Characteristics of CFRP Structure of Bending Strength and Rigidity According to Stacking Orientation Angle

Kim, Ji Hoon; Ae, Joo Jeong; Bang, Jung Min; Kim, Jung Ho; Yang, In Young

doi:10.4028/www.scientific.net/amr.83-86.530

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Taking the spatial wavefield signal f (x, y, t) as an example, the imaginary part expression of the corresponding analytical signal is obtained after convolving the spatial wavefield signal with the kernel function of the Riesz transform. The Riesz transform process of f (x, y, t) can be defined by equation (1):…”

Section: Riesz Transformmentioning

confidence: 99%

Lamb wavefield-based monogenic signal processing for quantifying delamination in composite laminates

Sun

Shao²,

Song³

et al. 2022

Smart Mater. Struct.

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Delamination is one of the common damages affecting the safety of composite structures. In this paper, a Lamb wavefield-based monogenic signal processing algorithm is proposed to quantify the delamination parameters in composite laminates, including location, size, shape, and depth. A quality-guided fast phase unwrapping algorithm is developed to solve the problem of phase wrapping after Riesz transform-based monogenic signal processing. Then, space distribution of the phase of Lamb wavefield can be extracted for calculating wavenumber distribution, which is related to the structural thickness or delamination depth and can be used for delamination imaging. Simulated Lamb wavefield signals calculated by finite element simulation are employed to evaluate the parameters of delamination in composite laminates. Compared with other traditional methods, the damage identification algorithm based on Riesz transform has excellent identification effect and shorter calculation time. The results show that the algorithm can be used not only for single delamination recognition but also for multi-delamination recognition with good accuracy. In particular, the interaction between incident waves along different ply directions and delamination is explored, and its influence on delamination quantification is studied, whose results are worthy of attention in engineering application. Finally, a completely non-contact laser ultrasonic system is established to obtain the Lamb wavefield with delamination. Experiments show that the algorithm can accurately quantify the location, size, shape, and depth of delamination.

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Section: Riesz Transformmentioning

confidence: 99%

Lamb wavefield-based monogenic signal processing for quantifying delamination in composite laminates

Sun

Shao²,

Song³

et al. 2022

Smart Mater. Struct.

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“…Carbon fiber reinforced polymer (CFRP) is widely used in aerospace aircraft structures due to its desirable properties, including high strength, temperature and fatigue resistance, low density, and corrosion resistance. 1 However, the structure will inevitably be affected by impact events such as tools, birds, debris, hail or other fine debris during the manufacturing, service and maintenance processes. [2][3][4] In most cases, the above scenarios are classified as low-velocity impacts.…”

Section: Introductionmentioning

confidence: 99%

Influence of various damage mechanisms on the low‐velocity impact response of composite laminates

Zou,

Gao,

2023

Polymer Composites

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This study exhibits the effect of different damage mechanisms on the mechanical behavior of composite laminates subjected to low‐velocity impact load. To achieve this, seven low‐velocity impact energies were applied to laminates with five different thicknesses and four unique stacking sequences. The extent of damage was quantitatively evaluated through contact measurements and ultrasonic C‐scan techniques. Numerical simulations, showing good agreement with experimental results, characterized the distribution and evolution of damage within the laminates. The findings reveal that when matrix and delamination damage are predominant, the dent depth increases slowly and is visually invisible, while the delamination area expands almost linearly. Conversely, When fiber damage prevails, the laminate absorbs more energy, leading to rapid increases in dent depth, the appearance of visible cracks, and the occurrence of sharp fluctuations with multiple peaks in contact force and displacement curves. Nonetheless, the delamination area and projection tend to be stable and unchanged. Furthermore, alterations in thickness and stacking sequence directly affect the damage characteristics and energy absorption properties. This research offers valuable theoretical insights and serves as a reference for enhancing the comprehension of the failure mechanism of laminates and optimizing their performance.Highlights Demonstrate the utility of dent depth in identifying changes in damage mechanisms. Evaluate the delamination damage of laminates after impacts by ultrasonic C‐scan techniques. Reveal the regulation of impact response parameters for different damage mechanisms. Investigate the effect of variation in thickness on damage characteristics and energy absorption. Evaluate the impact resistance of laminates with different stacking sequences.

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Advanced Orthogonal Frequency and Phase Modulated Waveform for Ultrasonic Phased Array TFM Detection in CFRP Composites

Shen,

Wu,

Luo

et al. 2024

IEEE Trans. Instrum. Meas.

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Characteristics of CFRP Structure of Bending Strength and Rigidity According to Stacking Orientation Angle

Cited by 6 publications

References 6 publications

Lamb wavefield-based monogenic signal processing for quantifying delamination in composite laminates

Lamb wavefield-based monogenic signal processing for quantifying delamination in composite laminates

Influence of various damage mechanisms on the low‐velocity impact response of composite laminates

Advanced Orthogonal Frequency and Phase Modulated Waveform for Ultrasonic Phased Array TFM Detection in CFRP Composites

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