Effect of Laminate Configurations on Impact Properties of GFRP Composite in Seawater

2007 ◽  
Vol 7-8 ◽  
pp. 223-227
Author(s):  
S.K. Srivastava ◽  
I.P. Singh
Keyword(s):  
Impact Properties ◽  
Specific Strength ◽  
Reinforced Plastics ◽  
Marine Structure ◽  
Hybrid Laminates ◽  
Glass Fibre Reinforced ◽  
Important Field ◽  
Strength And Stiffness ◽  
Transfer Moulding ◽  
The Impact

Hybrid laminates of glass fibre reinforced plastics (GFRP) are being increasingly used for marine structures under multidirectional loadings, due to their anisotropic behavior, corrosion resistance, high specific strength and stiffness. Therefore appropriate laminate configuration for marine environment applications is an important field of study. Five types of fibre epoxy laminates configurations, resulting from different combinations of three layers of chopped strand mats (CSM) and woven roving (WR) were fabricated using the vacuum resin transfer moulding (VRTM) technique. These were investigated for the effect of seawater on its impact properties. The results showed a significant reduction in the impact strength in all types of wet specimens. This behavior may be attributed to penetration of water molecules in the composites. The impact properties of hybrid laminates using a mixture of CSM and WR were found to be better than combination of laminates comprising only CSM and WR under both dry and wet conditions for marine structure.

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.

Flexural properties of notched carbon–aramid hybrid composite laminates

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4137-4148 ◽  
Author(s):  
TA Sebaey ◽  
Ahmed Wagih
Keyword(s):  
Hybrid Composite ◽  
Composite Laminates ◽  
High Sensitivity ◽  
Flexural Properties ◽  
Bending Tests ◽  
Specific Strength ◽  
Four Point Bending ◽  
Hybrid Laminates ◽  
Minimal Damage ◽  
Strength And Stiffness

Hybrid composite laminates are currently receiving researchers’ attention due to their specific advantages in designing laminates with improved specific strength and stiffness. One of the main disadvantages of polymeric laminated composites is their high sensitivity to notches, which cannot be avoided in design. This paper presents a comparison between two common hybridization techniques, namely sandwich and intra-ply hybridization. The study adopts experimental observations to investigate the influence of hybridization method on the flexural properties of notched carbon–aramid hybrid laminates. After four-point bending tests, the results show that the damage nature in both laminates is different. A catastrophic damage is observed for intra-ply hybrid laminates, while sandwich laminates show progressive damage. In terms of the strength, sandwich specimens show 1.3 times higher specific strength, compared to intra-ply specimens. Moreover, the bottom layers of the laminate manufactured in the sandwich fashion show minimal damage due to the high capability of the aramid/epoxy core to absorb the energy in deformation and concentrate the damage at the top layers (the compression side).

Effect of CNT Grafting on Carbon Fibers on Impact Properties of CFRTP Laminate

2018 ◽  
Vol 774 ◽  
pp. 410-415 ◽  
Author(s):  
Kazuto Tanaka ◽  
Ken Uzumasa ◽  
Tsutao Katayama
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Interfacial Strength ◽  
Fiber Surface ◽  
Impact Properties ◽  
Specific Strength ◽  
Out Of Plane ◽  
Reinforced Thermoplastics ◽  
The Impact

Carbon fiber reinforced thermoplastics (CFRTP) are expected to be used as a structural material for aircraft and automobiles not only for their mechanical properties such as high specific strength and high specific rigidity but also for their high recyclability and short molding time. Generally, in a composite material having a laminated structure, interlaminar delamination is often caused by an out-of-plane impact, so the interlayer property plays an important role in the mechanical properties. It has been reported that the fiber/matrix interfacial strength increases by grafting carbon nanotubes (CNT) on the carbon fiber surface. In this study, CNT grafted carbon fibers were used for reinforcement of CFRTP laminate for the improvement of impact properties of CFRTP laminates. The impact absorbed energy of the CFRTP laminate using CNT grafted carbon fibers as reinforcing fiber was higher than that using untreated CF.

Influence of Hybridisation and Test Geometry on the Impact Response of Glass-Fibre-Reinforced Laminated Composites

2002 ◽  
Vol 10 (4) ◽  
pp. 259-272 ◽  
Author(s):  
Bernard Schrauwen ◽  
Pascal Bertens ◽  
Ton Peijs
Keyword(s):  
Glass Fibre ◽  
Test Set ◽  
Impact Behaviour ◽  
Impact Tests ◽  
Hybrid Laminates ◽  
Glass Fibre Reinforced ◽  
Weight Impact ◽  
Set Up ◽  
Falling Weight ◽  
The Impact

This paper describes the results of falling weight impact tests (FWITs) on glass-fibre-reinforced (GRP) laminates and E-glass/Dyneema® hybrid laminates. The test programme consisted of (i) falling weight impact tests to determine the penetration energy and (ii) experiments to determine the influence of hybrid construction on damage development and impact fatigue lifetime under repeated impact conditions at sub-penetration energy levels. The objective of this work was to investigate the effect of hybridisation on the impact behaviour of GRP laminates as well as to find optimal conditions for hybridisation. It was shown that in the case of a rigid test set-up - and hence small deflections - the influence of the Dyneema® on the impact behaviour of hybrid laminates is rather small because damage processes are the result of local contact stresses in the vicinity of the impact body, whereas in the case of a compliant test set-up and large deflections the high energy storage capacity of the ductile Dyneema® fibres is used far more effectively for the protection of hybrid composite laminates. Therefore, it was concluded that in order to fully utilise the potential of high-performance polyethylene fibres it is essential that these fibres are located on the (non-impacted) tensile side of an impacted laminate and that the geometrical test conditions are such that large (bending) deformations are allowed.

scholarly journals The influence of tensile stress on inductively coupled piezoceramic sensors embedded in fibre-reinforced plastics

2020 ◽  
pp. 147592172092616
Author(s):  
James S Chilles ◽  
Anthony Croxford ◽  
Ian P Bond
Keyword(s):  
Guided Wave ◽  
Inductively Coupled ◽  
Reinforced Plastics ◽  
Load Dependence ◽  
Wave Measurements ◽  
Ultrasonic Guided Wave ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Composites ◽  
Carbon Fibre Reinforced Plastic ◽  
The Impact

This article demonstrates that embedded piezoelectric sensors can survive loads much higher than predicted by their material properties. It shows the potential for piezoceramic sensors to estimate structural loads when embedded in composites. To show this, embedded sensors were subjected to stresses and strains which were significantly greater than the recommended operating limits of their piezoceramic constituents. A novel data acquisition method enabled ultrasonic guided wave measurements to be recorded wirelessly from the embedded transducers, key to minimising the impact of embedded transducers. The data recorded by the piezoceramic transducers exhibited a reversible load dependence, with the measurements returning to the stress-free values upon removal of the applied load. The guided wave measurements recorded by transducers embedded in glass fibre–reinforced composites showed no degradation after being subjected to tensile strains of 1.07%. When embedded in a carbon fibre–reinforced plastic sample which was loaded to failure, the transducers remained operational; however, sensor performance was shown to be degraded after being subjected to tensile stresses as high as 606 MPa. This offers the potential to build sensors to characterise overload in a component.

An Experimental Study on the Axial Collapse Characteristics of Hybrid Side Member

2006 ◽  
Vol 324-325 ◽  
pp. 411-414
Author(s):  
Kil Sung Lee ◽  
Kwang Hee Im ◽  
In Young Yang
Keyword(s):  
Energy Absorption ◽  
Collapse Mechanism ◽  
Side Member ◽  
Specific Strength ◽  
Reinforced Plastics ◽  
Collapse Characteristics ◽  
Collapse Mode ◽  
Fiber Reinforced Plastics ◽  
Strength And Stiffness ◽  
Shaped Section

The purpose of this study was to develop lightweight hat shaped section side members which absorb the most of the energy during the front-end collision of vehicle. The hybrid side member was manufactured by combination of aluminum and CFRP. An aluminum or CFRP (Carbon Fiber Reinforced Plastics) member is representative lightweight materials but its axial collapse mechanism is different from each other. The aluminum member absorbs energy by stable plastic deformation, while the CFRP member absorbs energy by unstable brittle failure with higher specific strength and stiffness than those in the aluminum member. Based on the respective collapse characteristics of CFRP side and aluminum members, the hybrid side members were tested on the axial collapse loads to get a synergy effect when the member is combined with the advantages of each members, such as energy absorption by the stable folding deformation of the aluminum member and by the high specific strength and stiffness of the CFRP member. Energy absorption capability and collapse mode of the hybrid side members were analyzed.

scholarly journals Drilling of Fibre Reinforced Plastic Laminates

2008 ◽  
Vol 587-588 ◽  
pp. 706-710 ◽  
Author(s):  
Luís Miguel P. Durão ◽  
A.G. Magalhães ◽  
António Torres Marques ◽  
A.M. Baptista ◽  
M. Figueiredo
Keyword(s):  
High Strength ◽  
Machining Process ◽  
Test Results ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Low Weight ◽  
Load Carrying ◽  
Hybrid Laminates ◽  
Sporting Goods ◽  
Strength And Stiffness

The use of fibre reinforced plastics – FRP’s – in structures is under a considerable increase. Advantages of their use are related with their low weight, high strength and stiffness. The improvement of the dynamic characteristics has been profitable for aeronautics, automobile, railway, naval and sporting goods industries. Drilling is a widely used machining technique as it is needed to assemble parts in a structure. This is a unique machining process, characterized by the existence of two different mechanisms: extrusion by the drill chisel edge and cutting by the rotating cutting lips. Drilling raises particular problems that can reduce mechanical and fatigue strength of the parts. In this work, quasi-isotropic hybrid laminates with 25% of carbon fibre reinforced plies and 4 mm thickness are produced, tested and drilled. Three different drill geometries are compared. Results considered are the interlaminar fracture toughness in Mode I – GIc –, thrust force during drilling and delamination extent after drilling. A bearing test is performed to evaluate tool influence on the load carrying capacity of the plate. Results consider the influence of drill geometry on delamination. A correlation linking plate damage to bearing test results is presented.

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.

Analysis of Laminate Configuration on Impact Properties of Glass Fibre Epoxy Nanocomposites

2012 ◽  
Vol 488-489 ◽  
pp. 686-690
Author(s):  
A. Thiagarajan ◽  
K. Palaniradja ◽  
N. Rajesh Mathivanan ◽  
M. Naresh
Keyword(s):  
Energy Absorption ◽  
Glass Fibre ◽  
Energy Levels ◽  
Testing Machine ◽  
Maximum Load ◽  
Epoxy Nanocomposites ◽  
Impact Properties ◽  
Glass Fibre Reinforced ◽  
Falling Weight ◽  
The Impact

The impact behaviors of glass fibre reinforced/epoxy nanocomposites were studied by experimental using instrumental falling weight testing machine at three different energy levels. Two types of laminates were prepared by hand lay-up method with varying nanoclay into the epoxy in a 1%, 3% and 5%, respectively. The structures of nanocomposites were studied using X-ray diffraction (XRD). It was found that the nanoclay was orderly exfoliated in the epoxy resin. The impact properties of maximum load and energy absorption were determined. It was observed that addition of 3% nanoclay into the epoxy, the maximum load was enhanced by 32% and energy absorption by 24% at the energy level of 24.89J. The impact fractured surface morphology of the glass fibre/epoxy nanocomposites was analyzed using scanning electron microscopy (SEM).

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.

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