Study of the anti-penetration performance of concrete with different coarse aggregate content

Wu, Chih Chiang; Li, Wenbin; Shen, Xiaojun

doi:10.1590/1679-78255072

Cited by 8 publications

(3 citation statements)

References 22 publications

(22 reference statements)

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“…2c). (Wu et al, 2018) The projectiles were launched by a 30 mm smoothbore gun. The projectile produces a negligible attack angle and penetrates the target with initial velocity V0 ≈ 650 m/s.…”

Section: Experiments Proceduresmentioning

confidence: 99%

Study of cracks in concrete target under deep penetration by a projectile

Shen

et al. 2019

Lat. Am. j. solids struct.

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A large number of cracks occur in concrete structure after projectile penetration. The study of crack distribution and propagation process is the basis of damage assessment, structural repair and high dynamic fracture mechanism. In this paper, wire saw cutting, X-ray computed tomography (X-CT) and mechanical property testing of damaged concrete were carried out on deep penetration targets. According to X-CT images of radial core samples in target and the mechanical properties of damaged concrete, the crack distribution in the target was divided into a plastic damage zone and a brittle damage zone, and the microcracks only existed in the plastic damage zone. The initial growth process of three-dimensional cracks was obtained by X-CT images of axial core samples in target, that is, the cracks in the pure mortar target gradually developed from the radial direction to the tangential direction, and the target containing coarse aggregate directly formed tangential cracks. The propagation progress of cracks was obtained through the target section, that is, the tangential cracks bent in the pure mortar target, and were relatively straight in the target containing coarse aggregate. A crack propagation model was established, and the tangential crack formula and the crack propagation velocity were obtained.

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Section: Experiments Proceduresmentioning

confidence: 99%

Study of cracks in concrete target under deep penetration by a projectile

Shen

et al. 2019

Lat. Am. j. solids struct.

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“…[ 38 ] This material is especially suitable in applications where the demand for flexible action is not high but the output force is large. [ 39,40 ] For flexible grasping in soft drive research, the derived applications of typical materials, such as silica gel and hydrogel, are realized. [ 41,42 ] In a study on the stability of a series‐parallel combination of a hand‐foot quadruped robot, a simple steel structure perfectly completed the actions of single‐hand grasping and three‐foot standing.…”

Section: Source Of Bio‐inspirationmentioning

confidence: 99%

Recent Advances in Sources of Bio‐Inspiration and Materials for Robotics and Actuators

Yang

Chen

et al. 2023

Small Methods

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Bionic robotics and actuators have made dramatic advancements in structural design, material preparation, and application owing to the richness of nature and innovative material design. Appropriate and ingenious sources of bio‐inspiration can stimulate a large number of different bionic systems. After millennia of survival and evolutionary exploration, the mere existence of life confirms that nature is constantly moving in an evolutionary direction of optimization and improvement. To this end, bio‐inspired robots and actuators can be constructed for the completion of a variety of artificial design instructions and requirements. In this article, the advances in bio‐inspired materials for robotics and actuators with the sources of bio‐inspiration are reviewed. The specific sources of inspiration in bionic systems and corresponding bio‐inspired applications are summarized first. Then the basic functions of materials in bio‐inspired robots and actuators is discussed. Moreover, a principle of matching biomaterials is creatively suggested. Furthermore, the implementation of biological information extraction is discussed, and the preparation methods of bionic materials are reclassified. Finally, the challenges and potential opportunities involved in finding sources of bio‐inspiration and materials for robotics and actuators in the future is discussed.

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“…How does the DZ affect chloride diffusion in cement? The volume of CP accounts for 50–60% of RC [ 16 ]. The water–cement ratio and the degree of hydration of CP can affect the porosity, which in turn affects chloride diffusion in concrete [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Exploring Exact Effects of Various Factors on Chloride Diffusion in Cracked Concrete: ABAQUS-Based Mesoscale Simulations

Zhao

Guan

2023

Materials

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Chloride ion attack is a major cause of concrete durability problems, and existing studies have rarely addressed the effects of damage zones. In this paper, an improved mesoscale model including five phases was constructed using the finite element software ABAQUS to study the diffusivity of chloride ions in cracked concrete. It was found that the damage zone is negligible when the crack width is less than 50 μm, while the width and depth of the damage zone are about 15 times the crack width and 15% of the crack depth when the crack is greater than 50 μm. The results show that the diffusion of chloride is greatly influenced by the crack width, while it is little-influenced by the crack shape. Low water–cement ratio and adequate hydration of the concrete are also key factors affecting chloride diffusion. In contrast, regular rounded aggregates have a positive effect on reducing chloride diffusion compared to irregularly shaped aggregates, and this effect becomes weaker with increasing service time. In addition, the protective layer can effectively prevent the diffusion of chloride in concrete. Therefore, when designing marine concrete, efforts should be made to ensure that the concrete has a low water–cement ratio, adequate hydration, less cracking and a protective layer.

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Study of the anti-penetration performance of concrete with different coarse aggregate content

Cited by 8 publications

References 22 publications

Study of cracks in concrete target under deep penetration by a projectile

Study of cracks in concrete target under deep penetration by a projectile

Recent Advances in Sources of Bio‐Inspiration and Materials for Robotics and Actuators

Exploring Exact Effects of Various Factors on Chloride Diffusion in Cracked Concrete: ABAQUS-Based Mesoscale Simulations

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