Evaluation of Bending Test Methods for Composite Materials

Flexible electronics is a rapidly growing technology for a multitude of applications. Wearables and flexible displays are some application examples. Various technologies and processes are used to produce flexible electronics. An important aspect to be considered when developing these systems is their reliability, especially with regard to repeated bending. In this paper, the frequently used methods for investigating the bending reliability of flexible electronics are presented. This is done to provide an overview of the types of tests that can be performed to investigate the bending reliability. Furthermore, it is shown which devices are developed and optimized to gain more knowledge about the behavior of flexible systems under bending. Both static and dynamic bending test methods are presented.

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Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Materials ◽

10.3390/ma11112118 ◽

2018 ◽

Vol 11 (11) ◽

pp. 2118 ◽

Cited By ~ 8

Author(s):

Marek Pszczola ◽

Cezary Szydlowski

Keyword(s):

Tensile Strength ◽

Low Temperature ◽

Cooling Rate ◽

Strength Properties ◽

Test Methods ◽

Asphalt Mixtures ◽

Bending Test ◽

Mixture Composition ◽

Tension Stress ◽

Strength Reserve

In regions with low-temperatures, action transverse cracks can appear in asphalt pavements as a result of thermal stresses that exceed the fracture strength of materials used in asphalt layers. To better understand thermal cracking phenomenon, strength properties of different asphalt mixtures were investigated. Four test methods were used to assess the influence of bitumen type and mixture composition on tensile strength properties of asphalt mixtures: tensile strength was measured using the thermal stress restrained specimen test (TSRST) and the uniaxial tension stress test (UTST), flexural strength was measured using the bending beam test (BBT), and fracture toughness was measured using the semi-circular bending test (SCB). The strength reserve behavior of tested asphalt mixtures was assessed as well. The influence of cooling rate on the strength reserve was investigated and correlations between results from different test methods were also analyzed and discussed. It was observed that the type of bitumen was a factor of crucial importance to low-temperature properties of the tested asphalt concretes. This conclusion was valid for all test methods that were used. It was also observed that the level of cooling rate influenced the strength reserve and, in consequence, resistance to low-temperature cracking. It was concluded that reasonably good correlations were observed between strength results for the UTST, BBT, and SCB test methods.

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Experimental investigation of bending characteristics of hybrid composites fabricated by hand layup method

Journal of Physics Conference Series ◽

10.1088/1742-6596/2089/1/012033 ◽

2021 ◽

Vol 2089 (1) ◽

pp. 012033

Author(s):

M Sadashiva ◽

S Praveen Kumar ◽

M K Yathish ◽

V T Satish ◽

MR Srinivasa ◽

...

Keyword(s):

Composite Materials ◽

Hybrid Composite ◽

Polyester Resin ◽

Hybrid Composites ◽

Bending Test ◽

Environment Friendly ◽

Longitudinal Fiber ◽

Develop Environment ◽

The One ◽

Better Than

Abstract The extensive applications of hybrid composite materials in the field of transportation and structural domine provide prominent advantages in the order of stiffness, strength even cost. However extend the advantages of hybrid campsites in several field such as aviation and marine even more additional properties should be inculcate in them. During production of such profitable composites poses some problems at time at decompose and processing. It’s better to develop environment friendly and reusable composites, bio hybrid composite materials such of the one. In this paper, focused on development of Eco-friendly hybrid bio composites with the ingredients of drumstick fibers, glass fiber along with polyester resin. This hybrid bio composites subjected to bending test and evaluate the characteristics of bending properties, this research evident that bending characteristics of hybrid composites with longitudinal fiber orientation better than transverse.

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The Use of Interfacial Test Methods in Composite Materials Development

Fiber, Matrix, and Interface Properties ◽

10.1520/stp38224s ◽

2009 ◽

pp. 34-34-13 ◽

Cited By ~ 4

Author(s):

MJ Pitkethly

Keyword(s):

Composite Materials ◽

Test Methods ◽

Materials Development

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Effect of introduction of fullerene soot on mechanical properties of unidirectional thermoplastic tape

MATEC Web of Conferences ◽

10.1051/matecconf/201824504011 ◽

2018 ◽

Vol 245 ◽

pp. 04011 ◽

Cited By ~ 1

Author(s):

Ilya Kobykhno ◽

Dmytro Honcharenko ◽

Vladimir Yadykin ◽

Oleg Stolyarov ◽

Oleg Tolochko

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Carbon Fibers ◽

Modulus Of Elasticity ◽

Hot Pressing ◽

Bending Test ◽

Transverse Reinforcement ◽

Fullerene Soot

A series of unidirectional thermoplastic tapes (UD tapes) specimens based on carbon fibers and polyamide filled with fullerene soot in a concentration of up to 4 wt. % was made. From the obtained tapes by the method of hot pressing, composite materials (CM) specimens with 0/0 and 90/90 ply orientations were made. A study of the mechanical properties of the samples obtained by the 3-point bending test was made. Shown that the introduction of fullerene soot up to 2 wt. % can significantly increase the strength and modulus of elasticity of both longitudinal and transverse reinforcement directions. Further increase in the concentration of soot leads to a decrease in properties. A theory that describes the effect of fullerene soot on the properties of CM, including the increase and further decrease in properties, depending on the concentration of nanoparticles was proposed.

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