Bulging initiation and propagation in fiber-reinforced swellable Mooney–Rivlin membranes

AbstractThis article considers a thin-walled hollow cylinder, which is composed of a fibrous and swellable hyperelastic material. The fibers are arranged in two families and they are taken to be parallel within each fiber family. The two fiber families are also assumed to be mechanically equivalent and symmetrically disposed in the ground substance material. At each instant of the homogeneous swelling, the material is taken to be incompressible. This article studies the interplay of swelling, fiber orientation, and the mechanical properties of the constituents on the initiation as well as on the axial propagation of bulging.

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Prediction for the mechanical property of short fiber-reinforced polymer composites through process modeling method

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705718799815 ◽

2018 ◽

Vol 32 (11) ◽

pp. 1525-1546 ◽

Cited By ~ 3

Author(s):

Yue Mu ◽

Anbiao Chen ◽

Guoqun Zhao ◽

Yujia Cui ◽

Jiejie Feng ◽

...

Keyword(s):

Mechanical Properties ◽

Fiber Orientation ◽

Orientation Distribution ◽

Fiber Reinforced Composites ◽

Fiber Reinforced Polymer ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Reinforced Polymer ◽

Fiber Reinforced Polymer Composites ◽

Fiber Orientation Distribution

The fiber-reinforced polymer composites are important alternative for conventional structural materials because of their excellent comprehensive performance and weight reduction. The mechanical properties of such composite materials are mainly determined by the fiber orientation induced through practical manufacturing process. In the study, a through process modeling (TPM) method coupling the microstructure evolution and the mechanical properties of fiber-reinforced composites in practical processing is presented. The numerical methodology based on the finite volume method is performed to investigate three-dimensional forming process in the injection molding of fiber-reinforced composites. The evolution of fiber orientation distribution is successfully predicted by using a reduced strain closure model. The corresponding finite volume model for TPM is detailedly derived and the pressure implicit with splitting of operators (PISO) algorithm is employed to improve computational stability. The flow-induced multilayer structure is successfully predicted according to essential flow characteristics and the fiber orientation distribution. The mechanical properties of such anisotropy composites is further calculated based on the stiffness analysis and the Tandon–Weng model. The improvement of mechanical properties in each direction of the injection molded product are evaluated by using the established mathematical model and numerical algorithm. The influences of the geometric structure of injection mold cavity, the fiber volume fractions, and the fiber aspect ratios on the mechanical properties of composite products are further discussed. The mathematical model and numerical method proposed in the study can be successfully adopted to investigate the structural response of composites in practical manufacturing process that will be helpful for optimum processing design.

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Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

Journal of Reinforced Plastics and Composites ◽

10.1177/0731684418777120 ◽

2018 ◽

Vol 37 (15) ◽

pp. 1020-1034 ◽

Cited By ~ 3

Author(s):

Christoph Lohr ◽

Björn Beck ◽

Frank Henning ◽

Kay André Weidenmann ◽

Peter Elsner

Keyword(s):

Mechanical Properties ◽

High Pressure ◽

Injection Molding ◽

Fiber Orientation ◽

Polyphenylene Sulfide ◽

Injection Molding Process ◽

Fiber Reinforced ◽

Molding Process ◽

Glass Fiber Reinforced ◽

Foam Injection Molding

The MuCell process is a special injection molding process which utilizes supercritical gas (nitrogen) to create integral foam sandwiches. The advantages are lower weight, higher specific properties and shorter cycle times. In this study, a series of glass fiber-reinforced polyphenylene sulfide foam blanks are manufactured using the MuCell injection molding process. The different variations of the process (low-pressure also known as structural foam injection molding) and high-pressure foam injection molding (also known as “core back expansion,” “breathing mold,” “precision opening,” decompression molding) are used. The sandwich structure and mechanical properties (tensile strength, bending strength, and impact behavior) of the microcellular and glass fiber-reinforced polyphenylene sulfide foams are systematically investigated and compared to compact material. The results showed that the injection parameters (injection speed, foaming mechanism) played an important role in the relative density of microcellular polyphenylene sulfide foams and the mechanical properties. It could be shown that the specific tensile strength decreased while increasing the degree of foaming which can be explained by the increased number of cells and the resulting cell size. This leads to stress peaks which lower the mechanical properties. The Charpy impact strength shows a significant dependence on the fiber orientation. The specific bending modulus of the high-pressure foaming process, however, surpasses the values of the other two processes showing the potential of this manufacturing variation especially with regard to bending loads. Furthermore, a high dependence of the mechanical properties on the fiber orientation of the tested specimens can be found.

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Robotic Manufacturing of Near-Net Shaped Short-Fiber Reinforced Composites With Functional Properties

ASME 2009 International Manufacturing Science and Engineering Conference, Volume 2 ◽

10.1115/msec2009-84158 ◽

2009 ◽

Author(s):

Antony Paul ◽

Jeffery M. Gallagher ◽

Raymond J. Cipra ◽

Thomas Siegmund

Keyword(s):

Mechanical Properties ◽

Fiber Orientation ◽

Fiber Composite ◽

Imaging Techniques ◽

Short Fiber ◽

Robotic Arm ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Geometric Data ◽

Reinforced Composite

Fiber reinforced composite materials are now frequently being used over conventional materials for their ability to achieve tailored properties and performance characteristics. With the recent advancements in manufacturing techniques, short-fiber composites are coming into prominence in this sector, with their cost advantage and their capability for large throughput. Randomness of fiber orientation is inherent to short fiber composite manufacturing processes. In order to effectively manipulate the mechanical properties of a short-fiber reinforced composite, it is imperative to adequately control the orientation of the fibers during the deposition stage. A process is currently developed to acquire geometrical data of the target object and to utilize it to create a short-fiber reinforced component with controlled fiber orientation. The topological data acquisition of the object is made possible using non-contact 3D imaging techniques. The geometric data is then transferred to a commercial CAD package for the added capability to manipulate the geometry as may be required for specific applications. Subsequently, geometric data constitutes the basis of path planning for the tooling processes. In our process, a novel rapidly re-configurable tooling and molding technology is employed by which a 6-axis robotic arm is used to sculpt a pin-device vacuum surface. After the tooling is completed, the robotic arm will use a deposition nozzle to orient a steady stream of initially random short-fiber from a feeder into a unidirectional output, onto the tool surface. By controlling the position and orientation of the deposition nozzle, it is possible to control the orientation and density of fiber in each section of the near-net shaped composite pre-form. The fiber pre-form is then impregnated with a suitable matrix medium and cured to create the required component. The outlined process is thus capable of manufacturing a near-net shaped short-fiber reinforced component with highly specific mechanical properties. One of the many applications envisaged using this process is the manufacture of custom form-fitting braces, masks and guards for use in healthcare products. A patient intervention can have his or her features acquired using stereo-imaging and have corrective measures incorporated into the device prior to manufacturing. By controlling the orientation and density of the fiber at different portions of the device, it is possible to provide adequate support at specific areas or to restrict movement in specific directions while providing compliance to movement in the others.

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Study of Mechanical Properties of Glass–Jute-Fiber-Reinforced Hybrid Composites by Varying Its Fiber Orientation and Resins

Lecture Notes on Multidisciplinary Industrial Engineering - Recent Advances in Material Sciences ◽

10.1007/978-981-13-7643-6_26 ◽

2019 ◽

pp. 329-338 ◽

Cited By ~ 1

Author(s):

R. Hari Kishore ◽

M. Thambi Babu ◽

M. Pandu Ranga Rao ◽

G. Sasidhar

Keyword(s):

Mechanical Properties ◽

Fiber Orientation ◽

Hybrid Composites ◽

Jute Fiber ◽

Fiber Reinforced

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Fiber Reinforced Composite Based Functionally Gradient Materials

Advanced Composites Letters ◽

10.1177/096369359800700403 ◽

1998 ◽

Vol 7 (4) ◽

pp. 096369359800700 ◽

Cited By ~ 6

Author(s):

VK Ganesh ◽

S Ramakrishna ◽

HJ Leck

Keyword(s):

Mechanical Properties ◽

Fiber Orientation ◽

Orientation Angle ◽

Gradient Material ◽

Material System ◽

Test Results ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Reinforced Composite ◽

Functionally Gradient

A method of fabricating fiber-reinforced composite based functionally gradient material is described in this paper. The material has continuously varying mechanical properties along the length. The continuous variation of the mechanical properties is achieved by continuously varying the fiber orientation using the braiding process. The test results indicate an elastic modulus increase by about 42% from the largest braid angle to the smallest braid angle for the material system and the orientation angle considered in the present study.

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