Energy absorption of composite materials (original) (raw)
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Crashworthiness Characteristics and Failure Mode of Composite Tubes
International Journal of Innovative Technology and Exploring Engineering, 2020
The woven plain weave/epoxy hexagonal tubes’ capacity for energy absorption is investigated in present work. The experimental work was performed on composite hexagons with different hexagonal angles between 35° and 55° in aspect ratios L/t = 70 and 10° angular increments. Observation was made on how the configuration impacts the crash-worthiness behavior of the reinforced hexagonal tubes. Moreover, the impact on absorbed energy was also investigated. The highest energy absorption capability and average crashing load was demonstrated by the woven plain weave/epoxy hexagonal tube with β = 45°. Failure of the woven plain weave/epoxy hexagonal tube was found to be in progressive mode. Furthermore, apart from the influence of geometry, the energy absorption capabilities of the hexagonal tubes were also affected by the type of material.
The effect of processing conditions on the energy absorption capability of composite tubes
Composite Structures, 2008
Structures capable of absorbing large amounts of energy are of great interest, particularly in the automotive and aviation industries, in an effort to reduce the impact on passengers in the case of a collision. The energy absorption properties of composite materials can be tailored, thus making them an appealing option as a substitute of more traditional materials in applications where energy absorption is crucial. In this research, the effect of the processing conditions (with or without vacuum) on the specific energy absorption capacity of composite tubes was investigated. Tubes of circular and square cross sections were fabricated using orthophthalic polyester resin and plain weave E-glass fabric with fibers oriented at 0°/90°, with respect to the tube axis. Test specimens consisting of tube segments were prepared and tested under quasi-static compression load. Test results indicate that, among the conditions considered, tubes of circular cross section fabricated under applied vacuum display the highest level of specific energy absorbed. Ultimately, this investigation demonstrates the potential for tailoring the energy absorption properties of composite materials through controlled processing conditions.
Effect of composite material distribution and shape on energy absorption systems
Advances in Materials and Processing Technologies, 2020
This paper presents the geometry and material distribution influence on energy absorption systems and failure mode of glass epoxy tubes and carbon epoxy tubes in order to improve the structural performances. Experiments were carried out on different types of composite tubes subjected to axial compression load. After collecting the results of the crushing and drawing the load-displacement curve, the initial failure load, maximum crushing load and average load were found. From these parameters, the crashworthiness parameters were calculated. The comparison results between the parameters showed that the best structure of the glass epoxy tubes was the circular tube with eight layers, where produced the highest specific energy absorption at a value of 21.23 kJ/kg.
Strain Rate Effects on the Energy Absorption of Rapidly Manufactured Composite Tubes
Journal of Composite Materials, 2009
As a result of recent increases in fuel prices and the growing number of accident fatalities, the two major concerns of the automotive industry and their customers are now occupant safety and fuel economy [1,. Increasing the amount of energy and optimizing the manner in which energy is absorbed within vehicle crush zones can improve occupant survivability in the event of a crash, while fuel economy is improved through a reduction in weight.
An experiment study of fiberglass (E-400) composite tubes subjected to quasi-static compression loading is presented. The main objective of this study is to increase the understanding of the behavior of deformation and failure mode of composite tubes under axial loading. Three different types of shapes had been selected; which are circular, triangular and square. These composite tubes have been fabricated with 4, 6, 8 and 10 layers, using 0/90° fiber orientation angle. The tubes inner diameter is 100mm and the height is 100mm for all the specimens. The results had been observed including the experimental results of the load-displacement curves, the initial failure load, the maximum failure load and the average failure load. From these results, the crashworthiness parameters were calculated. It was found that the initial failure load and the total energy absorption are increasing when the number of layers increased for the specimen at the same condition.
Polymer Composites, 2019
The efficacy of woven jute-polyester (JP) composite tubes as structural energyabsorbing countermeasures has been explored in the current study. In this connection, the behaviors of 3-ply and 4-ply JP composite tubes of square and double-hat shaped sections subjected to axial quasi-static and impact loads are considered, and compared with 4-ply glass-polyester (GP) tubes of similar geometric configurations. Initially, basic mechanical characterization of JP laminates is carried out using a Universal Testing Machine, which is followed up with axial quasi-static and drop-weight impact testing of JP tubes, along with similar tests carried out on GP tubes. A thorough comparison is made between the performances including failure patterns of JP and GP components under axial loading using metrics such as peak load, mean crush load, absorbed energy, and specific energy absorption (SEA). As many structural applications involve dynamic bending loads, a comparative study is carried out between double-hat JP and GP components subjected to transverse impact loading. Based on the competitive values of mean load and SEA yielded by jutecomposite tubes in the present study for axial impact loading, and high mean load and moderate energy absorption till failure recorded by similar components under three-point impact bending, it can be concluded that JP tubes can be capable of supporting impact loads under both axial and bending modes.
Effect of Test Velocity on the Energy Absorption Under Progressive Crushing of Composite Tubes
Advances in Science and Technology Research Journal, 2020
The paper presents the results of the compression tests for carbon-epoxy composites in order to assess the amount of energy absorbed depending on the process velocity and content of axial fibres. Two types of prepreg (UD 200 g/m 2 and woven 160 g/m 2) were used to prepare the specimens with a diameter of 20 mm and a height of 34 mm. The specimens were subjected to compression under various speed conditions (static, dynamic and SHPB tests). The calculated specific energy absorption values showed a 50-60% decrease with increasing process velocity and depending on the type of specimens architecture. The highest energy values were absorbed by the specimens with the highest share of axial fibres in the sample.
2020
The paper presents the results of the compression tests for carbon-epoxy composites in order to assess the amount of energy absorbed depending on the process velocity and content of axial fibres. Two types of prepreg (UD 200 g/m2 and woven 160 g/m2) were used to prepare the specimens with a diameter of 20 mm and a height of 34 mm. The specimens were subjected to compression under various speed conditions (static, dynamic and SHPB tests). The calculated specific energy absorption values showed a 50–60% decrease with increasing process velocity and depending on the type of specimens architecture. The highest energy values were absorbed by the specimens with the highest share of axial fibres in the sample.
Effect of Fiber Orientation Angle on the Energy Absorption Characteristics of Composite Tubes
Engineering and Technology Journal
The purpose of the paper is to present a study of the effect of the ply orientation angle on the crushing behavior, energy absorption, specific energy absorption, and failure mode of woven glass fiber/polyester laminated composite tube. Glasspolyester tubular specimens with circular cross-sectional geometry and (+45˚/-45˚, +60°/-30°, 0°/90°) fiber orientation angles were fabricated and crushed by quasistatic test under the same condition to examine the energy absorption characteristics and to calculate the crashworthiness parameters. The loaddisplacement curves of the tested tubes were presented and described; several failure modes of the crushed tubes were observed and discussed. It has been found that the fiber orientation angle has a considerable effect on the crushing characteristic of the collapsed tubes and the failure mode, and (0°/90°) fiber orientation angle tubes exhibit the highest SEA (specific energy absorption) 33.108 kJ/kg, crush force efficiency (0.7), crush strain relation (0.81) and a load/deformation curve closer to the ideal curve than the other specimens.