A multi-parameter model for stiffness prediction of composite laminates with out-of-plane ply waviness

Zhu, Jun; Wang, Jihui; Ni, Aiqing; Guo, Wantao; Li, Xiang; Wu, Yi Bo

doi:10.1016/j.compstruct.2017.11.020

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…In order to determine the mechanical response of laminates with wrinkle defects, it is necessary to describe the wrinkle mathematically. Sine or cosine waveforms are commonly used to describe the geometric shape of wrinkles [ 9 , 10 , 20 ]. In this paper, the isosceles triangle function is used to substitute and improve the cosine wrinkle model; the two models have the same wrinkle height and length, as shown in Figure 2 .…”

Section: Analytical Modelmentioning

confidence: 99%

“…A wrinkle is one of the most common initial defects of fiber-reinforced composite structures [ 1 , 2 , 3 ], and it is a primary source of heterogeneity of geometry and material [ 4 , 5 , 6 , 7 ]. In addition, the wrinkle defects can change the mechanical response of composite structures and cause three-dimensional stress problems [ 8 , 9 , 10 ]. Wrinkles can also significantly influence the mechanical properties, such as the stiffness and strength of composite structures [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Zhu [ 9 ] extended Hsiao’s theoretical model and proposed a three-dimensional stiffness analysis method to quantitatively analyze the three-dimensional equivalent elastic properties of laminates with wrinkle defects. Zhu [ 10 ] also systematically studied the relationship between the multiple characteristic parameters of wrinkle defects and the stiffness performance of laminates through a specific program. However, the model was only applicable to out-of-plane wrinkles, without considering the influence of the off-axis of in-plane fibers, and it was found to have a large deviation in Takeda’s study [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the spatial geometric characteristics of wrinkle defects and the anisotropy of composite materials, the mechanical response generated by wrinkles often shows three-dimension elastic characteristics. In addition, although some examples in the literature [ 9 , 10 , 21 ] used sine or cosine functions to describe the wrinkle shape, the integral calculation process of high-order sine or cosine functions in the model is complex and inefficient. Finally, more parameters are needed to describe those functions in the models, which is not convenient for non-destructive testing and mechanical performance evaluation of composite structures with wrinkle defects.…”

Section: Introductionmentioning

confidence: 99%

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A Three-Dimensional Equivalent Stiffness Model of Composite Laminates with Wrinkle Defects

Mei

2022

Materials

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The stiffness of composite laminates is easily affected by wrinkle defects. In this paper, a new effective analytical model was proposed to predict the three-dimensional equivalent elastic properties of multidirectional composite laminates with wrinkle defects. Firstly, a geometric model was established according to the microscopic characteristics of wrinkle defects. Then, based on the classical laminate theory and homogenization method, the constitutive equation and flexibility matrix of the wrinkle region were established. Finally, the equivalent stiffness parameters of unidirectional and multidirectional laminates were derived, and the effects of different wrinkle parameters and ply-stacking sequences on the stiffness of unidirectional and multidirectional laminates were studied by using the analytical model. The results show that the mechanical properties of the lamina and laminates are affected by the out-of-plane angle and in-plane angle of the wrinkle defects. The accuracy of the analytical model has been verified by the numerical model and other theoretical models, and it has the characteristics of few parameters and a high efficiency. The analytical model can be used to predict the stiffness of composite structures with wrinkle defects simply, effectively, and quantitatively. It can also be used as a tool to provide the mechanical response information of laminates with wrinkle defects.

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Section: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Three-Dimensional Equivalent Stiffness Model of Composite Laminates with Wrinkle Defects

Mei

2022

Materials

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“…The evolution and accumulation of fiber waviness will affect the strength, stiffness, and fatigue life of the composite structure. 6,7 Such type defect increases the probability of FRPs’ structural failure subjected to mechanical impacts or environmental changes in the course of service life. In order to prevent these potential catastrophes and economic losses, the quantitative, rapid, and accurate non-destructive testing of fiber waviness in FRPs is of great significance in industries for structure integrity and maintenance.…”

Section: Introductionmentioning

confidence: 99%

The wavenumber imaging of fiber waviness in hybrid glass–carbon fiber reinforced polymer composite plates

Zhang

Ren

Song

et al. 2021

Journal of Composite Materials

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Out-of-plane waviness is one of the most common defects which degenerates the strength, stiffness, and fatigue life of hybrid glass–carbon fiber–reinforced polymer composites (FRPs). An accurate and high-speed non-destructive testing method is highly desired for large composite structures in industries. Ultrasonic phased array is a great candidate for such application. This paper applies the wavenumber algorithm to image the waviness in hybrid FRP plates which are a multi-layered medium. The central frequency of 5 MHZ is chosen in order to maximize the ply resonance. Transducers are migrated virtually to each interface between glass and carbon plies in order to overcome the difficulty of wave propagation analysis in such multi-layered system. The wavenumber algorithm demonstrates a better computational performance compared to that of the traditional total focusing method (TFM) in time domain up to 6 times. The glass ply depth and waviness angle can be more accurately presented with relative errors less than 1.5% and 14.8%, respectively. In addition, the resin-rich defect characterization is also achievable with a maximum error of 14.4%.

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Carbon fiber and carbon fiber composites—creating defects for superior material properties

Nitai,

Chowdhury,

Inam

et al. 2024

Adv Compos Hybrid Mater

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Recent years have seen a rise in the use of carbon fiber (CF) and its composite applications in several high-tech industries, such as the design of biomedical sensor components, 3D virtual process networks in automotive and aerospace parts, and artificial materials or electrodes for energy storage batteries. Since pristine CF have limited properties, their properties are often modified through a range of technologies, such as laser surface treatment, electron-beam irradiation grafting, plasma or chemical treatments, electrophoretic deposition, carbonization, spinning-solution or melt, electrospinning, and sol–gel, to greatly improve their properties and performance. These procedures cause faulty structures to emerge in CF. The characteristics and performances of CF (thermo-electric conductivity, resistivity, stress tolerance, stiffness and elasticity, chemical resistivity, functionality, electrochemical properties, etc.) vary greatly depending on the modification technique used. Thus, the purpose of this review is to demonstrate how the insertion of faults can result in the production of superior CF. The characteristics of CF defects were examined using a variety of analytical techniques, such as defect-forming chemistry, molecular organization, and ground-level chemistries like their crystallinities. Finally, some future work is also included. Graphical abstract

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A multi-parameter model for stiffness prediction of composite laminates with out-of-plane ply waviness

Cited by 13 publications

References 27 publications

A Three-Dimensional Equivalent Stiffness Model of Composite Laminates with Wrinkle Defects

A Three-Dimensional Equivalent Stiffness Model of Composite Laminates with Wrinkle Defects

The wavenumber imaging of fiber waviness in hybrid glass–carbon fiber reinforced polymer composite plates

Carbon fiber and carbon fiber composites—creating defects for superior material properties

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