A Study on Impact Strength of CFRP Using Infrared Thermography

2012 ◽  
Vol 628 ◽  
pp. 390-395 ◽  
Author(s):  
Hee Jae Shin ◽  
Lee Ku Kwac ◽  
Sun Ho Ko ◽  
Tae Hoon Kim ◽  
Hong Gun Kim
Keyword(s):  
Thermal Characteristics ◽  
High Strength ◽  
Reinforced Plastics ◽  
Advanced Composite ◽  
Average Temperature ◽  
Advanced Composite Materials ◽  
Weight Test ◽  
Strength And Stiffness ◽  
Falling Weight ◽  
The Impact

Of the advanced composite materials for aerospace structures such as aircrafts and space devices, the carbon fiber reinforced plastics (CFRP) is applied to many sectors that require lightweight materials for its high strength and stiffness. One of the disadvantages of the CFRP, however, is that it is weak against impact. In this study, impact test specimens were manufactured with five fiber stacking angles (0°/0°, 0°/15°, 0°/30°, 0°/45°, 0°/90°) according to ASTM D7136[15], and a falling weight test was performed to analyze the correlation between their mechanical and thermal characteristics. As a result, the impact energy applied to the five test specimens with different fiber stacking angles was almost constant at 30.63 J - 30.78 J. The absorbed energy increased with the increase in the fiber stacking angle, and decreased after 0°/45°. The average temperature on the fractured surface increased with the increase in the fiber stacking angle in all specimens other than the 0°/0° specimen.

Study on Impact Characteristics of CFRP Structural Member According to Stacking Conditions

2014 ◽  
Vol 680 ◽  
pp. 254-257
Author(s):  
Ju Ho Choi ◽  
Yong Jun Yang ◽  
Cheon Seok Cha ◽  
In Young Yang
Keyword(s):  
High Strength ◽  
Structural Member ◽  
Reinforced Plastics ◽  
Advanced Composite ◽  
Collapse Characteristics ◽  
Advanced Composite Materials ◽  
Fiber Reinforced Plastics ◽  
Strength And Stiffness ◽  
Impact Characteristics ◽  
The Impact

CFRP (Carbon Fiber Reinforced Plastics) is an anisotropic material which is the most widely adapted lightweight structural member. CFRP of the advanced composite materials as structure materials for vehicles has a widely application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness. The CFRP Square members were made of 8ply unidirectional prepreg sheets stacked at different angles and interface numbers. Based on the collapse characteristics of CFRP member, the collapse characteristics and energy absorption capability were analyzed. The impact collapse tests were carried out for each section member. The purpose is to examine experimentally absorption behavior and strength evaluation depending on changes in the stacking configuration when the CFRP Square member s with different stacking configuration is exposed to separate impact velocity.

scholarly journals Research underway in the Minakuchi Lab – new fiber features to control crack propagation in composite materials

Impact ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 20-21
Author(s):  
Shu Minakuchi
Keyword(s):  
Composite Materials ◽  
Aerospace Industry ◽  
Reinforced Plastics ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Wide Range ◽  
Technological Developments ◽  
Materials Used ◽  
The University ◽  
Carbon Fibre Reinforced Plastics

Composite materials are materials that are made by combining one or two materials. Composite materials have been used by humans for thousands of years but as technological developments increase, more and more examples of composite materials have been created which has led to a staggering number of innovations in a wide range of different fields. One major example of this is the aerospace industry which relies on materials that are strong but light. It is essential that an aircraft is strong enough to resist the enormous stresses that are placed on it by its mechanisms and the environment in which it operates, but light enough to be propelled thousands of miles into the sky. Some of the most abundant composite materials used in the aerospace industry are carbon fibre reinforced plastics (CFRP) which are the focus of Dr Shu Minakuchi's research team at the Minakuchi Laboratory within the Department of Aeronautics and Astronautics, The University of Tokyo. Minakuchi's team is working on advanced composite materials represented by CFRPs, with a view to overcoming some of the problems associated with cracks from stresses and their propagation.

A Methodology for the Parametric Exploration of the Impact of Production Planning on the Early Stages of Design

2014 ◽  
Author(s):  
Dennis J. L. Siedlak ◽  
Todd M. Schmidt ◽  
Olivia J. Pinon ◽  
Dimitri N. Mavris
Keyword(s):  
Visual Analytics ◽  
Manufacturing Industry ◽  
Aircraft Design ◽  
Proof Of Concept ◽  
Advanced Composite ◽  
Early Stages ◽  
Aircraft Manufacturing ◽  
Advanced Composite Materials ◽  
Modeling Techniques ◽  
The Impact

The increasing use of advanced composite materials in recent aircraft programs calls for new ways to conduct design. This paper presents a methodology that brings manufacturing and production considerations in the early stages of aircraft design as a means to help alleviate some of the new design challenges that the aircraft manufacturing industry is facing. In particular, this paper discusses how the proposed methodology integrates surrogate modeling techniques with visual analytics capabilities to provide the designer with a better understanding of the interface and trades that exist between performance, manufacturing, and production at the later stages of Conceptual design. A composite redesigned F-86 Sabre wing-box is used as a proof-of-concept for this research.

Penetration Fracture Characteristics of CFRP Curved Shells According to Oblique Impact

2006 ◽  
Vol 306-308 ◽  
pp. 291-296 ◽  
Author(s):  
In Young Yang ◽  
Young Jea Cho ◽  
Kwang Hee Im ◽  
Cheon Seok Cha ◽  
Young Nam Kim
Keyword(s):  
Slope Angle ◽  
High Strength ◽  
Structural Materials ◽  
Oblique Impact ◽  
Steel Ball ◽  
Curvature Radius ◽  
Transverse Impact ◽  
Reinforced Plastics ◽  
Impact Surface ◽  
The Impact

CFRP (Carbon Fiber Reinforced Plastics) of the advanced composite materials as structural materials for vehicles, has a wide application in light weighs structural materials of airplanes, ships and automobiles because of high strength and stiffness. However, there is a design variable to be considered in practical application of the laminate composite material, that is, this material is vulnerable to transverse impact. This paper aims at evaluating the effects of curvature and oblique impact on the penetration characteristics of composite laminate shells. They are stacked to [02/902]S, [03/903]S and [02/903/0]S, [0/902/0]S and their interlaminar number two and four. Those specimens were prepared to varied curvature radius (R=100, 150, 200mm and ∞). They are cured by heating to the appropriate hardening temperature (130oC) by means of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100mm×140mm. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic-screen sensors located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decreased and slope angle on the impact surface increased.

Mechanical and Fracture Mechanical Properties of Matrix-Reinforced Carbon Fiber Composites with Carbon Nanotubes

2019 ◽  
Vol 809 ◽  
pp. 615-619 ◽  
Author(s):  
Gerhard Sinn ◽  
Gerald Singer ◽  
Leo Jocher ◽  
Miriam M. Unterlass ◽  
Harald Rennhofer ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Strength ◽  
Negative Influence ◽  
Carbon Fiber Composites ◽  
Bending Tests ◽  
Reinforced Plastics ◽  
Aerospace Applications ◽  
Four Point Bending ◽  
Low Weight ◽  
Strength And Stiffness

Carbon fiber reinforced Plastics are materials with high strength and stiffness at low weight compared to metals. These properties make the materials ideal candidate for structures in aerospace applications, where they are often used under bending conditions. Due to the strongly anisotropic composition the CFRP typically fail in compression by fiber buckling. In order to improve this weakness, nanotube and nanofiber reinforced matrix was used to build CFRP. Four-point bending tests showed that stiffness and strength could be improved by the fillers, whereas negative influence was found on fracture energy.

The Impact Collapse Characteristics of Al/CFRP Members for Light-Weight

2006 ◽  
Vol 321-323 ◽  
pp. 881-884
Author(s):  
In Young Yang ◽  
Kil Sung Lee ◽  
Cheon Seok Cha
Keyword(s):  
Energy Absorption ◽  
Fiber Orientation ◽  
Brittle Failure ◽  
Orientation Angle ◽  
Specific Strength ◽  
Reinforced Plastics ◽  
Collapse Characteristics ◽  
Fiber Orientation Angle ◽  
Strength And Stiffness ◽  
The Impact

In this study, the impact collapse tests were performed to investigate collapse characteristics of Al/CFRP member which were composed of aluminum members wrapped with CFRP (Carbon Fiber Reinforced Plastics) outside aluminum member. Aluminum members absorb energy by stable plastic deformation, while CFRP members absorb energy by unstable brittle failure with higher specific strength and stiffness than those in the aluminum member. In an attempt to achieve a synergy effect by combing the two members, Al/CFRP members were manufactured and impact collapse tests were performed for the members. Based on the respective collapse characteristics of aluminum and CFRP members, the collapse modes and energy absorption capability were analyzed for Al/CFRP member which have different fiber orientation angle of CFRP. Test results showed that the collapse of the Al/CFRP member complemented unstable brittle failure of the CFRP member due to ductile nature of the inner aluminum member and the fiber orientation angle of Al/CFRP members influence energy absorption capability and collapse mode.

Analysis on Unwinding Effect of FRP-OFBG Cables

2011 ◽  
Vol 704-705 ◽  
pp. 1017-1023 ◽  
Author(s):  
M.L. Ma ◽  
J. Guo ◽  
Hui Li ◽  
W.L. Chen
Keyword(s):  
Quality Control ◽  
Corrosion Resistance ◽  
Control Method ◽  
High Strength ◽  
Test System ◽  
Light Weight ◽  
Advanced Composite ◽  
Quality Control Method ◽  
Advanced Composite Materials ◽  
Material Test System

As one kind of the advanced composite materials (ACM), FRP is now getting widely used in civil engineering for its advantages as light weight, electromagnetic isolation, high strength, fatigue resistance and corrosion resistance. This article wants to provide a quality control method for the FRP cables by eliminating its unwinding effect error. Firstly, two FRP-OFBG (Optical Fiber Bragg Grating) cables were fabricated in factory, and then the two specimens were tested by the MTS (material test system). Secondly, theoretical understandings with boundary conditioned formulas were provided for analysis on the unwinding process of the cable. After that the unwinding displacement of the FRP-OFBG cable was obtained by using the b-value method. Finally, a service ability assessment of the cable was given before the conclusions.

Types and Course of Development of Advanced Composite Materials

2013 ◽  
Vol 438-439 ◽  
pp. 253-256
Author(s):  
Xuan Liu ◽  
Hai Xie
Keyword(s):  
Composite Materials ◽  
Polymer Matrix Composites ◽  
Large Fraction ◽  
Chemical Properties ◽  
High Strength ◽  
Matrix Composites ◽  
Advanced Composite ◽  
High Stiffness ◽  
Advanced Composites ◽  
Advanced Composite Materials

Advanced composite materials (ACMs) are also known as advanced polymer matrix composites. These are generally characterized or determined by unusually high strength fibers with unusually high stiffness, or modulus of elasticity characteristics, compared to other materials, while bound together by weaker matrices. These are termed advanced composite materials (ACMs) in comparison to the composite materials commonly in use such as reinforced concrete, or even concrete itself. The high strength fibers are also low density while occupying a large fraction of the volume. Advanced composites exhibit desirable physical and chemical properties that include light weight coupled with high stiffness (elasticity), and strength along the direction of the reinforcing fiber, dimensional stability, temperature and chemical resistance, flex performance and relatively easy processing. Advanced composites are replacing metal components in many uses, particularly in the aerospace industry.

EFFECT OF CFRP STRIPS BONDING LOCATION ON FLEXURAL CAPACITY AND DUCTILITY OF REINFORCED CONCRETE BEAMS

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Mina Iskander ◽  
Mina Melad ◽  
Mourad Yasser ◽  
Waleed Abdel Rahim ◽  
Amr Mosa ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Traditional Methods ◽  
Flexural Strengthening ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
The Impact ◽  
Strength And Ductility

Strengthening reinforced concrete beams using laminate of advanced composite materials has gained ground recently due to its lower cost and simplicity compared to traditional methods. These traditional methods are usually done by either increasing the reinforcement or the beam’s dimensions, which naturally requires formwork, and hinder the structural usage. One of the most impediments of using bonded laminate in strengthening beams is debonding. In flexural strengthening of beams, this debonding occurs via mid-span debonding or end-delamination of the laminate. Herein, ten RC beams were experimentally tested in flexure under three-point loading. The reinforced concrete beams have rectangular cross sections and were strengthened by bonded CFRP strips. Flexural strength and ductility were investigated in order to reveal the impact of changing the CFRP strips’ locations with respect to the beams’ cross section. The CFRP strips were attached to the reinforced concrete beams sides of bottoms. The first configuration is thought to reduce the effect of flexure cracks in the mid-span of the beams, which may delay the deboning of these laminates. In order to anchor the strips, close to the support and eliminate end delamination, CFRP sheets were wrapped at these locations. Based on the proposed configurations, the flexure strength of the beams increased by an average of 40%.

A case study of a novel ducted composite material marine current turbine

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Jifeng Wang ◽  
Blake Gower ◽  
Norbert Müller
Keyword(s):  
Composite Material ◽  
High Strength ◽  
Numerical Approach ◽  
Filament Winding ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Current Turbine

AbstractAdvanced composite materials are widely used as marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion. A novel manufacturing approach similar to filament winding has been developed and is able to produce the Composite Material Marine Current Turbines (CMMCTs) that have significant advantages over traditional designs. This paper presents numerical results investigating the performance of ducted CMMCTs. The numerical approach was performed using CFD in a free stream of water with various hydrodynamic flow conditions. The investigation results provide an insight into the hydrodynamic design and operation of CMMCTs.

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