scholarly journals Effects of Interphase and Fibre Content on the Mechanical Behavior of Weft-Knitted Glass Fibre Reinforced Polypropylene

1997 ◽  
Vol 6 (2) ◽  
pp. 096369359700600 ◽  
Author(s):  
J. Karger-Kocsis ◽  
E. Moos ◽  
T. Czigány
Keyword(s):  
Mechanical Performance ◽  
Mechanical Tests ◽  
Fibre Content ◽  
Matrix Adhesion ◽  
Loading Mode ◽  
Static Tensile ◽  
Glass Fibre Reinforced ◽  
Flexural Tests ◽  
Commingled Yarns ◽  
Fibre Matrix

The mechanical performance of weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets produced by hot pressing of stacked knit layers was investigated. The knits were built-up of commingled yarns showing extremely different fibre/matrix adhesion. The GF content of the commingled yarns was 50 (≍ 26 vol.%) and 70 wt.% (≍45 vol.%), respectively. The effects of fibre/matrix adhesion and fibre content were characterized by dynamic-mechanical thermoanalysis (DMTA), static tensile and flexural tests in both course (C) and wale (W) direction of the knit. In addition, the sheets were subjected to instrumented falling weight perforation impact (IFWI). It was found that the knit structure-related stiffness anisotropy depended on the loading mode of the composites. The detrimental effect of the poor adhesion between GF and PP was well reflected in all mechanical tests conducted.

Development of novel high Tg polyimide-based composites. Part II: Mechanical characterisation

2017 ◽  
Vol 52 (2) ◽  
pp. 261-274 ◽  
Author(s):  
Spyros Tsampas ◽  
Patrik Fernberg ◽  
Roberts Joffe
Keyword(s):  
Elevated Temperature ◽  
Composite System ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Basic Material ◽  
Mechanical Characterisation ◽  
Short Beam ◽  
Fibre Treatment ◽  
Beam Shear ◽  
Fibre Matrix

In this study, the mechanical performance assessment of a newly developed carbon fibre-reinforced polyimide composite system T650/NEXIMID® MHT-R is presented. This system was subjected to a series of mechanical tests at ambient and elevated temperature (320℃) to determine basic material properties. Moreover, an additional test was conducted, using a T650/NEXIMID® MHT-R laminate in which the fibre sizing was thermally removed prior to laminate manufacturing, to investigate the effect of fibre treatment on mechanical performance. The experimental results indicated that the T650/NEXIMID® MHT-R composites along with exceptionally high Tg (360–420℃) exhibited competitive mechanical properties to other commercially available polyimide and epoxy-based systems. At elevated temperature, the fibre-dominated properties were not affected whilst the properties defined by matrix and fibre/matrix interface were degraded by approximately 20–30%. Finally, the fibre sizing removal did not affect the tensile and compressive strength, however, the shear strength obtained from short-beam shear test was deteriorated by approximately 15%.

Influence of Fibre Heating in PMC Production Technology

2006 ◽  
Author(s):  
A. Gisario ◽  
F. Quadrini ◽  
V. Tagliaferri
Keyword(s):  
Storage Modulus ◽  
Production Technology ◽  
Glass Fibre ◽  
Parallel Plate ◽  
Room Temperature ◽  
Mechanical Tests ◽  
Fibre Content ◽  
Heating Effect ◽  
Composite Fabrication ◽  
Glass Fibre Reinforced

Fibre heating can be employed to optimise composite fabrication in hand lamination. In order to show the fibre heating effect on the properties of hand laminated composites, dynamical and mechanical tests were performed on simply cured glass fibre reinforced laminates and on treated ones. In this second case the fibre content was heated before composite lamination by means of a hot parallel plate press. All the specimens were room temperature cured. A significant increase in storage modulus was observed as an effect of fibre heating as well as a data dispersion reduction. Additionally a lower thickness was measured due to the higher resin fluidity.

Adhesives for increasing the bonding strength of in situ manufactured metal-composite joints

2020 ◽  
pp. 095440702096575
Author(s):  
Robert Thomas ◽  
Fabian Fischer ◽  
Maik Gude
Keyword(s):  
Bonding Strength ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Storage Conditions ◽  
Mechanical Tests ◽  
Metal Composite ◽  
Scanning Calorimetry ◽  
Lap Shear ◽  
Glass Fibre Reinforced ◽  
Metallic Parts

In this present work, the potential of metallic parts, locally reinforced with a continuous glass fibre reinforced thermoset material, pre-impregnated with an epoxy matrix (prepreg), was evaluated by differential scanning calorimetry (DSC), single-lap shear tests and 3-point bending tests of a metal-composite hybrid hat profile. This technology is evaluated regarding an automotive use case, the DSC experiments in combination with moulding trials have proven curing times below 30 s for a moulding temperature of 180°C. A bonding strength of 13.5 MPa was characterized for a co-cured fibre-reinforced plastic (frp) onto a metallic joining partner. By additionally introducing an epoxy glue film as a bonding agent, which is co-cured together with the frp, the bonding strength can be increased significantly up to 25.4 MPa at the expense of the curing time. The mechanical tests on the hybrid hat profile have shown an increase of energy absorption compared with non-reinforced hat profiles. Here, also an additional glue film extends the performance regarding a co-cured plastic reinforcement without glue film. The influence of the storage conditions of the uncured prepreg materials on the mechanical performance was evaluated by a simulated physical ageing at elevated temperatures, followed by a mechanical characterization of the bonding strength and part performance. Also the effect of different testing temperatures and testing velocities on the capability of the metal-composite hybrid part is illustrated.

Effect of water absorption and stacking sequences on the properties of hybrid sisal/glass fibre reinforced polyester composite

2018 ◽  
Vol 233 (10) ◽  
pp. 2045-2056 ◽  
Author(s):  
MK Gupta ◽  
Vipul Deep
Keyword(s):  
Water Absorption ◽  
Glass Fibre ◽  
Morphological Analysis ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Static Compression ◽  
Effect Of Water ◽  
Polyester Composite ◽  
Glass Fibre Reinforced ◽  
Fibre Matrix

In this work, the effect of water absorption and stacking sequences on the mechanical properties (i.e. impact, tensile and flexural) of hybrid sisal/glass polyester composites has been studied. Each composite laminate is prepared by the hand lay-up technique followed by static compression using about 20 wt% of fibre content. Different stacking sequences are obtained by changing the position and number of glass layers keeping a total of eight plies in each composite. Water absorption behaviour is investigated by soaking the composite specimens in the distilled water until saturation and its characteristics such as sorption, diffusion and permeability coefficient are measured. The obtained results suggested that the mechanical and water resistance properties of sisal composites are considerably enhanced by the incorporation of glass fibre. There is 23%, 29% and 46% improvement in tensile strength, flexural strength and impact strength respectively in hybrid composites than that of sisal composite. However, the effect of water absorption showed a significant reduction in the mechanical performance of all the composites. Morphological analysis by scanning electron microscope has been also performed to support the statement as weakening of fibre–matrix interfacial bonding by water absorption.

scholarly journals Physico-mechanical and morphological studies of jute/glass reinforced epoxy composites and its hybrids

2021 ◽  
Author(s):  
Partha Pratim Das ◽  
◽  
Rohit Sahu ◽  
Vijay Chaudhary ◽  
Krovvidi Srinivas ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Hybrid Composites ◽  
Research Work ◽  
Experimental Studies ◽  
Mechanical Tests ◽  
Epoxy Composites ◽  
Morphological Studies ◽  
Glass Fibre Reinforced ◽  
Closed Mold ◽  
Composite Samples

Present research work emphasis on the fabrication and evaluation of the physico-mechanical performance of jute/glass fibre reinforced epoxy composites and their hybrids. Composite samples were fabricated by closed mold hand lay-up technique. Fibre/matrix interfacial adhesion of fractured specimens after mechanical tests was investigated using SEM (scanning electron microscope). Among J/Epoxy, G/Epoxy, J/G/Epoxy, J/G/Epoxy composites show the maximum Shore-D hardness value of 99 as compared to jute/epoxy and glass/epoxy of Shore-D hardness value of 96 and Hardness value of 98 Shore-D, respectively. Experimental studies have shown that there are superior Physico-mechanical properties of hybrid composites (jute/glass/epoxy).

scholarly journals Preparation and Performance Evaluation of Duotone 3D-Printed Polyetheretherketone as Oral Prosthetic Materials: A Proof-of-Concept Study

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1949
Author(s):  
Ling Ding ◽  
Wei Lu ◽  
Jiaqi Zhang ◽  
Chuncheng Yang ◽  
Guofeng Wu
Keyword(s):  
Titanium Dioxide ◽  
Performance Evaluation ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Flexural Properties ◽  
Proof Of Concept ◽  
Tooth Color ◽  
Dental Application ◽  
3D Printed ◽  
And Performance

Literature has reported the successful use of 3D printed polyetheretherketone (PEEK) to fabricate human body implants and oral prostheses. However, the current 3D printed PEEK (brown color) cannot mimic the vivid color of oral tissues and thus cannot meet the esthetical need for dental application. Therefore, titanium dioxide (TiO2) and ferric oxide (Fe2O3) were incorporated into PEEK to prepare a series of tooth-color and gingival-color PEEK composites in this study. Through color measurements and mechanical tests, the color value and mechanical performance of the 3D printed PEEK composites were evaluated. In addition, duotone PEEK specimens were printed by a double nozzle with an interface between tooth-color and gingival-color parts. The mechanical performance of duotone PEEK with two different interfaces (horizontal and vertical) was investigated. With the addition of TiO2 and Fe2O3, the colors of 3D printed PEEK composites become closer to that of dental shade guides. 3D printed PEEK composites generally demonstrated superior tensile and flexural properties and hence have great potential in the dental application. In addition, duotone 3D printed PEEK with a horizontal interfacial orientation presented better mechanical performance than that with a vertical one.

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