Macroscopic characterization of fiber micro-buckling and its influence on composites tensile performance

Zhao, Cong; Wang, Bendong; Xiao, Jun

doi:10.1177/0731684416678670

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…The fiber pull-up is similar to the wrinkling (buckling) and has important influence on composites mechanical performance. 29–33 When the fiber is deposited on a curved path, it will result in compressive forces and tensile forces applied through the width of the fiber. If tensile forces are too high, fiber will be lifted beyond the mandrel surface on the outside the steered tow.…”

Section: Effect Of the Roll Of The Compaction Roller On The Fiber Pulmentioning

confidence: 99%

Effect of the attitude fine-adjustment of compaction roller on automated fiber placement defects and trajectory

Cheng

Zhao

Chen

et al. 2019

Journal of Reinforced Plastics and Composites

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Automated fiber placement shows great potential for fabricating complex aircraft structures. During AFP process, the process-induced defects and placement trajectory have important effect on the processing quality. These defects and trajectory are influenced by many factors, where the attitude of compaction roller is an important factor. By the attitude fine-adjustment of compaction roller, the placement defects and trajectory can be improved. It is necessary to study the effect of the attitude fine-adjustment of compaction roller on placement defects and trajectory. The attitude includes yaw and roll of compaction roller, and the placement defects mainly refer to the fitness degree and fiber pull-up. Firstly, the placement ability of compaction roller is defined by making full use of the allowable distance. Then, the yaw angle and position of compaction roller are calculated by differential geometry. Meanwhile, the yaw distance and placement width are given. Secondly, the fiber pull-up is defined and described as planar sinusoidal based on the fiber waviness theory. Then the roll angle and position of compaction roller are given. Finally, a series of experiments and simulations had been conducted to verify the feasibility of the developed method. Results demonstrate that the method can improve the placement defects and trajectory.

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Section: Effect Of the Roll Of The Compaction Roller On The Fiber Pulmentioning

confidence: 99%

Effect of the attitude fine-adjustment of compaction roller on automated fiber placement defects and trajectory

Cheng

Zhao

Chen

et al. 2019

Journal of Reinforced Plastics and Composites

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“…Different carbon fiber ply angles will inevitably affect their service properties. Due to the limited deformation of tow, the local steering radius of the placement path must be greater than the minimum steering radius determined by the material properties, otherwise it will produce wrinkles, tears, and other distortions, which will affect the surface quality and result in a decrease in strength as high as 57.7% [ 22 ]. This problem is well-described in References [ 23 , 24 , 25 , 26 ], which presents the results of both experimental testing and numerical calculations regarding the influence of placement angle on the properties of composite plates and profiles under compression.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experiment Studies of Different Path Planning Methods on Mechanical Properties of Composite Components

Wang

Xiao

et al. 2021

Materials

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The purpose of this paper is to study the effects of different trajectory planning methods on the mechanical properties of components. The scope of the research includes finite element simulation calculation and experimental tests of the actual structure. The test shall be carried out in the whole load range until the failure of the structure occurs. Taking the composite conical shell as an example, a variable angle initial path generation method of the conical shell surface is proposed, and the parallel offset algorithms based on partition and the circumferential averaging are proposed to fill the surface. Then, finite element analysis is carried out for the paths that satisfy the manufacturability requirements, the analysis results show that the maximum deformation and maximum transverse as well as longitudinal stress of fiber of circumferential averaging variable angle path conical shell are reduced by 16.3%, 5.85%, and 19.76%, respectively, of that of the partition variable angle path. Finally, the strength analysis of conical shells manufactured by different trajectory design schemes is carried out through finite element analysis and actual failure tests. The finite element analysis results are in good agreement with the experimental results of the actual structure. The results show that the circumferential uniform variable angle has good quality, and it is proved that the path planning algorithm that coordinates path planning and defect suppression plays an important role in optimizing placement trajectory and improving mechanical properties of parts.

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“…Moreover, Liu et al 40 and Nguyen and Wang 41 used micromechanics modeling for investigation of progressive failure in woven composite laminates containing cutouts. Also, the micromechanics-based models also have been used for prediction of micro-buckling in laminated composites 42 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of stiffener effects on buckling strength of composite laminates with circular cutout

Shojaee

Mohammadi

Madoliat

2019

Journal of Composite Materials

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In the notched structures, to achieve maximum buckling resistance in comparison with structural weight, the optimal design of a stiffener is very important. In this research, after a review of the existing literature, nonlinear buckling behavior of composite plates containing the cutout with three different designs of stringer was investigated. The considered stiffeners are planer, longitudinal, and ring types. The buckling experiments were carried out on the stiffened plates containing a circular notch. Moreover, to achieve an efficient prediction of the buckling in the stiffened laminate with the hole, a finite strip method is developed based on the Airy stress function and von Karman’s large deformation equations. Studies show that there is a good agreement between the postbuckling behaviors derived from developed finite strip method with experimental results. Fast convergence of the considered finite strip method compared with the finite element results shows its efficiency for prediction of buckling behavior in laminated composites. The results show that the buckling load-bearing capacities of perforated plates with a longitudinal and planer stiffener are higher compared with the other stiffener, respectively. The detailed parametric study on the effects of thickness of the plate and stiffener and opening diameter on buckling behavior was performed using experiments and modeling.

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Macroscopic characterization of fiber micro-buckling and its influence on composites tensile performance

Cited by 12 publications

References 26 publications

Effect of the attitude fine-adjustment of compaction roller on automated fiber placement defects and trajectory

Effect of the attitude fine-adjustment of compaction roller on automated fiber placement defects and trajectory

Numerical and Experiment Studies of Different Path Planning Methods on Mechanical Properties of Composite Components

Experimental and numerical investigation of stiffener effects on buckling strength of composite laminates with circular cutout

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