Mechanical Behavior of Hydraulic Concrete to Extreme Service Temperatures: The Influence of the Particle Size

2018 ◽  
pp. 294-305
Author(s):  
Kenouza Yamina
Keyword(s):  
Particle Size ◽  
Mechanical Behavior ◽  
Hydraulic Concrete

scholarly journals SIMULATION OF FRACTURE USING A MESH-DEPENDENT FRACTURE CRITERION IN THE DISCRETE ELEMENT METHOD

2018 ◽  
Vol 16 (1) ◽  
pp. 41 ◽  
Author(s):  
Andrey Dimaki ◽  
Evgeny Shilko ◽  
Sergey Psakhie ◽  
Valentin Popov
Keyword(s):  
Particle Size ◽  
Discrete Element Method ◽  
Mechanical Behavior ◽  
Fracture Criterion ◽  
Discrete Element ◽  
Macroscopic Behavior ◽  
Detachment Criterion ◽  
Discrete Element Methods ◽  
Adhesive Contacts ◽  
Fracture Processes

Recently, Pohrt and Popov have shown that for simulation of adhesive contacts a mesh dependent detachment criterion must be used to obtain the mesh-independent macroscopic behavior of the system. The same principle should be also applicable for the simulation of fracture processes in any method using finite discretization. In particular, in the Discrete Element Methods (DEM) the detachment criterion of particles should depend on the particle size. In the present paper, we analyze how the mesh dependent detachment criterion has to be introduced to guarantee the macroscopic invariance of mechanical behavior of a material. We find that it is possible to formulate the criterion which describes fracture both in tensile and shear experiments correctly.

Evaluation of the Mechanical Strength of a Concrete Modified with PET Fibers from Post-Consumer Bottles

2020 ◽  
Vol 862 ◽  
pp. 66-71
Author(s):  
Victor Hugo Blancas-Herrera ◽  
Wilfrido Martínez-Molina ◽  
Hugo Luis Chavez-Garcia ◽  
Jorge Alberto Pacheco-Segovia ◽  
Sandra del Carmen Argüello-Hernández ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Mechanical Behavior ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Conventional Concrete ◽  
Pet Bottles ◽  
Concrete Mixtures ◽  
Hydraulic Concrete ◽  
Pet Fibers

The creation of sustainable hydraulic concrete from the use of waste materials, such as PET bottles, whose performance is better than the conventional concrete, has been a great challenge worldwide within the construction industry. This article shows a study on the application of PET fibers resulting from the recycling of post-consumer bottles, which will help increase their physical and mechanical behavior. Two concrete mixtures were made: a control mixture (M-C), with the proportions of a conventional concrete and a second mixture, adding 0.8% of PET fibers with respect to the cement mass (PR-0.8). Tests of electrical resistivity, ultrasonic pulse velocity, compressive strength, tensile strength and flexural strength were performed at the ages of 7 and 28 days. The results showed a slight improvement in the mechanical behavior of the PR-0.8 mixture, in contrast to the M-C mixture, given that a non-sudden failure occurs; while that the tests of electrical resistivity and pulse velocity indicate that the concrete produced is of good quality and durable.

Study on Microstructure and Mechanical Behavior of Magnetorheological Fluids with Mixed Particles

2011 ◽  
Vol 216 ◽  
pp. 465-468 ◽  
Author(s):  
Hai Tao Li ◽  
Xiang He Peng
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Particle Size ◽  
Shear Stress ◽  
External Magnetic Field ◽  
Mechanical Behavior ◽  
Magnetorheological Fluids ◽  
Size Ratio ◽  
Mr Fluids ◽  
Particle Size Ratio

The microstructure and mechanical properties of magnetorheological (MR) fluids with mixed particles of different size are investigated. The interaction between particles of different radius is obtained and the model for motion of particles is proposed. Under an external magnetic field, the microstructure and yield shear stress of MR fluids with mixed particles of different sizes are simulated. It shows that particle size ratio in bidisperse suspensions can influence the performance of MR fluids.

Sign in / Sign up

Export Citation Format

Share Document