Experimental and numerical investigation of lattice-walled cylindrical shell under low axial impact velocities

Hatami, Hossein; Nouri, Mohammad Damghani

doi:10.1590/1679-78251919

Cited by 18 publications

(5 citation statements)

References 16 publications

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“…3,5 Metal meshes, due to their durability and metallic properties, are another promising collecting medium that have gained great interest. The applications of metallic structures (woven, 11,12 knitted, 5,13 or expanded [14][15][16] ) are not only limited to fog collectors but also in energy absorption applications. [17][18][19] In fog collection applications, the efficiency of the collectors is influenced by the fog liquid water content, the fog droplet size distribution, the wind speed and the collector characteristics.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

Zefrehei

Sheikhzadeh

Pishevar

2022

Journal of Industrial Textiles

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Fog collectors have gained increasing attention as an efficient solution to overcome the water scarcity concerns in arid and semiarid environments. Besides the rapid advances made in various collector designs, the role of geometrical characteristics of the fog collector meshes is not fully understood. Therefore, the main objective of the present research is to address this issue and investigate the effects of textile features on the efficiency of conventional meshes which has not been discussed in previous works. The collection efficiencies of various conventional structures (plain-woven, plain-knitted, and 3-D spacer) with different characteristics (fiber diameter, fiber spacing, fiber arrangement, shading coefficient, and test direction) were investigated using a custom-made fog collecting device. The weight of collected water over time and the onset time were measured to assess the performance of different samples. Moreover, a simple simulation of a plain-woven structure was developed using Computational Fluid Dynamics (CFD) to perform further analysis. The results revealed that in the woven structure, the collection efficiency was improved by changing the shading coefficient to an optimum value and simultaneous decreasing fiber diameter. In the spacer fabrics, the position and arrangement of the spacer fibers posed considerable effects on the collection efficiency. 3-D spacer meshes showed highest value of collection efficiencies and onset time in comparison to the other examined meshes. The results of simulation of woven structures were also validated by comparing computed and measured collection efficiencies.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

Zefrehei

Sheikhzadeh

Pishevar

2022

Journal of Industrial Textiles

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“…The use of a static loading is not sufficient to predict the behaviors of cement and concrete composites against impact loading. Moreover, perforated steel sheets have high energy absorption capacity [30][31][32][33]. The combination of perforated steel sheets and self-compacting fiber concrete composites can be studied as a combined system.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

Hatami

Dalvand

Chegeni

2020

J Braz. Soc. Mech. Sci. Eng.

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Impact loadings essentially differ from static loadings due to a huge amount of the force applied to milliseconds under these loadings. Energy absorption of composites is proper criteria to examine the function against impact loading. Energy absorbers are widely used in the industry. At the same time, due to their unique properties, the use of strong self-compacting composites has been considered by the researchers. High tensile, compressive, and flexural strengths have made these concrete composites more eminent. In a comprehensive experimental work, using four basic mix designs, 64 rectangular composite panels were made with 100 mm 2 of area and 30, 45, 60, and 75 mm thickness and tested by impact loading. Compressive, tensile, and flexural strength tests were performed on all the four max designs. Steel fibers with percentages of 0, 0.25, 0.5, and 0.75 with 25 m of length were used to make the concrete composites. A hammer with 180 kg weight and 7500 J power was used as the impact loading with drop hammer test machine (DH-TM). The specimens were dynamically loaded by drop test from a 60 cm height. The use of steel fibers and expanded sheets in combination with each other significantly increases the energy absorption. Moreover, the initial peak force increases, while crushing length and deformation of the specimens reduce.

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“…They found that the tubes with zero degree angle cells had a symmetric collapse mechanism and increase in the size of the cells decreased the peak crushing force and E a capacity. Hatami and Damghani Nouri [16] presented experimental and numerical investigation of a lattice-walled cylindrical shell. In their study, the type of collapse, force–displacement diagrams, crushing length, and absorbed energy were investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of lattice core sandwich beams under low-velocity bending impact

Taghipoor

Nouri

2018

Jnl of Sandwich Structures & Materials

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The performance of sandwich beams with expanded metal sheets as core was studied under transverse impact loading. Relationships between the force and displacement at the mid-span of the sandwich beams were obtained from the experiments. Numerical simulations were carried out using ABAQUS/EXPLICT and the results were thoroughly compared with the experimental results. Then, the influence of the core layer number, cell orientation, size of the cell, and thickness of the substrates was investigated. The results showed that the increase in the core layers up to three times increased the energy absorption ( Ea) by 33.88%. Moreover, increasing the thickness by up to three times increased the Ea by 61.33%. It was found that effects of the cell size and cell orientation on the Ea were dependent on each other, governing the low-velocity impact response of the sandwich beams with lattice cores.

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Experimental and numerical investigation of lattice-walled cylindrical shell under low axial impact velocities

Cited by 18 publications

References 16 publications

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

Experimental and numerical investigation of lattice core sandwich beams under low-velocity bending impact

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