Ultrasonic characterization of delamination in aeronautical composites using noncontact laser generation and detection

Guangkai Sun; Zhenggan Zhou; Xiucheng Chen; Jie Wang

doi:10.1364/AO.52.006481

Applied Optics
Vol. 52,
Issue 26,
pp. 6481-6486
(2013)
•https://doi.org/10.1364/AO.52.006481

Ultrasonic characterization of delamination in aeronautical composites using noncontact laser generation and detection

Guangkai Sun, Zhenggan Zhou, Xiucheng Chen, and Jie Wang

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Guangkai Sun, Zhenggan Zhou, Xiucheng Chen, and Jie Wang, "Ultrasonic characterization of delamination in aeronautical composites using noncontact laser generation and detection," Appl. Opt. 52, 6481-6486 (2013)

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Abstract

The characterization of delamination in composite plates with ultrasonic waves generated and detected by lasers is presented. Composite materials have become one of the most important structural materials in the aviation industry because of their excellent mechanical properties, such as high specific stiffness and antifatigue. This paper reports a new application of the laser ultrasonic technique to perform nondestructive detection of carbon-fiber-reinforced plastic (CFRP) and continuous-fiber-reinforced ceramic matrix composites (CFCCs) containing artificial internal defects, based on propagation characteristic of ultrasonic waves generated by pulse laser with a wavelength of 1064 nm and pulse duration of 10 ns. A laser interferometer based on two-wave mixing is used to measure ultrasonic wave signals. The main advantage of this technique over conventional ultrasonic testing techniques is the ability to carry out detection without using coupling agents. The research results prove that the laser ultrasonic technique is effective for the detection of internal defects in both CFRP and CFCC composite components, which should promote and expand the application of the technique in the aviation industry.

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Material Type	$ρ (kg / m^{3})$	$E_{11} (GPa)$	$E_{22} (GPa)$	$E_{33} (GPa)$	$G_{12} (GPa)$	$G_{13} (GPa)$	$G_{23} (GPa)$	$υ_{12}$	$υ_{13}$	$υ_{23}$
CFRP	1550	150	10	10	4.9	4.9	3.2	0.33	0.33	0.44
CFCC	2100	135	135	180	25	25	35	0.32	0.32	0.22

Material Type	$c (J / {kgK}^{- 1})$	$λ (W / {mK}^{- 1})$	$α_{1} (K^{- 1})$	$α_{2} (K^{- 1})$	$α_{3} (K^{- 1})$
CFRP	981	0.75	$1 \times 10^{- 7}$	$2.5 \times 10^{- 5}$	$2.5 \times 10^{- 5}$
CFCC	620	19	$3 \times 10^{- 6}$	$3 \times 10^{- 6}$	$5 \times 10^{- 6}$

Material Type	$ρ (kg / m^{3})$	$E_{11} (GPa)$	$E_{22} (GPa)$	$E_{33} (GPa)$	$G_{12} (GPa)$	$G_{13} (GPa)$	$G_{23} (GPa)$	$υ_{12}$	$υ_{13}$	$υ_{23}$
CFRP	1550	150	10	10	4.9	4.9	3.2	0.33	0.33	0.44
CFCC	2100	135	135	180	25	25	35	0.32	0.32	0.22

Material Type	$c (J / {kgK}^{- 1})$	$λ (W / {mK}^{- 1})$	$α_{1} (K^{- 1})$	$α_{2} (K^{- 1})$	$α_{3} (K^{- 1})$
CFRP	981	0.75	$1 \times 10^{- 7}$	$2.5 \times 10^{- 5}$	$2.5 \times 10^{- 5}$
CFCC	620	19	$3 \times 10^{- 6}$	$3 \times 10^{- 6}$	$5 \times 10^{- 6}$

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Applied Optics