Mechanical strength retention and service life of Kevlar fiber woven mat reinforced epoxy laminated composites for structural applications

2021 ◽  
Author(s):  
T. P. Sathishkumar ◽  
S. Muralidharan ◽  
S. Ramakrishnan ◽  
M. R. Sanjay ◽  
Suchart Siengchin
Keyword(s):  
Service Life ◽  
Mechanical Strength ◽  
Laminated Composites ◽  
Kevlar Fiber ◽  
Structural Applications ◽  
Strength Retention

Preparation Techniques and Property Evaluations of Highly Air Permeable Needle-Punched Geotextiles

2015 ◽  
Vol 749 ◽  
pp. 278-281
Author(s):  
Jia Horng Lin ◽  
Jing Chzi Hsieh ◽  
Jin Mao Chen ◽  
Wen Hao Hsing ◽  
Hsueh Jen Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Service Life ◽  
Mechanical Strength ◽  
Pore Structure ◽  
Test Results ◽  
Needle Punching ◽  
Pet Fibers ◽  
Environmental Requirements ◽  
Preparation Techniques

Geotextiles are made of polymers, and their conjunction with different processes and materials can provide geotextiles with desirable characteristics and functions, such as filtration, separation, and drainage, and thereby meets the environmental requirements. Chemical resistant and mechanical strong polymers, including polyester (PET) and polypropylene (PP), are thus used to prolong the service life of the products made by such materials. This study proposes highly air permeable geotextiles that are made with different thicknesses and various needle punching speeds, and the influences of these two variables over the pore structure and mechanical properties are then examined. PET fibers, PP fibers, and recycled Kevlar fibers are blended, followed by being needle punched with differing spaces and speeds to form geotextiles with various thicknesses and porosities. The textiles are then evaluated for their mechanical strength and porosity. The test results show that a thickness of 4.5 cm and 1.5 cm demonstrate an influence on the tensile strength of the geotextiles, which is ascribed to the webs that are incompletely needle punched. However, the excessive needle punching speed corresponding to a thickness of 0.2 cm results in a decrease in tensile strength, but there is also an increase in the porosity of the geotextiles.

Preparation and Study of Flexural Strength and Impact Strength for Hybrid Composite Materials used in Structural Applications

2020 ◽  
Vol 38 (8A) ◽  
pp. 1117-1125
Author(s):  
Teeb A. Mohameed ◽  
Sihama I. Salih ◽  
Wafaa M. Salih
Keyword(s):  
Fracture Toughness ◽  
Impact Strength ◽  
Flexural Strength ◽  
Polymer Blends ◽  
Laminar Composite ◽  
Kevlar Fiber ◽  
Laminar Composites ◽  
Structural Applications ◽  
Materials Used ◽  
The Impact

 Many of the polymeric materials used for structural purposes have weak mechanical properties, these characteristics can therefore be improved by preparing a hybrid laminar composite. In this work use melting mixing method using screw extruder to prepare sheets of polymer blends and nanocomposites based on polymer blends, and using a hot hydraulic press machine to prepared hybrid laminates composites. Two groups of hybrid laminar composites were prepared, the first group is consist of [((94%PP: 5%PMMA: 1 %( PP-g-MA)): 0.3% ZrO2): 6%KF and 8%KF] and the second group is [((94%PP: 5%UHMWPE: 1 %( PP-g-MA)): 0.3% ZrO2): 6%KF and 8%KF]. The results illustrated the impact strength and fracture toughness are increase with increased weight percentage of Kevlar fiber in for both groups of laminar composites and the highest values for two groups are (58.1, 54.95 KJ/M2) and (8.4, 9.16 MPa√m) respectively, any that, at the rate of increment reached to (120.4%, 107%) and (52.7%, 66.5%) respectively, compared with the neat PP. Moreover, the flexural strength values of the first group samples of hybrid laminar composite remained constant, when added kevlar fiber to nanocomposite. While, the flexural strength values of the second group samples of hybrid laminar composite increase with increase the ratio of kevlar fiber in composite to reach the maximum values (92 MPa) at 8% wt. of kevlar fiber, any, at the rate of increment reached to 39.4% compared with the neat PP. As well as, the results shown that the flexural properties and fracture toughness of the second group samples higher than they are for the first group samples.

AW DYNALLOY 50

Alloy Digest ◽  
1966 ◽  
Vol 15 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Mechanical Strength ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Low Alloy Steel ◽  
Steel Company ◽  
High Mechanical Strength ◽  
Weight Saving ◽  
Structural Applications

Abstract AW DYNALLOY 50 is a high strength low alloy steel which offers high mechanical strength together with good forming properties and weldability. It is recommended where improved strength or weight saving is desired in structural applications. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-203. Producer or source: Alan Wood Steel Company.

Study of mode II interlaminar fracture toughness of laminated composites of glass and jute fibres in epoxy for structural applications

2021 ◽  
Vol 3 (4) ◽  
pp. 044002
Author(s):  
Pankaj Singh Chandel ◽  
Y K Tyagi ◽  
Kanishk Jha ◽  
Rajeev Kumar ◽  
Shubham Sharma ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Laminated Composites ◽  
Curing Temperature ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Three Point Bending ◽  
Glass Fibres ◽  
Structural Applications ◽  
Delamination Resistance

Abstract Composites are being used in the place of metals in many industries as they have a lower density and are cheaper than metals. In aerospace industries there is requirement for light weight together with strength, and reinforced fibre composites are superior in some critical properties compared with metals. In this study, laminated composites were fabricated with woven E-glass and jute fibres in an epoxy matrix by a hand layup method. The samples were prepared as per the relevant the America Society for Testing ad Materials (ASTM) standard and tested for mode II interlaminar fracture toughness to investigate delamination resistance. Mode II interlaminar fracture toughness was evaluated by an end-notched flexure test using three-point bending. The fracture toughness G IIC was calculated for a curing temperature range from 40 °C to 70 °C at intervals of 5 °C for different sets of laminated composites. The investigations revealed that when the curing temperature of laminated composites was increased from 40 °C to 70 °C, the interlaminar fracture toughness G IIC was increased in neat woven E-glass laminated composites, decreased in neat jute laminated composites, significantly increased in laminated composites with woven E-glass fibres in compression and jute fibres in tension and slightly increased when woven E-glass fibres were kept in tension and jute fibres in compression.

Multi-Functional Metal/Ceramic Hybrid Composites for Structural Applications

2012 ◽  
Vol 706-709 ◽  
pp. 1984-1989 ◽  
Author(s):  
Makoto Nanko ◽  
Daisuke Maruoka ◽  
Nguyen Dang Thuy
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Hybrid Composites ◽  
Crack Healing ◽  
Air Oxidation ◽  
Temperature Oxidation ◽  
Outward Diffusion ◽  
Structural Applications ◽  
Metal Ceramic ◽  
Crack Repair

Some ceramic based hybrid composites with metallic particles have excellent mechanical properties. In particular, metal/ceramic nanocomposites has high mechanical strength and improved fracture toughness. Magnetized hybrid composites can be produced by dispersing Fe, Co or Ni nanoparticle in the structural ceramics. Crack healing of metal/ceramic hybrid composites was investigated for structural applications. Cracks of nanoNi/Al2O3 introduced by the Vickers indentation of 49 N could be repaired completely, for example, by air oxidation at 1200°C for 6 h. Even larger cracks introduced by 490 N indentation was healed up to a comparable level of mechanical strength by oxidation at 1200°C for 24 h in air. Outward diffusion of cations during high-temperature oxidation would cause crack repair by filling with an oxidation product. Faster crack disappearance, 900°C for 1 h, was realized on Mo/Al2O3. Surface crack healing effectiveness promoted by outward diffusion of cations is potentially applied into various Al2O3 based hybrid material systems, as well as excellent mechanical properties.

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