Strength of a cross-reinforced carbon-fiber plastic under impact loads

1984 ◽  
Vol 16 (8) ◽  
pp. 1087-1091
Author(s):  
K. K. Dudka ◽  
I. N. Preobrazhenskii
Keyword(s):  
Carbon Fiber ◽  
Impact Loads ◽  
Fiber Plastic ◽  
Carbon Fiber Plastic

Chemical stability of �pan carbon fiber plastic in various media

1986 ◽  
Vol 22 (7) ◽  
pp. 341-344
Author(s):  
I. S. Revenkova ◽  
A. V. Goryainova ◽  
L. L. Loichuk
Keyword(s):  
Carbon Fiber ◽  
Chemical Stability ◽  
Fiber Plastic ◽  
Carbon Fiber Plastic

scholarly journals Influence of the structure and thermomechanical properties of oriented carbon plastics on their tribotechnical characteristics

2021 ◽  
Vol 3 (12 (111)) ◽  
pp. 48-58
Author(s):  
Aleksandr Dykha ◽  
Olga Drobot ◽  
Viktor Oleksandrenko ◽  
Svitlana Pidhaichuk ◽  
Pavlo Yaroshenko ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Microstructural Analysis ◽  
Operating Conditions ◽  
Carbon Plastic ◽  
Friction Units ◽  
Carbon Plastics ◽  
Fiber Plastic ◽  
Plastic Metal ◽  
Carbon Fiber Plastic

It has been established that carbon plastics are increasingly used in various industries as structural materials. By the set of their properties, carbon plastics outperform steel, cast iron, alloys of non-ferrous metals. However, the application of these materials for parts of machine friction units is still limited due to the difficult operating conditions of modern tribosystems. This work aims to conduct a comprehensive experimental study of the tribological properties of materials in the tribosystem "carbon plastic-metal" taking into consideration their structure, as well as the mechanical-thermal characteristics. Comparative tests of the dependence of the friction coefficient on load for metal and polymeric anti-friction materials have shown a decrease in the friction coefficient for plastics by 3...4 times (textolite, carbotextolite, and carbon-fiber plastics). The influence of the filler orientation relative to the slip plane on the anti-friction properties of carbon-fiber plastics was investigated; it was found that the direction of fiber reinforcement in parallel to the friction area ensures less carbon-fiber plastic wear. A linear dependence of the wear intensity of carbon-fiber plastics, reinforced with graphite fibers, on the heat capacity and energy intensity of the mated steel surface has been established. Based on the microstructural analysis, a layered mechanism of the surface destruction of carbon-fiber plastics was established caused by the rupture of bonds between the fiber parts, taking into consideration the direction of the fibers' location to the friction surface. The results reported here could provide practical recommendations in order to select the composition and structure of materials for the tribosystem "carbon-fiber plastic-metal" to be used in machine friction units based on the criterion of improved wear resistance

scholarly journals Amorphous hydrogenated carbon films deposited by a closed-drift ion source

2003 ◽  
Vol 21 (2) ◽  
pp. 285-289 ◽  
Author(s):  
SERGEI P. BUGAEV ◽  
HUI-GON CHUN ◽  
NIKOLAY S. SOCHUGOV ◽  
KONSTANTIN V. OSKOMOV ◽  
ALEXANDER N. ZAKHAROV
Keyword(s):  
Carbon Fiber ◽  
Operation Mode ◽  
High Hardness ◽  
Carbon Films ◽  
Ion Source ◽  
Large Area ◽  
Fiber Plastic ◽  
Source Operation ◽  
Amorphous Hydrogenated Carbon ◽  
Carbon Fiber Plastic

The general possibility of the extended (∼30 cm) closed-drift ion source application for deposition of wear-resistant amorphous hydrogenated carbon (a-C:H) films on large-area dielectric substrates, in particular, on carbon-fiber plastic, is shown. Parameters of the “ion” and the “plasma” regimes of the ion source operation in argon and methane are defined. It is shown that the ion current nonuniformity is in the range of ±5–15% depending on the operation mode. Optimum conditions for the substrate precleaning in argon and hard, well-adhered a-C:H films deposition from methane are determined. The films are characterized by high hardness (∼11 GPa) and low surface roughness (∼0.13 nm) that leads to a several times lower friction coefficient (0.05) and wear rate (0.001 μm3m−1N−1) compared to glass and carbon-fiber plastic substrates.

scholarly journals Experimental analysis of composite scarf adhesive joints modified with multiwalled carbon nanotubes under bending and thermomechanical impact loads

2019 ◽  
Vol 234 (1) ◽  
pp. 48-64 ◽  
Author(s):  
UA Khashaba ◽  
Ramzi Othman ◽  
IMR Najjar
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Multiwalled Carbon Nanotubes ◽  
Adhesive Joints ◽  
Impact Loads ◽  
Fiber Reinforced ◽  
Multiwalled Carbon ◽  
Impact Tests ◽  
Carbon Fiber Reinforced ◽  
The Impact

Scarf adhesive joints have attracted an increasing attention in joining/repairing of carbon fiber reinforced epoxy composite structures due to their zero eccentricity, which provides lower stress distribution across the adhesive layer and better aerodynamic surfaces compared to other bonded joints. The main objective of this study is to evaluate the performance of the scarf adhesive joints in carbon fiber reinforced epoxy composites under thermomechanical impact loads, which is very important for the aerospace and automotive industries. The adhesive was modified with optimum percentage of multiwalled carbon nanotubes. The impact tests were performed at 25 ℃, 50 ℃, and 75 ℃. The residual flexural properties of the unfailed impacted joints were measured using three-point bending test. Results from impact tests at 25 ℃, 50 ℃, and 75 ℃ showed improvement in the impact bending stiffness of the modified scarf adhesive joints by 8.3%, 7.4%, and 11.8% and maximum contact force by 15.6%, 21.3%, and 18.9%, respectively. The energy at failure of the modified scarf adhesive joints with multiwalled carbon nanotubes was improved by 15.2% and 16.4% respectively at 25 ℃ and 50 ℃. At test temperature of 75 ℃, the scarf adhesive joints have hysteresis load–displacement behavior and energy–time curve with rebound energy of 35% and absorbed (damage) energy of 65%. The residual flexural strength of the modified and unmodified scarf adhesive joints is 98.2% and 86.1% respectively, while their residual moduli have remarkable decrease to 71.7% and 81.3%.

Theoretical Assessment Of The Bearing Capacity Of A Steel Beam Reinforced With Carbon Fiber

2020 ◽  
pp. 18-22
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Adhesive Layer ◽  
Carbon Plastic ◽  
Steel Beams ◽  
Steel Beam ◽  
Fiber Plastic ◽  
Fiber Materials ◽  
Short Time ◽  
Theoretical Assessment

To reinforce steel beams, modern carbon fiber materials that are attached to the beam from the stretched side using a special two-component adhesive can be effectively used. Compared to traditional methods of cross-section increase by means of additional steel elements attached by welding or on bolts, reinforcing with carbon fiber plastic has a number of advantages. Carbon plastic has a much smaller weight than a steel element that has the same load-bearing capacity; the adhesive layer prevents corrosion of the reinforced element; work on strengthening is carried out in a short time and with less labor expenditures etc. The article presents the results of theoretical studies of beams reinforced with carbon fiber lamellas. For the theoretical assessment of the strength of a reinforced steel beam, deformations and stresses in the section at the elastic, elastic-plastic and plastic stages of steel work are considered. It is established that a significant effect of carbon fiber reinforcement is observed even when the stresses in it are determined by the strength of the adhesive joint. Formulas, taking into account the strength of the adhesive layer determined experimentally, for determining the strength of a reinforced beam are obtained. A theoretical model of the operation of bent steel elements is constructed and theoretical dependencies are obtained that can be used for calculations of steel beams reinforced with carbon plastic.

Sign in / Sign up

Export Citation Format

Share Document