Effect of fiber orientation on the tensile properties of cross-ply laminates of PP reinforced continuous carbon fiber

This paper presents an experimental study of tensile properties, using a carbon–polypropylene uni-directional sheet with a thickness of 0.15 mm, which shows that highly non-linear stress–strain curves can be achieved with cross-angle-ply laminates. Generally, these properties are studied from the scanning electronic microscope and X-ray computed tomography. Cross-ply laminates with fiber orientation angles from 15 to 60° are investigated and it is found that there are the pseudo-ductile behavior with the fiber rotation, especially at fiber orientation angles from 30° to 60°.The Pseudo-ductile behavior is a phenomenon in which the apparent strain increases after yielding with strain hardening. It is greatly affected by the fiber reorientation in the loading direction. The fiber reorientation is allowed the plasticity of the polypropylene and thickness of each layer.

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Application of X-ray Computed Tomography to Measuring Fiber Orientation Distribution of Chopped Carbon Fiber Tape Reinforced Thermoplastics

Applied Composite Materials ◽

10.1007/s10443-021-09875-1 ◽

2021 ◽

Author(s):

Guangbin Cai ◽

Takehiro Shirai ◽

Yi Wan ◽

Kiyoshi Uzawa ◽

Jun Takahashi

Keyword(s):

Computed Tomography ◽

Carbon Fiber ◽

Fiber Orientation ◽

Orientation Distribution ◽

X Ray ◽

Fiber Orientation Distribution ◽

X Ray Computed ◽

Reinforced Thermoplastics

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Fiber orientation quantification utilizing X-ray micro-computed tomography

Journal of Composite Materials ◽

10.1177/0021998320962555 ◽

2020 ◽

pp. 002199832096255

Author(s):

Jennifer M Sietins ◽

Jessica C Sun ◽

Daniel B Knorr Jr

Keyword(s):

Computed Tomography ◽

Fiber Orientation ◽

Mechanical Performance ◽

Ct Scans ◽

Micro Computed Tomography ◽

Orientation Data ◽

Orientation Analysis ◽

X Ray ◽

Software Analysis ◽

X Ray Computed

It is well known that the mechanical performance of composite materials is highly dependent on the fiber orientation. Several techniques have historically been used to quantify fiber orientation experimentally. Newer methods have involved 3 D X-ray computed tomography (CT) scans due to the high resolution that is now achievable within a laboratory setting. The accuracy of the analysis, however, is a function of the resulting scan image quality and the specific parameters influencing the resulting orientation analysis. This report summarizes a methodology to quantify fiber orientation from 3 D CT scans. Optimal scanning parameters are presented taking into account both the necessary resolution, geometric unsharpness, and the scan volume size. The influence of varied software analysis parameters and their effects on the resulting orientation data is discussed. The selection of software analysis parameters was independently validated with optical microscopy on a sample with only two fibers. Lastly, the orientation analysis was applied to a 0/+45/−45/90 composite to demonstrate this technique on a larger scale.

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The Evolution of Internal Damage Identified by Means of X-Ray Computed Tomography in Two Steels and the Ensuing Relation with Gurson’s Numerical Modelling

10.20944/preprints201812.0234.v1 ◽

2018 ◽

Author(s):

Fernando Suárez ◽

Federico Sket ◽

Jaime Gálvez ◽

David A. Cendón ◽

José M. Atienza ◽

...

Keyword(s):

Tensile Test ◽

Steel Wire ◽

The Finite Element Method ◽

Internal Damage ◽

X Ray ◽

Prestressing Steel ◽

Steel Wires ◽

Loading Direction ◽

X Ray Computed ◽

Standard Steel

This paper analyses the evolution of the internal damage in two types of steel that show different fracture behaviours, with one of them being the initial material used for manufacturing prestressing steel wires, which shows a flat fracture surface perpendicular to the loading direction, and the other one being a standard steel used in reinforced concrete structures, which shows the typical cup-cone surface. 3mm-diameter cylindrical specimens are tested with a tensile test carried out in several loading stages and, after each of them, unloaded and analysed with X-ray tomography, which allows detection of internal damage throughout the tensile test. In the steel used for reinforcement, damage is developed progressively in the whole specimen, as predicted by Gurson-type models, while in the steel used for manufacturing prestressing steel-wire damage is developed only in the very last part of the test. In addition to the experimental study, a numerical analysis is carried out by means of the finite element method by using a Gurson model to reproduce the material behaviour.

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Combining digital image correlation with X-ray computed tomography for characterization of fiber orientation in unidirectional composites

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2020.106234 ◽

2020 ◽

pp. 106234

Author(s):

Mahoor Mehdikhani ◽

Christian Breite ◽

Yentl Swolfs ◽

Martine Wevers ◽

Stepan V. Lomov ◽

...

Keyword(s):

Computed Tomography ◽

Digital Image Correlation ◽

Digital Image ◽

Fiber Orientation ◽

Image Correlation ◽

Unidirectional Composites ◽

X Ray ◽

X Ray Computed

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Structure analysis of needle-punched nonwoven fabrics by X-ray computed tomography

Textile Research Journal ◽

10.1177/0040517517736470 ◽

2017 ◽

Vol 89 (1) ◽

pp. 20-31 ◽

Cited By ~ 1

Author(s):

Tatsuya Ishikawa ◽

Yujiro Ishii ◽

Kengo Nakasone ◽

Yutaka Ohkoshi ◽

Kim Kyoung Hou

Keyword(s):

Tensile Properties ◽

Fiber Volume Fraction ◽

Volume Fraction ◽

Structural Parameters ◽

Normal Direction ◽

Fiber Volume ◽

X Ray ◽

Nonwoven Fabrics ◽

Needle Punching ◽

X Ray Computed

Needle-punching conditions determine the structure of nonwoven fabrics and the structure determines their tensile properties. However, the structural parameters of nonwoven fabrics and the relationship between these parameters and tensile properties have not been quantitatively analyzed. Therefore, we analyzed the structure of needle-punched nonwoven fabrics by X-ray computed tomography (XCT). The relationships between the needle-punching conditions, tensile properties, and structural parameters, such as fiber-volume fraction and three-dimensional fiber orientation, were investigated. The fiber-volume fraction in the middle layer of the fabric was clearly larger than that of the bulk above a compression ratio of 1.4. With increasing needle penetration depth, the fibers tended to become oriented both parallel and perpendicular to the normal direction of the fabric plane while avoiding the intermediate direction. A linear relationship was found between the obtained volume fraction of fibers oriented in the normal direction and the tensile strength of the fabric. These results demonstrate that XCT image analysis is effective to evaluate the structure of needle-punched nonwoven fabrics and to design the properties of nonwoven fabrics.

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