Characterization of CFRP Laminates’ layups using through-Transmitting ultrasound waves

Hsu, David K.; Im, Kwang Hee; Cho, Young Tae; Park, Jae Woung; Sim, Jae Young; Yang, In Young

doi:10.1007/bf03185226

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…5 Ultrasound has been used by multiple researchers for laminated composites. For example, Hsu et al 6 used a vector decomposition method whereby an image of a correctly fabricated part was aligned against an unknown part, and they were able to identify the ply misorientation and layup symmetry. Although, the results were unclear when the laminate was not symmetric such as that shown in reference 4.…”

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confidence: 99%

A statistical approach for failure analysis involving uncertainty in determining ply orientation

Rahul,

Jack,

Smith

2024

Polymer Composites

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This article presents the uncertainty of the part performance due to the estimated ply orientations of a carbon fiber laminate inspected using ultrasound inspection. Recent developments to quantify the orientation using ultrasound inspection is accurate to within for each lamina. The research presented in the current work statistically analyzes the impact this uncertainty in measurement has on the resulting expected failure envelope using two different analytical methods: (1) Monte‐Carlo (MC) simulation approach extending classical laminate theory and (2) Closed form approach of Mean Value First Order Second Moment method based on derivatives of failure envelope as a function of lamina orientation. The results are validated against a commercial finite element‐based MC simulation approach. The Tsai‐Wu failure criteria is implemented to determine the first ply failure stresses by applying a variety of planer loads to form the failure envelope for a given layup sequence of a carbon fiber reinforced polymer laminate. In this article, using stochastic simulations, the failure envelope is no longer deterministic but is stochastic in nature and converts the reporting from a deterministic factor of safety concept to a probability of failure for a given loading state. The analysis is visualized and quantified using the cumulative‐density‐function (CDF), which demonstrates the similarity between the stochastic results and the classical deterministic approach. To demonstrate a possible end use of the presented statistical analysis, a study of a woven composite laminate is presented where the ply orientation is estimated using ultrasound and the resulting CDF of failure is presented.Highlights Statistical analysis (Monte‐Carlo, mean value, first order, second moment) on the ply orientation variability via ultrasound inspection. Statistical analysis of classical laminate theory and FE based Tsai‐Wu failure model is developed and compared. Tsai‐Wu failure envelope is quantified and visualized using cumulative density function.

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confidence: 99%

A statistical approach for failure analysis involving uncertainty in determining ply orientation

Rahul,

Jack,

Smith

2024

Polymer Composites

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“…jδ jδ rad (8) Therefore, the phase difference between  E x rad and  E y rad is equal to 0, and excellent XPD performance will be obtained.…”

Section: Principle Of the Xpd Compensated Methods For Dual-reflector ...mentioning

confidence: 99%

“…The CFRP depolarization effect is studied using the layer‐by‐layer vector decomposition model. The reflector shell is a sandwich structure made up of two CFRP sheets separated by an aluminum/carbon honeycomb, 8 as shown in Figure 1A. The homogeneous CFRP sheet is approximately 0.2 mm thick, consisting of four thin carbon‐fiber layers.…”

Section: Theoretical Model Of Cfrp Depolarization Effectmentioning

confidence: 99%

A high XPD performance design method for satellite CFRP dual‐reflector antenna without metallizing reflectors

Wan

Zhang

et al. 2023

Micro & Optical Tech Letters

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The depolarization effect of carbon‐fiber reinforced plastics (CFRP) reflector is studied and a cross‐polarization discrimination (XPD) compensated method for dual‐reflector antenna without metallizing reflectors is presented in the paper. By setting the fibers direction of the main reflector orthogonal to that of the subreflector, the phase difference of the reflected electric field components from the first‐ and second‐layer of the CFPR sandwich can be compensated and depolarization effect would not happen. A dual‐reflector antenna operating at Ku band is designed, simulated and measured. The measured XPD of both the compensated and uncompensated designs are compared, and results show that XPD improves more than 3.0 dB. This method is a valid and low‐cost solution for dual‐reflector antennas in circular polarization to pursue excellent XPD performance, which is highly suitable for satellite larger‐aperture CFRP reflector antennas.

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“…For strong anisotropic materials, like fiber‐reinforced composites, without applied stresses, Hsu et al used the acoustic birefringence for layup orientation verification. Solodov et al showed it could be an efficient nondestructive method to know the stiffness asymmetry in composites through the output amplitude and phase stiffness, which can serve in addition for crack orientation detection.…”

Section: Introductionmentioning

confidence: 99%

Residual stress determination with acoustic birefringence in slightly anisotropic polymers

et al. 2015

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The acoustic birefringence method has been used since a long time for metallic materials to detect residual stresses. This method is rarely used for polymers and composites due to the strong attenuation of the acoustic signal. Moreover, for thermoplastic polymer, with a slight anisotropy (known as texture for metals), coupling with applied stresses, extends the complexity of the residual stresses determination. The slight anisotropy of thermoplastic polymer should be studied with shear waves prior to the residual stress determination. If the material is perfectly isotropic, we are able to detect and quantify the residual stresses. If the material is slightly anisotropic, it is also possible to evaluate residual stresses by taking into account the directions of the principal axes of material anisotropy. POLYM. ENG. SCI., 55:2307–2312, 2015. © 2015 Society of Plastics Engineers

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Characterization of CFRP Laminates’ layups using through-Transmitting ultrasound waves

Cited by 11 publications

References 6 publications

A statistical approach for failure analysis involving uncertainty in determining ply orientation

A statistical approach for failure analysis involving uncertainty in determining ply orientation

A high XPD performance design method for satellite CFRP dual‐reflector antenna without metallizing reflectors

Residual stress determination with acoustic birefringence in slightly anisotropic polymers

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