INFLUENCE OF CLIMATIC AGEING ON THE PROPERTIES OF HIGH-TEMPERATURE CARBON FIBER REINFORCED PLASTICS

2021 ◽  
pp. 39-51
Author(s):  
I.N. Gulyev ◽  
◽  
I.V. Zelenina ◽  
E.O. Valevin ◽  
M.A. Khaskov ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
Cold Climate ◽  
Temperate Climate ◽  
Fiber Reinforced ◽  
Humid Climate ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Presents the results of of research of the properties of a series of high-temperature carbon plastics based on phthalonitrile resin after long-term exposure in various climatic zones: temperate climate, moderately warm climate with mild winters, warm humid climate, very cold climate are presented. The state of the surface of carbon fiber reinforced plastics has been investigated, their thermal stability and water absorption have been determined. After exposure, CFRPs showed high retention of properties from the level of the initial values: 80–90% at room temperature of tests and 60–75% at a temperature of 300 °С.

Effect of long climatic aging on microstructure and fracture features of epoxy сarbon-fiber-reinforced plastics under bending and compression load

2019 ◽  
pp. 170-184
Author(s):  
I. S. Deev ◽  
E. V. Kurshev ◽  
S. L. Lonsky ◽  
O. A. Komarova
Keyword(s):  
Carbon Fiber ◽  
Temperate Climate ◽  
Fiber Reinforced ◽  
Humid Climate ◽  
Compression Load ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Fracture Features

The paper describes results of microstructural and fractographic research of fracture features for epoxy carbon-fiber-reinforced plastics under static bend and compression load after long (till 5 years) climatic aging in different climatic zones of Russia (industrial zone of temperate climate of Moscow – MTsKI; temperate warm climate of Gelendzhik – GTsKI; warm humid climate of Sochi – GNIP, Russian Academy of Sciences). Changes of microstructure and main types of destruction in the volume of carbon fiber reinforced plastics have been established. It is shown that changes of structure and torsion nature of fracture in volume epoxy carbon-fiber-reinforced plastics are typical for all zones of climatic aging and are defined by processes of complex manifestation of mechanical stresses and chemical destruction of materials.

INCREASING SENSITIVITY OF EDDY CURRENT NON-DESTRUCTIVE TESTING OF DELAMINATION IN CARBON-FIBER REINFORCED PLASTICS

2021 ◽  
pp. 28-37
Author(s):  
P. N. Shkatov ◽  
G. A. Didin ◽  
A. A. Ermolaev
Keyword(s):  
Carbon Fiber ◽  
Eddy Current ◽  
Calculation Model ◽  
Fiber Reinforced ◽  
Destructive Testing ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
The Difference

The paper is concerned with increasing sensitivity of eddy current nondestructive testing of most dangerous delamination in carbon-fiber reinforced plastics (CFRP). Increased sensitivity is achieved by separate registration and comparison of eddy current signals obtained from a set of stratifications of carbon fibers with the same orientation. The separation of eddy current signals is possible due to pronounced anisotropy of the electrical conductivity of the layers dominant in the direction of the fibers of the corresponding layer. Eddy-current signals are registered by eddy current probes with maximum sensitivity in a given angular direction. Prior to the scan eddy current signals of the probe are leveled on a defect-free area. The influence of the working gap on the difference between the eddy current signals of the probe is suppressed by normalizing it according to one of the signals. The analysis of the registered signals from delamination has been performed using an approximate calculation model. The reliability of the obtained results has been confirmed by comparison with experimental results and calculations using the finite element method.

Rotary Ultrasonic Machining: Effects of Tool End Angle on Delamination of CFRP Drilling

2017 ◽  
Author(s):  
Palamandadige K. S. C. Fernando ◽  
Meng (Peter) Zhang ◽  
Zhijian Pei ◽  
Weilong Cong
Keyword(s):  
Carbon Fiber ◽  
Material Removal ◽  
Ultrasonic Machining ◽  
Fiber Reinforced ◽  
Rotary Ultrasonic Machining ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Hole Making ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Aerospace, automotive and sporting goods manufacturing industries have more interest on carbon fiber reinforced plastics due to its superior properties, such as lower density than aluminum; higher strength than high-strength metals; higher stiffness than titanium etc. Rotary ultrasonic machining is a hybrid machining process that combines the material removal mechanisms of diamond abrasive grinding and ultrasonic machining. Hole-making is the most common machining operation done on carbon fiber reinforced plastics, where delamination is a major issue. Delamination reduces structural integrity and increases assembly tolerance, which leads to rejection of a part or a component. Comparatively, rotary ultrasonic machining has been successfully applied to hole-making in carbon fiber reinforced plastics. As reported in the literature, rotary ultrasonic machining is superior to twist drilling of carbon fiber reinforced plastics in six aspects: cutting force, torque, surface roughness, delamination, tool life, and material removal rate. This paper investigates the effects of tool end angle on delamination in rotary ultrasonic machining of carbon fiber reinforced plastics. Several investigators have cited thrust force as a major cause for delamination. Eventhogh, it is found on this investigation, tool end angle has more significant influence on the delamination in rotary ultrasonic machining of carbon fiber reinforced plastics comparing to cutting force and torque.

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