Numerical Simulation and Forecasting of Mechanical Properties for Multi-Component Nonferrous Dispersion-Hardened Powder Materials

2007 ◽  
Vol 534-536 ◽  
pp. 397-400
Author(s):  
Lyudmila Ryabicheva ◽  
Dmytro Usatyuk
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Comparative Analysis ◽  
Finite Elements ◽  
Mathematical Simulation ◽  
Input Data ◽  
Laboratory Experiments ◽  
Powder Materials ◽  
Output Data ◽  
Simulation Results

A new mathematical simulation technique for physico-mechanical properties of multicomponent powder materials is proposed in this paper. The main advantage of the technique is that finite elements representing different components are placed into a common mesh and may exchange their properties. The input data are properties of components and specified value of porosity. The output data are properties of material after sintering. The technique allows us to investigate the influence of each component of a material on the properties and distribution of properties inside the sample. The comparative analysis of materials with different compositions is based on simulation results that are well concordant with the results of the laboratory experiments.

scholarly journals Моделирование процесса усадки термоэлектриков при искровом плазменном спекании на примере Ge-Si

2019 ◽  
Vol 53 (6) ◽  
pp. 781
Author(s):  
А.С. Тукмакова ◽  
К.Л. Самусевич ◽  
А.В. Новотельнова ◽  
И.Л. Тхоржевский ◽  
Е.С. Макарова
Keyword(s):  
Mechanical Properties ◽  
Finite Elements ◽  
Pressure Field ◽  
Ceramic Powder ◽  
Comsol Multiphysics ◽  
Powder Materials ◽  
Thermal And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Simulation Results

The densification of Ge-Si within spark plasma sintering has been simulated. The simulation was based on finite elements method and implemented in Comsol Multiphysics. The model of mechanical processes was based on the simulation results published earlier for metal and ceramic powder materials. The model included plastic and elastic deformation description, impact of porosity on electrical, thermal and mechanical properties. The pressure field in the sample has been calculated. The change of sample diameter due to the expansion and compression has been obtained for the soaking period.

Design of 25-Gb/s Half-Rate Clock and Data Recovery Circuit for Optical Communication

2013 ◽  
Vol 385-386 ◽  
pp. 1278-1281 ◽  
Author(s):  
Zheng Fei Hu ◽  
Ying Mei Chen ◽  
Shao Jia Xue
Keyword(s):  
Optical Communication ◽  
Input Data ◽  
Clock And Data Recovery ◽  
Cmos Technology ◽  
Data Recovery ◽  
Phase Detector ◽  
Voltage Controlled Oscillator ◽  
Output Data ◽  
Data Phase ◽  
Simulation Results

A 25-Gb/s clock and data recovery (CDR) circuit with 1:2 demultiplexer which incorporates a quadrature LC voltage-controlled-oscillator and a half-rate bang-bang phase detector is presented in this paper. A quadrature LC VCO is presented to generate the four-phase output clocks. A half-rate phase detector including four flip-flops samples the 25-Gb/s input data every 20 ps and alignes the data phase. The 25-Gb/s data are retimed and demultiplexed into two 12.5-Gb/s output data. The CDR is designed in TSMC 65nm CMOS Technology. Simulation results show that the recovered clock exhibits a peak-to-peak jitter of 0.524ps and the recovered data exhibits a peak-to-peak jitter of 1.2ps. The CDR circuit consumes 121 mW from a 1.2 V supply.

scholarly journals Study on Mechanical Properties of Submunition’s Ribbon Straightening Section

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Dong-ze Qin ◽  
Wei Zhang ◽  
Shu-Yun Zhang ◽  
Tian-Ji Guo ◽  
Shui-Yuan Pei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Tensile Force ◽  
Physical Structure ◽  
Simulation Software ◽  
Tension Test ◽  
Response Characteristics ◽  
Experimental Scheme ◽  
Drop Velocity ◽  
Simulation Results

The humanitarian damage caused by the unexploded submunitions is one of the hot issues of concern to the international community at present. A portion of the submunition that did not explode was caused by a break at the connection between the ribbon riveting and the fuze. According to the physical structure of the submunition and the trajectory into which it was ejected, we analyzed the forces of the submunition in flight, deduced the related mathematical models, and clarify the key elements of the mechanics. In this paper, the commercial simulation software was used to calculate the mechanical properties of the ribbon. And the variation regularity between drop velocity and straightening force of ribbon are revealed. And the response characteristics of different material ribbon with different sizes of riveting holes and riveting joints under tensile action were simulated. The simulation results show that, in the trajectory environment with 30 m/s~55 m/s typical stream speed, the tensile force of the ribbon is less than 300 N, and the application concentration of the connecting parts of the riveting joint and the ribbon will not cause the failure of the kevlar ribbon, but it will cause the failure of the nylon ribbon. In order to verify the variation of the tension of kevlar ribbons in different trajectory environments, we designed the experimental scheme of tension test of the ribbon straightening section of submunition and conducted experiments. Experimental results and numerical simulation results revealed the same law. This paper provides effective technical support for solving the problem of unexploded submunitions.

scholarly journals Computational Behavioral Models in Public Goods Games with Migration Between Groups

2021 ◽  
Author(s):  
Marco Tomassini ◽  
Alberto Antonioni
Keyword(s):  
Numerical Simulation ◽  
Public Goods ◽  
Laboratory Experiments ◽  
Replicator Dynamics ◽  
Behavioral Models ◽  
Public Goods Games ◽  
Heterogeneous Behavior ◽  
Simulation Results ◽  
Human Participants ◽  
Simple Sets

Abstract In this study we have simulated numerically two models of linear Public Goods Games where players are equally distributed among a given number of groups. Agents play in their group by using two simple sets of rules that are inspired by the observed behavior of human participants in laboratory experiments. In addition, unsatisfied agents have the option of leaving their group and migrating to a new random one through probabilistic choices. Stochasticity, and the introduction of two types of players in the population, help simulate the heterogeneous behavior that is often observed in experimental work. The numerical simulation results of the corresponding dynamical systems show that being able to leave a group when unsatisfied favors contribution and avoids free-riding to a good extent in a range of the enhancement factor where defection would prevail without migration. Our numerical simulation results are qualitatively in line with known experimental data when human agents are given the same kind of information about themselves and the other players in the group. This is usually not the case with customary mathematical models based on replicator dynamics or stochastic approaches. As a consequence, models like the ones described here may be useful for understanding experimental results and also for designing new experiments by first running cheap simulations instead of doing costly preliminary laboratory work. The downside is that models and their simulation tend to be less general than standard mathematical approaches.

Detection of Insulation Defects in Automated In-Process Testing of Electric Wire during its Extrusion

2019 ◽  
Vol 942 ◽  
pp. 141-150
Author(s):  
Alexander Goldshtein ◽  
Galina Vavilova ◽  
Alexander Rumkin ◽  
Oldrich Starý
Keyword(s):  
Numerical Simulation ◽  
Mathematical Simulation ◽  
Physical Model ◽  
The Core ◽  
Process Testing ◽  
Capacitive Method ◽  
Simulation Results ◽  
Local Defects ◽  
Air Cavities ◽  
The Impact

The paper describes the electro-capacitive method for monitoring wire capacitance, which is implemented using the CAP-10 device, employed for in-process testing of the single core electric wire capacitance. Focus is made on the operating principle of the CAP-10 device. The possibility of using the CAP-10 device for detecting local defects in wire insulation is proved. Insulation defects such as foreign inclusions in the form of copper shavings, air cavities inside insulation and those at the core–insulation boundary are modeled. The impact of the defect geometric parameters on the wire capacitance measured during in-process testing is investigated through numerical simulation. Mathematical simulation results are validated through the physical model using the CAP-10 device.

scholarly journals Influence of Heating on Tensile Physical-Mechanical Properties of Granite

2019 ◽  
Vol 38 (2019) ◽  
pp. 505-515 ◽  
Author(s):  
Xinyu Fang ◽  
Jinyu Xu ◽  
Shi Liu ◽  
Haoyu Wang
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Tensile Strength ◽  
Longitudinal Wave ◽  
Constant Temperature ◽  
Room Temperature ◽  
Laboratory Experiments ◽  
Turning Point ◽  
Longitudinal Wave Velocity ◽  
Granite Samples

AbstractHeating procedures dramatically influence the physical-mechanical properties of rock. In this paper, via both numerical simulation and laboratory experiments, we examine the influence of constant temperature period (CTP, from 0.5 to 5 h) and predetermined temperature (PDT, from room temperature to 1,000℃) on the tensile mechanical properties of the Qinling granite, China. Results indicate that: CTP has a significant impact on the tensile mechanical properties of granite. For different PDTs, the density, longitudinal wave velocity (LWV) and tensile strength (TS) of granite decrease with increasing CTP. When CTP reaches the constant temperature turning-point (CTT), heating has fully affected the granite samples. The variation in LWV and TS versus temperature can be divided into four stages: 25–200℃, 200–600℃, 600–800℃ and 800–1,000℃. LWV and TS are negatively related to temperature and are more sensitive to temperature at higher PDTs. In addition, TS is more sensitive to temperature than LWV when PDT increases. The effects of CTP and PDT on LWV are similar to that of TS. Since the measurement of LWV is lossless, researchers can safely determine the appropriate CTP or CTT for any PDT and predict the tensile mechanical properties of rock by LWV analysis.

Effect of Dies Temperature on Mechanical Properties of Hot Stamping Square-Cup Part for Ultra High Strength Steel

2010 ◽  
Vol 129-131 ◽  
pp. 390-394
Author(s):  
Cheng Xi Lei ◽  
Zhong Wen Xing ◽  
Hong Ya Fu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Hot Stamping ◽  
High Strength ◽  
Hot Forming ◽  
Forming Process ◽  
Stamping Process ◽  
Ultra High Strength Steel ◽  
Mechanical Properties Testing ◽  
Simulation Results

The numerical simulation of hot-stamping process was carried out for UHSS square-cup parts, and the influence of dies temperature on the hot-stamping process was anlysised. Besides, through the microstructure analysis and mechanical properties testing of the formed parts, effects of dies temperature on microstructures and mechanical properties of hot-stamping square-cup parts were obtained. The experiment and simulation results showed that the mechanical properties of the UHSS are strongly dependent on the temperature, so the dies temperature is one of the most important parameters that have to be taken into account in designing the hot-forming dies and the hot-forming process.

Monitoring Measurement of Vehicular Tunnels and Finite Element Numerical Simulation Analysis

2012 ◽  
Vol 204-208 ◽  
pp. 2832-2836
Author(s):  
Lei Chen ◽  
Lei Wang ◽  
Lin Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Comparative Analysis ◽  
Linear Regression ◽  
Simulation Analysis ◽  
Field Monitoring ◽  
Monitoring Data ◽  
Finite Element Numerical Simulation ◽  
Simulation Results

The vault settlement, the horizontal convergence of Fangdoushan tunnel are monitored and measured. The changing curves with time are drawn; while the data of convergence measurement is analyzed with linear regression. The whole constructing process is simulated to analyze based on FLAC3D. The results of comparative analysis of the data from field monitoring and the data from numerical simulation shows that the simulation results accord well with the actual monitoring data, which will furthermore optimize both the design and the scientific construction

Sign in / Sign up

Export Citation Format

Share Document