scholarly journals The Effects of Water and Seawater on the Mechanical Properties of Carbon Fibre Reinforced Epoxy Composite under Pre-Cure Curing Condition

1998 ◽  
Vol 7 (4) ◽  
pp. 096369359800700
Author(s):  
M. Zhang ◽  
S.E. Mason
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Carbon Fibre ◽  
Laminate Composite ◽  
Mechanical Performance ◽  
Epoxy Composite ◽  
Interlaminar Fracture Toughness ◽  
Curing Condition ◽  
Structural Carbon

The influences on the interlaminar fracture toughness (GIC) and ultimate tensile strength (UTS) of a cured structural carbon fibre reinforced epoxy composite of two contaminants, water and seawater, introduced prior to cure have been investigated. The results have demonstrated that the control of environmental factors such as water and seawater can have significant effects on the mechanical performance of laminate composite components during the manufacturing process.

scholarly journals Interlaminar Shear Strength of Carbon Fibre Reinforced Epoxy Composite under the Influence of Environments

1998 ◽  
Vol 7 (1) ◽  
pp. 096369359800700
Author(s):  
M. Zhang ◽  
S.E. Mason
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Laminate Composite ◽  
Mechanical Performance ◽  
Epoxy Composite ◽  
Interlaminar Shear Strength ◽  
Curing Conditions ◽  
Interlaminar Shear ◽  
Structural Carbon ◽  
Careful Comparison

The influences of contamination, using a range of contaminants introduced under postcure and pre-cure curing conditions, on the interlaminar shear strength (ILSS) of a cured structural carbon fibre reinforced epoxy composite have been investigated. A careful comparison between the post-cure and pre-cure conditions subjected to the different type of contaminants (water, seawater, acid, alkali and organic) confirmed a definite reduction in the ILSS properties. The results demonstrate that the control of environmental factors such as water, acids, alkalis, salts and organic solvents can have significant effects on the mechanical performance of laminate composite components during the manufacturing process and usage.

Effect of reactive and non-reactive diluents on thermal and mechanical properties of epoxy resin

2017 ◽  
Vol 30 (10) ◽  
pp. 1159-1168 ◽  
Author(s):  
Animesh Sinha ◽  
Nazrul Islam Khan ◽  
Subhankar Das ◽  
Jiawei Zhang ◽  
Sudipta Halder
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Epoxy Resin ◽  
Mechanical Performance ◽  
Thermal And Mechanical Properties ◽  
Minor Variation ◽  
Reactive Diluents

The effect of reactive (polyethylene glycol) and non-reactive (toluene) diluents on thermal and mechanical properties (tensile strength, hardness and fracture toughness) of diglycidyl ether of bisphenol A epoxy resin (cured by triethylenetetramine) was investigated. The thermal stability and mechanical properties of the epoxy resin modified with reactive and non-reactive diluents at different wt% were investigated using thermo-gravimetric analyser, tensile test, hardness test and single-edge-notched bend test. A minor variation in thermal stability was observed for epoxy resin after addition of polyethylene glycol and toluene at 0.5 wt%; however, further addition of reactive and non-reactive diluents diminished the thermal stability. The addition of 10 wt% of polyethylene glycol in epoxy resin significantly enhances the tensile strength (∼12%), hardness (∼14%) and fracture toughness (∼24%) when compared to that of neat epoxy resin. In contrast, major drop in mechanical performance was observed after addition of toluene in epoxy. Furthermore, fracture surfaces were investigated under field emission scanning electron microscope to elucidate the failure mechanism.

scholarly journals Tailoring the Mechanical Performance of Epoxy Resin by Various Nanoparticles

2008 ◽  
Vol 16 (8) ◽  
pp. 527-533 ◽  
Author(s):  
Sheng Liu ◽  
Hui Zhang ◽  
Zhong Zhang ◽  
Taihua Zhang ◽  
Stephan Sprenger
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Epoxy Resin ◽  
Silica Nanoparticles ◽  
Mechanical Performance ◽  
Sol Gel ◽  
Nanoparticle Dispersion ◽  
Nanosilica Particles ◽  
The Cost

Flexible organic elastomeric nanoparticles (ENP) and two kinds of rigid inorganic silica nanoparticles were dispersed respectively into a bisphenol-A epoxy resin in order to tailor and compare the performance of mechanical properties. It was found that the well-dispersed flexible ENP greatly enhanced the toughness of the epoxy with the cost of modulus and strength. Comparatively, the rigid silica nanoparticles improved Young's modulus, tensile strength and fracture toughness simultaneously. Both fumed and sol-gel-formed nanosilica particles conducted similar results in reinforcing the epoxy resin, although the latter exhibited almost perfect nanoparticle dispersion in matrix. The toughening mechanisms of nanocomposites were further discussed based on fractographic analysis.

scholarly journals Correlation between Microstructure and Mechanical Properties of Heat-Treated Ti–6Al–4V with Fe Alloying

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 854 ◽  
Author(s):  
Yongwei Liu ◽  
Fuwen Chen ◽  
Guanglong Xu ◽  
Yuwen Cui ◽  
Hui Chang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Phase Interface ◽  
High Strength ◽  
High Plasticity ◽  
High Aging Temperature ◽  
Microstructure And Mechanical Properties

The microstructure and mechanical properties of a newly developed Fe-microalloyed Ti–6Al–4V titanium alloy were investigated after different heat treatments. The volume fraction and the morphological features of the lamellar α phase had significant effects on the alloy’s mechanical performance. A dataset showing the relationship between microstructural features and tensile strength, elongation, and fracture toughness was developed. A high aging temperature resulted in high plasticity and fracture toughness, but relatively low strength. The high strength favored the fine α and the slender β. The high aspect ratio of lamellar α led to high strength but low fracture toughness. The alloy with ~84 vol % α exhibited the highest strength and lowest fracture toughness because the area of its α/β-phase interface was the highest. Optimal comprehensive mechanical performance and heat-treatment procedures were thus obtained from the dataset. Optimal tensile strength, yield strength, elongation, and fracture toughness were 999 and 919 MPa, 10.4%, and 94.4 MPa·m1/2, respectively.

Development of Epoxy Composite Filled with Micro Tungsten Disulphide Particles and its Mechanical Properties

2014 ◽  
Vol 875-877 ◽  
pp. 288-294 ◽  
Author(s):  
J.S. Sidhu ◽  
G.S. Lathkar ◽  
S.B. Sharma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Bisphenol A ◽  
Composite System ◽  
Mechanical Performance ◽  
Filler Content ◽  
Epoxy Composite ◽  
Filler Concentration ◽  
Tungsten Disulphide ◽  
Research Article

The aim of this research article is to discuss the mechanical performance of WS2-Epoxy composite with varying % vol.of WS2. Studies were carried out with epoxy (ARL136+ AH-126) composite system consisting of Tungsten disulphide (WS2) as filler. The samples tested consist of bisphenol-A based epoxy liquid resin and Lapox AH-126 hardener with varying tungsten disulphide (WS2). Appropriately cured samples gave excellent mechanical properties. Results showed that the tensile strength of the composites increased with increase in filler content for the range of filler contents (2.5-4 % vol.) and decreased with increase in the filler contents 5% vol. onwards. The result indicated that at 3% of filler concentration the tensile strength obtained is good with moderate density and hardness.

scholarly journals Modification of Carbon Fibre/Epoxy Composites by Polyvinyl Alcohol (PVA) Based Electrospun Nanofibres

2016 ◽  
Vol 25 (3) ◽  
pp. 096369351602500 ◽  
Author(s):  
Bertan Beylergi̇l ◽  
Metin Tanoğlu ◽  
Engin Aktaş
Keyword(s):  
Fracture Toughness ◽  
Polyvinyl Alcohol ◽  
Carbon Fibre ◽  
Composite Laminates ◽  
Mechanical Performance ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Mode I ◽  
Mode I Fracture Toughness ◽  
Electrospun Nanofibres

In this study, the effects of modifying interlaminar region of unidirectional carbon fibre/epoxy composites by the incorporation of electrospun polyvinyl alcohol (PVA) nanofibres were investigated. PVA nanofibres were directly deposited onto the carbon fabrics by electrospinning method to improve mechanical performance of those composites. The features of the electrospun nanofibres were characterized by microscopy techniques. The unidirectional carbon fibre/epoxy composite laminates with/without PVA nanofibre interlayers were manufactured by vacuum-infusion technique in a [0]4 configuration. Tensile, three-point bending, compression, Charpy-impact and Mode-I fracture toughness tests (Double Cantilever Beam (DCB)) were carried out in accordance with ASTM standards to evaluate mechanical performance of the composites. Scanning electron microscopy (SEM) observations were made on the specimens to evaluate microstructural features. It was observed that the carbon fabrics were successfully coated with a thin layer of PVA nanofibres by electrospinning technique. The results showed that PVA nanofibres improve the mechanical properties of unidirectional carbon/epoxy composite laminates when subjected to in-plane loading. On the other hand, PVA nanofibres slightly reduced the mode-I fracture toughness values although they led to more stable crack propagation.

Damage development in woven carbon fibre thermoplastic laminates with PPS and PEEK matrices: A comparative study

2016 ◽  
Vol 51 (5) ◽  
pp. 637-647 ◽  
Author(s):  
Sergey G Ivanov ◽  
Dries Beyens ◽  
Larissa Gorbatikh ◽  
Stepan V Lomov
Keyword(s):  
Fracture Toughness ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Textile Composites ◽  
Interlaminar Fracture Toughness ◽  
Carbon Fabric ◽  
Interlaminar Fracture ◽  
Peek Composite ◽  
The Matrix ◽  
Carbon Fibre Composites

In this work, we investigate the effect of the matrix on the mechanical performance of woven carbon fibre composites. More specifically, composites with the same 5-harness satin carbon fabric reinforcement and different thermoplastic matrices, PPS and PEEK, are compared in various mechanical tests (tensile, interlaminar fracture toughness and compression-after-impact tests). The results of tension tests show the influence of the matrix type on the development of cracks in yarns. The cracks in carbon fabric/PEEK composite appear later than in carbon fabric/PPS composite. Their density is also lower. A correlation between cumulative acoustic emission energy and transverse crack appearance in tensile tests is shown. The most evident difference is demonstrated for the Double Cantilever Beam tests and End Notch Flexure tests. The interlaminar fracture toughness for both mode I and mode II is more than 1.5 times higher for carbon fabric/PEEK laminates as compared to carbon fabric/PPS ones. The higher fracture toughness of carbon fabric/PEEK results in its higher residual compressive strength after impact (∼25%). Thus, the study concludes that the performance of textile composites is highly sensitive to the performance of the matrix. Matrices that have higher strength, ductility and fracture toughness lead to structural composites with lower crack densities, better performance in the bias direction, higher resistance to delaminations and higher residual strength after impact.

KAISER ALUMINUM ALLOY 7050

Alloy Digest ◽  
2000 ◽  
Vol 49 (1) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Heat Treating ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Kaiser Aluminum ◽  
Structural Parts ◽  
Very High

Abstract Kaiser Aluminum Alloy 7050 has very high mechanical properties including tensile strength, high fracture toughness, and a high resistance to exfoliation and stress-corrosion cracking. The alloy is typically used in aircraft structural parts. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fracture toughness and fatigue. It also includes information on forming, heat treating, machining, and joining. Filing Code: AL-366. Producer or source: Tennalum, A Division of Kaiser Aluminum.

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