Experimental and Numerical Study of Engineered Cementitious Composite with Strain Recovery under Impact Loading

Nehdi, Moncef L.; Ali, Mohamed A. E. M.

doi:10.3390/app9050994

Cited by 19 publications

(7 citation statements)

References 35 publications

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“…The small crack width can resist the migration of chlorides and other corrosive agents, and thus improve the durability of the materials [45]. Nehdi and Mohamed [46] proposed a novel hybrid ECC reinforced with short shape memory alloy (SMA) fibers and polyvinyl alcohol (PVA) fibers, and studied its impact response experimentally and numerically. Because of the shape memory effect of SMA fibers, the energy absorption capability of ECC increased after heat treatment, which is different from ordinary cementitious materials.…”

Section: Properties Of Eccmentioning

confidence: 99%

Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Shang

et al. 2019

Sustainability

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This paper presents a review of the recent work assessing the performance of building structures strengthened with engineered cementitious composite (ECC). ECC characterizes tensile strain hardening and multiple cracking properties, as well as strong interfacial bonding performance with substrate concrete, which makes it a promising retrofitting material. A lot of researches have been conducted on reinforced concrete (RC) structures, including beams, columns, beam–column joints, and fire-damaged slabs, strengthened with ECC material, and an extensive collection of valuable conclusions were obtained. These strengthening systems usually combine ECC with FRP textiles or steel bars to form a composite strengthening layer. The review demonstrates that ECC strengthening can greatly improve the performance of RC structures.

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Section: Properties Of Eccmentioning

confidence: 99%

Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Shang

et al. 2019

Sustainability

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“…Visualization of pressure contours available during the post-processing stage allows for a better understanding of complex process of shock wave interaction with the ground. Figure 5 shows the pressure contours at different moments, which reappears in the interaction process between the shock wave and the rigid ground [48]. Different images represent typical propagation moments of shock wave, and different pressure values are represented by different colors.…”

Section: Propagation Law Of the Shock Wave Above Rigid Groundmentioning

confidence: 99%

Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Wang

Cui

et al. 2019

Applied Sciences

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A massive explosion of a liquid-propellant rocket in the course of an accident can lead to a truly catastrophic event, which would threaten the safety of personnel and facilities around the launch site. In order to study the propagation of near-ground shock wave and quantify the enhancement effect on the overpressure, models with different grounds have been established based on an explicit nonlinear dynamic ANSYS/LS-DYNA 970 program. Results show that the existence of the ground will change the propagation law and conform to the reflection law of the shock wave. Rigid ground absorbs no energy and reflects all of it, while concrete ground absorbs and reflects some of the energy, respectively. Ground may influence the pressure-time curve of the shock wave. When the gauge is close to the explosive, the pressure-time curve presents a bimodal feature, while when the gauge reaches a certain distance to the explosive, it presents a single-peak feature. For gauges at different heights, different grounds may have different effects on the peak overpressure. For gauges of height not greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is small. On the contrary, as for the gauges of height greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is big. Ground has the enhancement effect on peak overpressure, but different grounds have different ways. For rigid ground, the peak overpressure factor is about 2. However, for the concrete and soil ground, peak overpressure factor is from 1.43 to 2.1.

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“…Take the stage-3 rocket explosion as an example to illustrate this problem. Figure 6 shows the strain contours at different moments of stage-3 explosion, reappearing rocket damage process under the action of air blast wave after the explosion [38]. A strong chemical reaction takes place after detonation, resulting in a sharp expansion and diffusion in all directions of the high temperature and high-pressure explosive products, and the blast wave propagates outward in the form of a spherical wave.…”

Section: Analysis For Propagation Lawof Blast Wavementioning

confidence: 99%

Prediction Method of Blast Wave Impact on Crew Module for Liquid Rocket Explosion on Launch Pad

Wang

Cui

et al. 2019

Applied Sciences

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The role of manned space flight in the field of space exploration and utilization is growing. However, the security system of the manned spaceflight is still imperfect. In the case that the rocket explodes, crew modules maybe damaged by the blast wave, which will threaten the safety of the crews. This research aims to obtain the necessary data and information to enable the designers of the launch vehicles and crew modules to develop safer launch systems. To this end, this paper proposes a numerical method using LS-DYNA to study the propagation law of blast waves caused by rocket explosion on the launch pad and to quantify the impact of the blast wave on crew module. The numerical results indicate that the final blast waveform of the model with rocket is conical in the upper and lower parts, and spherical in the middle. At the same time, the third-stage explosion is the most harmful to the crew module, while the first-stage explosion is the least. Furthermore, the model with rocket has a marked effect on explosion strength: the pressure enhancement factor is about 4–17 times. Most importantly, overpressure prediction formula acting on the crew modulesof explosion on the launch pad is established for quick peak overpressure predicting and damage evaluating.

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Experimental and Numerical Study of Engineered Cementitious Composite with Strain Recovery under Impact Loading

Cited by 19 publications

References 35 publications

Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Prediction Method of Blast Wave Impact on Crew Module for Liquid Rocket Explosion on Launch Pad

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