Strain energy and finite element analysis to predict the mechanical properties of vapor grown carbon fiber reinforced polypropylene nanocomposites

2020 ◽  
Author(s):  
Ashok Kumar Bagha ◽  
Shashi Bahl
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Fiber ◽  
Strain Energy ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Polypropylene Nanocomposites ◽  
Carbon Fiber Reinforced

The Study on Carbon Fiber Reinforced Concrete Beams Based on Finite Element Analysis

2012 ◽  
Vol 430-432 ◽  
pp. 331-336
Author(s):  
Jian Hua Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Carbon Fiber Reinforced

Carbon fiber-reinforced polymer (CFRP) sheets have recently become popular for use as repair or rehabilitation material for deteriorated carbon fiber reinforced concrete structures. Carbon fiber reinforced concrete beams were analyzed by finite element software ANASYS. Through the finite element analysis, the results showed that using bonded CFRP to strengthen R. C. beams can significantly increase their load carrying capacity. However, the beams with prestressed CFRP can withstand larger ultimate loads than beams with bonded CFRP. Using bonded CFRP to strengthen R. C. beams can obviously reduce the ultimate deflection.

scholarly journals Finite Element Analysis of Lightning Damage Factors Based on Carbon Fiber Reinforced Polymer

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5210
Author(s):  
Yansong Zhu ◽  
Yueke Ming ◽  
Ben Wang ◽  
Yugang Duan ◽  
Hong Xiao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Fiber ◽  
Fiber Reinforced Polymers ◽  
Fiber Direction ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Carbon Fiber Reinforced

While carbon-fiber-reinforced polymers (CFRPs) are widely used in the aerospace industry, they are not able to disperse current from lightning strikes because their conductivity is relatively low compared to metallic materials. As such, the undispersed current can cause the vaporization or delamination of the composites, threatening aircraft safety. In this paper, finite element models of lightning damage to CFRPs were established using commercial finite element analysis software, Abaqus, with the user-defined subroutines USDFLD and HEAVEL. The influences of factors such as the structural geometry, laminate sequence, and intrinsic properties of CFRPs on the degree of damage to the composites are further discussed. The results showed that when a current from lightning is applied to the CFRP surface, it mainly disperses along the fiber direction in the outermost layer. As the length of the CFRP increases, the injected current has a longer residence time in the material due to the increased current exporting distance. Consequently, larger amounts of current accumulate on the surface, eventually leading to more severe damage to the CFRP. This damage can be alleviated by increasing the thickness of the CFRP, as the greater overall resistance makes the CFRP a better insulator against the imposed current. This study also found that the damaged area increased as the angle between the first two layers increased, whereas the depth of the damage decreased due to the current dispersion between the first two layers. The analysis of the electrical conductivity of the composite suggested that damage in the fiber direction will be markedly reduced if the conductivity in the vertical fiber direction increases approximately up to the conductivity of the fiber direction. Moreover, increasing the thermal conductivity along the fiber direction will accelerate the heat dissipation process after the lightning strike, but the influence of the improved thermal conductivity on the extent of the lightning damage is less significant than that of the electrical conductivity.

Stress analysis of a carbon fiber-reinforced epoxy plate with a hole undergoing tension: A comparison of finite element analysis, strain gages, and infrared thermography

2018 ◽  
Vol 52 (19) ◽  
pp. 2679-2689 ◽  
Author(s):  
Habiba Bougherara ◽  
Muhammad Saleem ◽  
Suraj Shah ◽  
Lotfi Toubal ◽  
Ahmed Sarwar ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Fiber ◽  
Stress Field ◽  
Infrared Thermography ◽  
Von Mises Stress ◽  
Strain Gages ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Carbon Fiber Reinforced

This is the first study, to the authors' knowledge, to simultaneously perform a direct comparison of finite element analysis, strain gage measurements, and infrared thermography for stress analysis under both static and dynamics tensile loads of the classic geometry of a composite plate with a center hole. The plate was made from a carbon fiber-reinforced epoxy composite with dimensions of 250 mm length × 25 mm width × 2.2 mm thickness and a 5 mm diameter center hole. Using static tensile loads of 1000 N, 2000 N, and 3000 N, the plate Von Mises stress field was evaluated using strain gages versus finite element analysis. Using cyclic tensile loads of 1000 N and 1600 N at 5 Hz, the plate Von Mises stress field was assessed using strain gages versus infrared thermography. The strain gages versus finite element analysis line-of-best-fit showed poor agreement (slope = 2.1, R = 0.81), although the slope could easily be applied as a correction factor when comparing the two methods. The strain gages versus infrared thermography showed much better agreement (slope = 0.95, R = 0.91). Finite element analysis displayed a “butterfly” stress field around the hole with peaks of 73.5 MPa (at 1000 N), 147 MPa (at 2000 N), and 220.5 MPa (at 3000 N). Infrared thermography showed a “ring” of high stress around the hole with peaks of 74.8 MPa (at 1000 N) and 102.9 MPa (at 1600 N). All three methods showed similar relative trends for the carbon fiber-reinforced epoxy plate.

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