their performances under impact loading represent one of the major concerns as impacts may occur during manufacture, normal operations and maintenance. This paper presents two novel NDT techniques, thermosonics and digital shearography (DISH) to detect and assess barely visible impact damage (BVID) produced on a stiffened composite wing panel by unknown low energy impacts. Thermosonics is based on synchronized infrared imaging and ultrasonic excitation. Despite the apparent simplicity of the experimental setup, thermosonics involves a number of factors, e.g. acoustic horn location, horn crack proximity, horn-sample coupling etc., that significantly tend to influence both the degree and the period of the excitation. Then, a numerical- experimental procedure for the assessment of the size and depth of delamination by digital shearography (DISH) is proposed. The flaw detection capabilities of DISH have been evaluated by measuring the dynamic response of the delaminated area to applied stresses. The shearographic methodology is based on the recognition of the (0 1) resonance mode per defect. A simplified model of thin circular plate, idealized above each impacted area, is used to calculate the natural frequency of vibrating delamination. The numerical difference between experimental resonance frequencies and those computationally obtained is minimized using an unconstrained optimization algorithm in order to calculate the delamination depth. The results showed that thermosonics is a quick and effective method to detect and localize BVID damage while the combined shearography and optimization methodology was able to size and localize delamination due to low velocity impacts.
Original languageEnglish
Title of host publicationComposite Science and Technology
Place of PublicationZurich-Durnten
PublisherTrans Tech Publications
Pages904-909
Number of pages6
Volume471-472
ISBN (Print)10139826
DOIs
Publication statusPublished - 2011
Event8th International Conference on Composite Science and Technology, ICCST8, March 22, 2011 - March 24, 2011 - Kuala Lumpur, Malaysia
Duration: 1 Jan 2011 → …

Publication series

NameKey Engineering Materials
PublisherTrans Tech Publications

Conference

Conference8th International Conference on Composite Science and Technology, ICCST8, March 22, 2011 - March 24, 2011
CountryMalaysia
CityKuala Lumpur
Period1/01/11 → …

Fingerprint

Damage detection
Delamination
Composite materials
Defects
Infrared imaging
Nondestructive examination
Dynamic response
Natural frequencies
Ultrasonics
Acoustics
Cracks

Cite this

De Angelis, G., Meo, M., Almond, D. P., Pickering, S. G., & Polimeno, U. (2011). Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics. In Composite Science and Technology (Vol. 471-472, pp. 904-909). (Key Engineering Materials). Zurich-Durnten: Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/KEM.471-472.904

Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics. / De Angelis, G; Meo, Michele; Almond, Darryl P; Pickering, Simon G; Polimeno, Umberto.

Composite Science and Technology. Vol. 471-472 Zurich-Durnten : Trans Tech Publications, 2011. p. 904-909 (Key Engineering Materials).

Research output: Chapter in Book/Report/Conference proceedingChapter

De Angelis, G, Meo, M, Almond, DP, Pickering, SG & Polimeno, U 2011, Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics. in Composite Science and Technology. vol. 471-472, Key Engineering Materials, Trans Tech Publications, Zurich-Durnten, pp. 904-909, 8th International Conference on Composite Science and Technology, ICCST8, March 22, 2011 - March 24, 2011, Kuala Lumpur, Malaysia, 1/01/11. https://doi.org/10.4028/www.scientific.net/KEM.471-472.904
De Angelis G, Meo M, Almond DP, Pickering SG, Polimeno U. Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics. In Composite Science and Technology. Vol. 471-472. Zurich-Durnten: Trans Tech Publications. 2011. p. 904-909. (Key Engineering Materials). https://doi.org/10.4028/www.scientific.net/KEM.471-472.904
De Angelis, G ; Meo, Michele ; Almond, Darryl P ; Pickering, Simon G ; Polimeno, Umberto. / Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics. Composite Science and Technology. Vol. 471-472 Zurich-Durnten : Trans Tech Publications, 2011. pp. 904-909 (Key Engineering Materials).
@inbook{f6af245b6a6b4f78869527bf18944252,
title = "Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics",
abstract = "There has been a growing interest in the use of composites especially in structural application ranging from aerospace to automotive and marine sectors. However, their performances under impact loading represent one of the major concerns as impacts may occur during manufacture, normal operations and maintenance. This paper presents two novel NDT techniques, thermosonics and digital shearography (DISH) to detect and assess barely visible impact damage (BVID) produced on a stiffened composite wing panel by unknown low energy impacts. Thermosonics is based on synchronized infrared imaging and ultrasonic excitation. Despite the apparent simplicity of the experimental setup, thermosonics involves a number of factors, e.g. acoustic horn location, horn crack proximity, horn-sample coupling etc., that significantly tend to influence both the degree and the period of the excitation. Then, a numerical- experimental procedure for the assessment of the size and depth of delamination by digital shearography (DISH) is proposed. The flaw detection capabilities of DISH have been evaluated by measuring the dynamic response of the delaminated area to applied stresses. The shearographic methodology is based on the recognition of the (0 1) resonance mode per defect. A simplified model of thin circular plate, idealized above each impacted area, is used to calculate the natural frequency of vibrating delamination. The numerical difference between experimental resonance frequencies and those computationally obtained is minimized using an unconstrained optimization algorithm in order to calculate the delamination depth. The results showed that thermosonics is a quick and effective method to detect and localize BVID damage while the combined shearography and optimization methodology was able to size and localize delamination due to low velocity impacts.",
author = "{De Angelis}, G and Michele Meo and Almond, {Darryl P} and Pickering, {Simon G} and Umberto Polimeno",
year = "2011",
doi = "10.4028/www.scientific.net/KEM.471-472.904",
language = "English",
isbn = "10139826",
volume = "471-472",
series = "Key Engineering Materials",
publisher = "Trans Tech Publications",
pages = "904--909",
booktitle = "Composite Science and Technology",
address = "Germany",

}

TY - CHAP

T1 - Impact damage detection in a stiffened composite wing panel using digital shearography and thermosonics

AU - De Angelis, G

AU - Meo, Michele

AU - Almond, Darryl P

AU - Pickering, Simon G

AU - Polimeno, Umberto

PY - 2011

Y1 - 2011

N2 - There has been a growing interest in the use of composites especially in structural application ranging from aerospace to automotive and marine sectors. However, their performances under impact loading represent one of the major concerns as impacts may occur during manufacture, normal operations and maintenance. This paper presents two novel NDT techniques, thermosonics and digital shearography (DISH) to detect and assess barely visible impact damage (BVID) produced on a stiffened composite wing panel by unknown low energy impacts. Thermosonics is based on synchronized infrared imaging and ultrasonic excitation. Despite the apparent simplicity of the experimental setup, thermosonics involves a number of factors, e.g. acoustic horn location, horn crack proximity, horn-sample coupling etc., that significantly tend to influence both the degree and the period of the excitation. Then, a numerical- experimental procedure for the assessment of the size and depth of delamination by digital shearography (DISH) is proposed. The flaw detection capabilities of DISH have been evaluated by measuring the dynamic response of the delaminated area to applied stresses. The shearographic methodology is based on the recognition of the (0 1) resonance mode per defect. A simplified model of thin circular plate, idealized above each impacted area, is used to calculate the natural frequency of vibrating delamination. The numerical difference between experimental resonance frequencies and those computationally obtained is minimized using an unconstrained optimization algorithm in order to calculate the delamination depth. The results showed that thermosonics is a quick and effective method to detect and localize BVID damage while the combined shearography and optimization methodology was able to size and localize delamination due to low velocity impacts.

AB - There has been a growing interest in the use of composites especially in structural application ranging from aerospace to automotive and marine sectors. However, their performances under impact loading represent one of the major concerns as impacts may occur during manufacture, normal operations and maintenance. This paper presents two novel NDT techniques, thermosonics and digital shearography (DISH) to detect and assess barely visible impact damage (BVID) produced on a stiffened composite wing panel by unknown low energy impacts. Thermosonics is based on synchronized infrared imaging and ultrasonic excitation. Despite the apparent simplicity of the experimental setup, thermosonics involves a number of factors, e.g. acoustic horn location, horn crack proximity, horn-sample coupling etc., that significantly tend to influence both the degree and the period of the excitation. Then, a numerical- experimental procedure for the assessment of the size and depth of delamination by digital shearography (DISH) is proposed. The flaw detection capabilities of DISH have been evaluated by measuring the dynamic response of the delaminated area to applied stresses. The shearographic methodology is based on the recognition of the (0 1) resonance mode per defect. A simplified model of thin circular plate, idealized above each impacted area, is used to calculate the natural frequency of vibrating delamination. The numerical difference between experimental resonance frequencies and those computationally obtained is minimized using an unconstrained optimization algorithm in order to calculate the delamination depth. The results showed that thermosonics is a quick and effective method to detect and localize BVID damage while the combined shearography and optimization methodology was able to size and localize delamination due to low velocity impacts.

UR - http://dx.doi.org/10.4028/www.scientific.net/KEM.471-472.904

U2 - 10.4028/www.scientific.net/KEM.471-472.904

DO - 10.4028/www.scientific.net/KEM.471-472.904

M3 - Chapter

SN - 10139826

VL - 471-472

T3 - Key Engineering Materials

SP - 904

EP - 909

BT - Composite Science and Technology

PB - Trans Tech Publications

CY - Zurich-Durnten

ER -