scholarly journals Composite Materials Behaviour. Study, Development and Implementation of the Hypoelastic Model

2021 ◽  
Vol 58 (2) ◽  
pp. 167-175
Author(s):  
Marcela Sava
Keyword(s):  
Numerical Simulation ◽  
Composite Materials ◽  
Linear Part ◽  
Plastic State ◽  
Powder Materials ◽  
Continuous Transition ◽  
Deformation Speed ◽  
Simple Compression ◽  
Hypoelastic Model ◽  
Behaviour Study

The purpose of this research is to study and develop the formulation of a rheological law for composite materials with elasto-plastic behaviour in cold compression. Starting from the generally known relationships in literature, the hypoelastic model proposed for the composite materials behaviour (as powder materials) has been developped/explained, ensuring the understanding of the research. The hypolastic theory has been used for modeling the continuous transition from elastic to plastic state for a powder material. The material behaviour is described through an isotropic tensor relationship between the deformation speed tensor, Cauchy�s stress tensor and its derivative in relation to time (the Jaumann�s derivative). Only the linear part has been used from the general form of the law which depends on scalar functions. The calculations lead to relationships depending on five parameters which are identified according to experimental data. A numerical simulation of the stress-strain evolution during the simple compression of a diepressed powder sample is made; the numerical simulation has been validated by the experimental results.

scholarly journals Nonlinear Mechanics Study of Concrete T-beam Bridge With Cracking Damage Based on Numerical Simulation

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Numerical Simulation ◽  
Constitutive Relationship ◽  
Plastic State ◽  
Nonlinear Mechanics ◽  
Element Analysis ◽  
Structural Rigidity ◽  
Beam Bridge ◽  
Relationship Of ◽  
T Beam ◽  
Selection Of

The cracking damage of concrete bridge will seriously affect the overall safety of a structure. In this study, based on the numerical simulation, finite element analysis was carried out on the concrete T beam through the ANSYS software, and the selection of elements and the constitutive relationship of materials in the numerical simulation were introduced. It was found from the results of numerical simulation that the cracks of T beam continued to develop under the action of load, the concrete entered the plastic state from the elastic state and the mid-span deflection increased with the increase of load. In the case of the change of cracks, the larger the crack height, the larger the crack range of the beam. With the increase of load, the structural rigidity continued to degenerate, and the compressive stress of the concrete also increased. The research in this paper proves the validity of numerical simulation in the study of nonlinear mechanics of beam bridge and also makes some contributions to the study of crack damage of beam bridge.

scholarly journals Composite Materials for Passive Antiradar Camouflage

2019 ◽  
Vol 57 (2) ◽  
pp. 15-22
Author(s):  
Cristiana Epure ◽  
Teodora Zecheru ◽  
Gabriel Epure ◽  
Claudiu Lazaroaie ◽  
Ovidiu Iorga ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials ◽  
Composite Structure ◽  
Experimental Device ◽  
Active Charcoal ◽  
Powder Materials ◽  
Frequency Range ◽  
Polymeric Matrices ◽  
Aluminum Trioxide ◽  
Polymeric Structures

In this study, a new solution for the development of an antiradar camouflage by overlaying several mono-pigment polymeric structures in a composite structure is provided. In this respect, powder materials with antiradar properties (carbon nanotubes, graphite, active charcoal, aluminum trioxide) were embedded in polymeric matrices. The performances of the developed products were tested using an experimental device for the measurement of electromagnetic efficiency within the frequency range from 1 to 18 GHz.

Numerical simulation in the absorption behavior of Ti6Al4V powder materials to laser energy during SLM

2019 ◽  
Vol 268 ◽  
pp. 25-36 ◽  
Author(s):  
Dongyun Zhang ◽  
Weidong Wang ◽  
Yanwu Guo ◽  
Songtao Hu ◽  
Dongdong Dong ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Energy ◽  
Powder Materials

Numerical simulation of the 3D flow field in a ring die pellet mill considering viscous heating

2020 ◽  
Vol 11 (03) ◽  
pp. 2050025
Author(s):  
Yong-Mei Wang ◽  
Xiao-Peng Huang ◽  
Jin-Feng Wu ◽  
Wan-Xia Yang
Keyword(s):  
Numerical Simulation ◽  
Shear Rate ◽  
Flow Field ◽  
Velocity Shear ◽  
Viscous Heating ◽  
Powder Materials ◽  
Extrusion Force ◽  
3D Flow ◽  
Forming Process ◽  
Extrusion Forming

Viscous heating has a substantial influence on the extrusion forming process and product quality of powder materials. This study selected the MUZL420 ring die pellet mill as the research object, from which a 3D flow physical model was established. The numerical simulation of 3D nonisothermal flow in the extrusion pelletizing process of granulated alfalfa was performed with POLYFLOW. The distribution laws of pressure, velocity, shear rate, viscosity, viscous heating and temperature in the flow field were revealed to thoroughly investigate the pelletizing process and provide a reference for structural optimization and process control. The results showed that two extrusion zones in the pelleting chamber were symmetrical with respect to the center, and the significant pressure gradient along the rotating direction of the ring die and the roller caused the material to flow back in the opposite direction. There were larger velocity gradients, shear rates and viscous heating levels in the deformation and compaction zone, the negative pressure zone behind the extrusion zone and the die holes. The distribution of viscosity was opposite to that of the shear rate. The temperature increase area caused by viscous heating gradually expanded from the material inlet to the bottom of the extrusion chamber along the [Formula: see text]-axis direction, and the temperature increased accordingly. The extrusion force and the forming temperature in the extrusion forming zone were captured in the numerical simulation. The extrusion forming density was calculated with the regression prediction model established through the simulation experiment of pelletizing with a ring die. Through a comparison with the results of mean alfalfa pellet density from the ring die pellet mill experiment, the relative error was less than 5%, which indicated that the numerical simulation method was reliable.

Numerical Simulation of the Laser Infusion Process of a Ni-Cr-B-Si Cover Strengthened with Zirconium Oxide Particles

2021 ◽  
Vol 1037 ◽  
pp. 552-557
Author(s):  
Valery V. Alisin ◽  
Mikhail N. Roshchin ◽  
Janusz Gladyszewski
Keyword(s):  
Numerical Simulation ◽  
Process Modeling ◽  
Thermophysical Properties ◽  
Zirconium Oxide ◽  
Numerical Study ◽  
Powder Materials ◽  
Heat Current ◽  
Oxide Particles ◽  
Properties Of Materials ◽  
Positive Effect

The issues of the process modeling of wear-resistant covers infusion of the NiCrBSi system, strengthened by the addition of solid powder materials are studied in the article. The results of a numerical study of the effect of heat current and thermophysical properties of materials on the process of heating and infusion of the cover are presented. The statements about the advantages of powders based on ZrO2 are demonstrated. Particular attention is paid to the issue of cracking in the cover after infusion. The assumption is substantiated about the positive effect of the addition of ZrO2 powders on the increase in the crack resistance of the cover.

Sign in / Sign up

Export Citation Format

Share Document