scholarly journals Manufacturing Aspects of Creating Low-Curvature Panels for Prospective Civil Aircraft

Aerospace ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 18 ◽  
Author(s):  
Evgeny Dubovikov ◽  
Danil Fomin ◽  
Natalia Guseva ◽  
Ivan Kondakov ◽  
Evgeny Kruychkov ◽  
...  
Keyword(s):  
High Weight ◽  
High Strength ◽  
Strength Characteristics ◽  
Labor Input ◽  
Manufacturing Costs ◽  
Low Weight ◽  
Civil Aircraft ◽  
Blended Wing Body

For this study, structural and manufacturing schemes for low-curvature pressurized fuselage panels were proposed, making it possible to provide high weight efficiency for the airframes of prospective civil blended wing-body (BWB) aircraft. The manufacturing scheme for low-curvature panels helped to achieve high strength characteristics of the composite details as well as decreased the labor input necessary for manufacturing and assembling. The beneficial features of the proposed structure are that the panels have a low weight, incur low manufacturing costs, and satisfy the demands of repairability.

Study of Strength and Deformation Properties of the Composite Reinforcing Bar from the Continuous Basalt Fiber

2020 ◽  
Vol 1013 ◽  
pp. 132-138
Author(s):  
L.Yu. Stupishin ◽  
S.G. Emelyeanov ◽  
E.V. Savelyeva ◽  
M.L. Moshkevich
Keyword(s):  
Composite Structures ◽  
Test Procedure ◽  
Basalt Fiber ◽  
High Strength ◽  
Test Method ◽  
Strength Characteristics ◽  
Reinforcing Bar ◽  
Low Weight ◽  
Deformation Properties ◽  
Weight One

Composite structures require the use of modern reinforcing materials combining high strength characteristics and resistance to aggressive influences with low weight. One of the promising materials for the production of reinforcing products is basalt roving. The high strength of the thread in combination with fragility imposes certain limitations on its placement in the material, and requires new approaches to the design of the reinforcing bar itself. The article investigates the strength characteristics of a composite reinforcing bar made of a basalt complex thread proposed by the authors. The features of the test procedure and the mechanical characteristics of the reinforcing material are described. The effectiveness of the applied test method developed in the process of testing reinforcing rods is shown. An increase in the tensile strength of a composite reinforcing bar based on basalt fiber is established in comparison with products from fiber and roving.

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

scholarly journals WePBAS: A Weighted Pixel-Based Adaptive Segmenter for Change Detection

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2672
Author(s):  
Wenhui Li ◽  
Jianqi Zhang ◽  
Ying Wang
Keyword(s):  
Change Detection ◽  
High Weight ◽  
State Of The Art ◽  
Diffusion Mechanism ◽  
Background Modeling ◽  
Background Model ◽  
Dynamic Background ◽  
Low Weight ◽  
Model Update ◽  
Sample Set

The pixel-based adaptive segmenter (PBAS) is a classic background modeling algorithm for change detection. However, it is difficult for the PBAS method to detect foreground targets in dynamic background regions. To solve this problem, based on PBAS, a weighted pixel-based adaptive segmenter named WePBAS for change detection is proposed in this paper. WePBAS uses weighted background samples as a background model. In the PBAS method, the samples in the background model are not weighted. In the weighted background sample set, the low-weight background samples typically represent the wrong background pixels and need to be replaced. Conversely, high-weight background samples need to be preserved. According to this principle, a directional background model update mechanism is proposed to improve the segmentation performance of the foreground targets in the dynamic background regions. In addition, due to the “background diffusion” mechanism, the PBAS method often identifies small intermittent motion foreground targets as background. To solve this problem, an adaptive foreground counter was added to the WePBAS to limit the “background diffusion” mechanism. The adaptive foreground counter can automatically adjust its own parameters based on videos’ characteristics. The experiments showed that the proposed method is competitive with the state-of-the-art background modeling method for change detection.

Experimental Research of the Durability, Crack Resistance of the Normal Sections of Bending Elements Produced of Rubber Concrete with Fiber and their Deformability

2018 ◽  
Vol 931 ◽  
pp. 232-237 ◽  
Author(s):  
Aleksei E. Polikutin ◽  
Yuri B. Potapov ◽  
Artem V. Levchenko
Keyword(s):  
Crack Resistance ◽  
Experimental Research ◽  
High Strength ◽  
Strength Characteristics ◽  
Material Consumption ◽  
Load Bearing ◽  
Fiber Concrete ◽  
Rubber Concrete ◽  
Concrete Elements

The article describes experimental research of bending rubber fiber concrete elements with favorable deformation-strength characteristics. The use of such a material as fiberrubcon in load-bearing structures due to its high strength leads to a decrease in material consumption and weight of structures.

scholarly journals High strength and low weight hollow carbon fibres

2017 ◽  
Vol 254 ◽  
pp. 042017 ◽  
Author(s):  
T. Köhler ◽  
R. Brüll ◽  
F. Pursche ◽  
J. Langgartner ◽  
G. Seide ◽  
...  
Keyword(s):  
High Strength ◽  
Carbon Fibres ◽  
Low Weight ◽  
Hollow Carbon

Effect of crosslinking agents on the strength characteristics of cellulosic fabrics using 23 32 mixed level factorial

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Farhana Naeem ◽  
Fareha Asim ◽  
Muhammad Tufail
Keyword(s):  
High Strength ◽  
Strength Characteristics ◽  
Blend Ratio ◽  
Tear Strength ◽  
Content Type ◽  
Factors Affecting ◽  
Acrylate Copolymer ◽  
Curing Method ◽  
Crosslinking Agents ◽  
Significant Factors

Purpose Low pilling and wrinkle-free appearance of cellulosic fabrics are always demanded. Resin finishes are applied to improve these properties, but there is an adverse effect of the resin finish as it tends to reduce the strength of the fabrics. Therefore, the effect of the two most important finishes; anti-pilling and resin finish, on the strength characteristics of 100% viscose and 50:50 Viscose/cotton plain and satin fabrics were investigated in this paper. The purpose of this study is to identify significant factors affecting the strength of fabrics finished with crosslinking agents [non-ionic acrylate copolymer and (dimethyloldihydroxyethyleneurea)]. Design/methodology/approach A statistical model of 23 32 mixed level factorial design was used for the study. Appratan N9211 (A) and Arkofix NF (B) were tested at three concentrations, whereas three factors fabric; weave (C), blend ratio (D) and curing method (E) were tested at two levels. The performance of the finish was evaluated by two response variables, which were tensile and tear strength. Findings The various conditions of high strength values of the fabrics were presented in this paper. It was found that the tear strength of the fabrics increased after finishing except for 50:50 viscose/cotton plain fabric, whereas the tensile strength of plain fabrics is better at shock cure and for a satin normal cure is better. The model adequacy plots exhibit that the assumptions of normality and independence are not desecrated. Moreover, the values of “predicted R2” are in reasonable agreement with the “adjusted R2,” which confirms that models have been accounted for most of the inconsistency. Originality/value This paper is a part of my PhD dissertation. Unlike the previous studies, this paper investigated the effect of two crosslinking agents, Appretan N9211 as anti-pilling and Arkofix NF as wrinkle resistant agents on 100% viscose and 50:50 viscose/cotton plain and satin. Three different concentrations of both the crosslinking agents were used. Also, fixation of the finishes was carried out at a normal cure and shock cure.

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