scholarly journals Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 1)

2018 ◽  
Vol 47 (1) ◽  
pp. 5-22
Author(s):  
Mirosław Rodzewicz ◽  
Jerzy Lewitowicz
Keyword(s):  
Inverse Problem ◽  
Comparative Analysis ◽  
Historical Perspective ◽  
Strength Properties ◽  
Strength Analysis ◽  
Structural Elements ◽  
Composite Shells ◽  
Reinforced Plastics ◽  
Advanced Composites ◽  
Fiber Reinforced Plastics

Abstract The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

scholarly journals Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 2)

2018 ◽  
Vol 47 (1) ◽  
pp. 23-43
Author(s):  
Mirosław Rodzewicz ◽  
Jerzy Lewitowicz
Keyword(s):  
Inverse Problem ◽  
Comparative Analysis ◽  
Historical Perspective ◽  
Strength Properties ◽  
Strength Analysis ◽  
Structural Elements ◽  
Composite Shells ◽  
Reinforced Plastics ◽  
Advanced Composites ◽  
Fiber Reinforced Plastics

Abstract The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

High-temperature carbon plastics based on thermoreactive polyimide binder

2020 ◽  
pp. 89-102
Author(s):  
M. I. Valueva ◽  
I. V. Zelenina ◽  
M. A. Zharinov ◽  
M. A. Khaskov
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Strength Properties ◽  
High Glass Transition Temperature ◽  
Reinforced Plastics ◽  
Carbon Plastics ◽  
Fundamental Possibility ◽  
Fiber Reinforced Plastics

The article presents results of studies of experimental carbon plastics based on thermosetting PMRpolyimide binder. Сarbon fiber reinforced plastics (CFRPs) are made from prepregs prepared by melt and mortar technologies, so the rheological properties of the polyimide binder were investigated. The heat resistance of carbon plastics was researched and its elastic-strength characteristics were determined at temperatures up to 320°С. The fundamental possibility of manufacturing carbon fiber from prepregs based on polyimide binder, obtained both by melt and mortar technologies, is shown. CFRPs made from two types of prepregs have a high glass transition temperature: 364°C (melt) and 367°C (solution), with this temperature remaining at the 97% level after boiling, and also at approximately the same (86–97%) level of conservation of elastic strength properties at temperature 300°С.

Mechanical Properties of Carbon Fiber Reinforced Plastics under Hot-Wet Environment

2011 ◽  
Vol 462-463 ◽  
pp. 207-212 ◽  
Author(s):  
Hideaki Katogi ◽  
Kenichi Takemura ◽  
Yoshinobu Shimamura
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Strength Properties ◽  
Distilled Water ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Weight Gains ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Water absorption behavior and flexural strength properties of carbon fiber reinforced plastics (CFRP) under hot-wet environment were examined. Those of epoxy resin were also examined for reference. Weight gains of CFRP and epoxy resin were measured after immersion in distilled water at temperatures under 90°C. Quasi-static flexural tests of CFRP and epoxy resin were conducted after immersion for 180 days. Weight gains of CFRP and epoxy resin increased with increasing water temperature. After immersion for 180 days at 90°C, weight gain of CFRP became 3.3times higher and that of epoxy resin was 2.3 times higher than that at RT, respectively. When CFRP and epoxy resin were immersed in distilled water at 90°C, weight gains of CFRP and epoxy resin increased and then decreased. Flexural strengths of CFRP and epoxy resin decreased in distilled water at temperatures less than 90°C. Flexural strengths of dried CFRP and epoxy resin after immersion recovered but were lower than that of virgin CFRP and epoxy resin. Debonding of fiber/resin interface and crack initiation in epoxy resin in distilled water resulted in the strength reduction.

scholarly journals Effect Of Technological Parameters Of Production Of Tfp Preforms Of Gas Turbine Engine Blades On Their Physical And Mechanical Properties

2021 ◽  
Vol 12 (5) ◽  
pp. 56-64
Author(s):  
Orlov Maksim Andreyevich Et al.
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Gas Turbine ◽  
Physical And Mechanical Properties ◽  
Gas Turbine Engine ◽  
Strength Properties ◽  
Technological Parameters ◽  
Turbine Engine ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

The article discusses the features of the destruction of carbon fiber reinforced plastics on the basis of tfp-preforms produced using various stitching mode parameters, and provides for studies of their physical and mechanical properties and structure. The effect of the carbon fiber laying density and the piercing step of the aramid yarn on the elastic-strength properties of composites is shown. The optimal technological parameters for creating tfp-preforms of gas turbine engine blades were chosen.

scholarly journals Micromechanical strength analysis of fiber reinforced plastics

PAMM ◽  
2006 ◽  
Vol 6 (1) ◽  
pp. 157-158
Author(s):  
Gerald Ernst ◽  
Christian Hühne ◽  
Raimund Rolfes
Keyword(s):  
Strength Analysis ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

Buckling Modes of Structural Elements of Off-Axis Fiber-Reinforced Plastics

2018 ◽  
Vol 54 (2) ◽  
pp. 133-144 ◽  
Author(s):  
V. N. Paimushin ◽  
N. V. Polyakova ◽  
S. A. Kholmogorov ◽  
M. A. Shishov
Keyword(s):  
Structural Elements ◽  
Fiber Reinforced ◽  
Buckling Modes ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics
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