scholarly journals A comparison of different hardening rules on a multi-step global manufacturing process modeling

2021 ◽  
Author(s):  
Diego Britez ◽  
Sana Werda ◽  
Raynald Laheurte ◽  
Philippe Darnis ◽  
Olivier Cahuc
Keyword(s):  
Process Modeling ◽  
Initial Point ◽  
Correct Choice ◽  
Dissipated Energy ◽  
Work Piece ◽  
Hardening Rule ◽  
Material State ◽  
Plastic Transformation ◽  
Hardening Rules

The main difficulty presented by the simulation of a global process that includes different forming stages is the correct characterization of the material state at the end of each of these stages, which in turn, are the initial point of the following process. Hardening variables are capable of characterizing the state of the material, which, after a plastic transformation, varies according to the direction of the solicitation and its intensity. The present work carries out an analysis of the influence in the election of the hardening rule used in the behavior law, comparing the most used approach. For a work piece solicited by combined efforts in multiple stages, results are obtained by numerical simulation. A correct choice will allow obtaining reliable predictions, not the solicitations but also to the final geometry and the dissipated energy in the global process, allowing an eventual optimization of such process.

Measurement of the Material State Including the Effects of Recovery and Recrystallization

2000 ◽  
Author(s):  
M. E. Bange ◽  
A. J. Beaudoin ◽  
M. G. Stout ◽  
S. R. MacEwen
Keyword(s):  
Elevated Temperatures ◽  
High Strain ◽  
Quantitative Measure ◽  
Experimental Program ◽  
Strain Rates ◽  
Compression Tests ◽  
State Variable ◽  
Mechanical Threshold ◽  
Material State

Abstract Deformation at elevated temperatures in combination with high strain rates leads to recovery and recrystallization in aluminum alloys. Previous work in recrystallization has emphasized the detailing of microstructural trend in progression from the deformed to the annealed state. In the following, we examine the effect of rate dependence on deformation on AA 5182 and AA 6061. It is demonstrated that identification of underlying microstructural mechanisms is critical. An experimental program is then outlined for characterization of recovery and recrystallization of AA 5182. Instantaneous hardening rate and flow stress are developed from interrupted compression tests. These data are used to establish a quantitative measure of recovery through evaluation of a state variable for work hardening, the mechanical threshold. It is intended that the results serve as a foundation for development of relations for evolution of a mechanical state variable in the presence of recrystallization. Such a framework is necessary for the practical prediction of interstand recrystallization in hot rolling operations.

scholarly journals Applied Sciences Special Issue: Ultrasonic Guided Waves

2019 ◽  
Vol 9 (18) ◽  
pp. 3869 ◽  
Author(s):  
Clifford J. Lissenden
Keyword(s):  
Applied Sciences ◽  
Scientific Inquiry ◽  
Guided Waves ◽  
Ultrasonic Guided Waves ◽  
Special Issue ◽  
Practical Applications ◽  
Material State ◽  
Characterization Of Materials ◽  
Nondestructive Characterization

The propagation of ultrasonic guided waves in solids is an important area of scientific inquiry due primarily to their practical applications for the nondestructive characterization of materials, such as nondestructive inspection, quality assurance testing, structural health monitoring, and for achieving material state awareness [...]

Cyclic Plasticity for Nonproportional Paths: Part 2—Comparison With Predictions of Three Incremental Plasticity Models

1978 ◽  
Vol 100 (1) ◽  
pp. 104-111 ◽  
Author(s):  
H. S. Lamba ◽  
O. M. Sidebottom
Keyword(s):  
Cyclic Loading ◽  
Material Property ◽  
Yield Surface ◽  
Strain Path ◽  
Kinematic Hardening ◽  
Cyclic Plasticity ◽  
Limit Surface ◽  
Hardening Rule ◽  
Hardening Models ◽  
Hardening Rules

Experiments that demonstrate the basic quantitative and qualitative aspects of the cyclic plasticity of metals are presented in Part 1. Three incremental plasticity kinematic hardening models of prominence are based on the Prager, Ziegler, and Mroz hardening rules, of which the former two have been more frequently used than the latter. For a specimen previously fully stabilized by out of phase cyclic loading the results of a subsequent cyclic nonproportional strain path experiment are compared to the predictions of the above models. A formulation employing a Tresca yield surface translating inside a Tresca limit surface according to the Mroz hardening rule gives excellent predictions and also demonstrates the erasure of memory material property.

On Modeling and Simulation of the Discharging Activity in Electrochemical Discharge Machining

2015 ◽  
Author(s):  
Baoyang Jiang ◽  
Shuhuai Lan ◽  
Jun Ni
Keyword(s):  
Process Modeling ◽  
Material Removal ◽  
Process Model ◽  
Energy Intensity ◽  
Good Accuracy ◽  
Material Removal Mechanism ◽  
Electrochemical Discharge Machining ◽  
Electrochemical Discharge ◽  
Releasing Process

Electrochemical discharge machining (ECDM) is a promising machining technology to process non-conducing and brittle materials, featuring high throughput and good accuracy in meso and micro scale machining of hard-to-machine materials. Currently ECDM has not yet attracted wide interest from the industry because of the low controllability and repeatability. There is a huge gap in process optimization to make ECDM viable in industry. A good process model is essential to achieve an improved and optimized process. The fundamental of ECDM is the discharging activity, which triggers various mechanisms to remove material. Therefore characterization of sparks from the aspects of electrical and thermal properties is the premise of process modeling. In this paper, experimental investigation and modeling of discharging activity was presented. The spark releasing process was studied in terms of discharge energy, intensity distribution, and material removal. Conic tool electrodes were fabricated to achieve more consistent discharging. The material removal mechanism was revealed by analytical derivation and simulated with numerical methods.

A Novel Approach to Process Modeling for Ultrasonic Plastics Welding

2010 ◽  
Author(s):  
M. Ying ◽  
C. K. Cheng ◽  
J. Wei
Keyword(s):  
Process Parameters ◽  
Process Modeling ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Dissipated Energy ◽  
Measured Temperature ◽  
Novel Approach ◽  
Interfacial Temperature ◽  
Welding Pressure ◽  
Fully Coupled

Ultrasonic plastics welding is a widely employed joining technique for thermoplastic polymer assembly nowadays. As one fusion joining method, the ultrasonic welding quality is mainly dependent on the interfacial temperature which is affected by many process factors, such as welding time, welding pressure, and vibration amplitude, as well as material properties. Many attempts have been made to understand the mechanism of creation of an ultrasonic weld but limited by the complexity of the welding process. The current study developed a novel approach to process modeling for ultrasonic plastics welding. The thermoplastic materials were characterized with time domain viscoelastic model. The energy dissipation by the viscoelasticity was converted into the heating source which caused the temperature rose. The temperature change affected the material and structure responses and eventually the dissipated energy. As such, a fully coupled thermal-stress finite element (FE) model was established to simulate the performances of the ultrasonic welding. With the fully coupled model, the temperature distribution and displacement could be solved accurately and simultaneously. Meanwhile, the interfacial temperature was experimentally measured under the different process parameters. The simulation model was further validated by the measured temperature. With this novel approach, the ultrasonic plastics welding process can be completely simulated and the process parameters can be optimized numerically.

scholarly journals EXPERIENCE IN USE OF RECUPERATIVE BURNERS DEVICES IN FURNACES OF PERIODIC ACTION FOR HEAT TREATMENT OF BLANKS IN SPC-2 OJSC «BSW – MANAGEMENT COMPANY OF HOLDING «BMC»

2018 ◽  
pp. 32-36 ◽  
Author(s):  
D. S. Jadchenko
Keyword(s):  
Cost Optimization ◽  
Initial Point ◽  
Heating System ◽  
Correct Choice ◽  
Point Of View ◽  
Environmental Friendliness ◽  
Periodic Action ◽  
Air Heating ◽  
Harmful Emissions ◽  
The One

In building and modernizing industrial furnaces the following important factors should be taken into account: on the one hand, economic efficiency must be ensured, and on the other hand it is important to reduce harmful emissions into the atmosphere, improve the working conditions of personnel, etc. At the same time, constantly increasing requirements for productivity and environmental friendliness should not adversely affect the period of cost recovery.This article considers the experience of using recuperative burners. Both positive and negative aspects of the use of burners are considered from the point of view of economics, ecology and technology.An important initial point of cost optimization is the correct choice of a heating system complete with an automatic control system. One example of an effective heating system is a burner with a built in air heating system (recuperative burner), which saves fuel, reduces harmful emissions and simultaneously improves the technical and economic performance of the furnaces.

Process modeling and characterization of thermoset composites for residual stress prediction

2021 ◽  
pp. 1-12
Author(s):  
Sagar P. Shah ◽  
Sagar U. Patil ◽  
Christopher J. Hansen ◽  
Gregory M. Odegard ◽  
Marianna Maiarù
Keyword(s):  
Residual Stress ◽  
Process Modeling ◽  
Thermoset Composites ◽  
Stress Prediction

Surface Roughness Measuring Based on the Theory of Fractal Geometry

2014 ◽  
Vol 551 ◽  
pp. 434-438
Author(s):  
Ding Gui Wu ◽  
Tie Qiang Gang ◽  
Xian Guang Fan ◽  
Jing Lin Wu
Keyword(s):  
Surface Roughness ◽  
Evaluation Method ◽  
Characteristic Length ◽  
Work Piece ◽  
Roughness Parameters ◽  
Statistical Parameters ◽  
Fractal Characteristic ◽  
Inductance Sensor ◽  
Higher Sensitivity

Conventionally several statistical roughness parameters are used for describing surface roughness. But instruments with different resolutions and scan lengths yield different results of these statistical parameters for the same surface. Due to the limitations of traditional characterizing methods, the fractal characteristic of the rough surface is studied in this paper. A surface roughness measuring instrument is redesigned based on the on theTalysurf5Μ for both hardware and software. The signal conditioning process of the inductance sensor is analyzed. The grinding samples measurements indicate that work-piece surface presents fractal characteristic, and larger roughness level Ra corresponds to larger fractal dimensionDbut smaller characteristic length scaleG. The fractal characterization of surface roughness, to some extent, overcomes the deficiencies of conventional evaluation method, and shows higher sensitivity and accuracy.

Characterization of strain-induced damage in composites based on the dissipated energy density part I. Basic scheme and formulation

1995 ◽  
Vol 22 (2) ◽  
pp. 71-96 ◽  
Author(s):  
P.W. Mast ◽  
G.E. Nash ◽  
J.G. Michopoulos ◽  
R. Thomas ◽  
R. Badaliance ◽  
...  
Keyword(s):  
Energy Density ◽  
Dissipated Energy ◽  
Basic Scheme
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