In order to predict the microstructure change,precisely the grain size evolution in the workmaterial during machining,a physical-based Dislocation Density (DD) model was coupled with the MTS12345NextApplication of the secant method to prediction of flow The flow curves of the constituents were given by the Swift equation in which the material constants were described as functions of microstructural factors,chemical compositions and process parameters.The iterative calculating procedure to predict a stress-strain curve of
Based on these experimental data,the simulation models for predicting flow stress and microstructure evolution have been built by back propagation (BP) neural network.The numerical results gained via the networks were compared with the experimental results.Author Elham Mirkoohi,Mostafa Mahdavi,Dongsheng Li,Hamid Garmestani,Steven Y.LiangPublish Year 2021A dislocation-based model for the microstructure evolution Jan 01,2021·A comprehensive dislocation density-based model is developed for hot deformation. The microstructure and flow stress evolutions are predicted up to large strains. Continuous dynamic recrystallization and static and dynamic recovery are considered. The role of the restoration mechanisms is considered for both and phases.Author Juan Camilo Osorio,Sepideh Abolghasem,Juan Pablo Casas RodriguezPublish Year 2018(PDF) Microstructure Evolution and Flow Stress Model of a PDF 20Mn5 steel is widely used in the manufacture of heavy hydro-generator shaft due to its good performance of strength,toughness and wear Find,read and cite all the research you need on
A constitutive model is proposed for simulations of hot metal forming processes.This model is constructed based on dominant mechanisms that take part in hot forming and includes intergranular deformation,grain boundary sliding,and grain boundary diffusion.A Taylor type polycrystalline model is used to predict intergranular deformation.Author Sun,JinMODELLING HIGH TEMPERATURE MECHANICALcalculate the flow stress as a function of time and strain,which directly provides a flow stress diagram.The model has been developed and tested for a wide range of alloy types,including steels and Ti-alloys as well as Ni-based superalloys [12,13].A noticeable feature of the present work is that flow softening atCited by 10Publish Year 2020Author P.F.Gao,P.F.Gao,J.Guo,M.Zhan,Z.N.Lei,M.W.FuA dislocation-based model for the microstructure evolution Flow stresses,dislocation densities,and sizes of both phases are predicted as a function of strain rate and temperature for different starting microstructures.The thickness and aspect ratio of
flow stress curves and microstructure after hot compression are obtained.Effects of temperature and strain rate on microstructure are analyzed.Based on the classical stress-dislocation relation and the kinetics of dynamic recrystallization,a two-stage constitutive model is developed toCited by 13Publish Year 2019Author Gauri Mahalle,Nitin Kotkunde,Amit Kumar Gupta,R.Sujith,Swadesh Kumar Singh,Y.C.Lin(PDF) Multi-physics Modelling in Machining OFHC Copper Multi-physics Modelling in Machining OFHC Copper Coupling of Microstructure-based Flow Stress and Grain Refinement ModelsCited by 1Publish Year 2019Author Jianqiao Hu,Hengxu Song,Zhanli Liu,Zhuo Zhuang,Xiaoming Liu,Stefan SandfeldHot Deformation Behavior of Alloy 800H at Intermediate Sep 10,2014·Based on the experimental data,the Johnson-Cook,modified Johnson-Cook,and Arrhenius-type constitutive models were established to predict the flow stress during hot deformation.A comparative study was made on the accuracy and effectiveness of the above three developed models.
Aug 05,2020·Unified prediction of flow stress,microstructure,damage and fracture is realized.Abstract Development of a hybrid constitutive model for modelling of the flow behavior,microstructure evolution,damage initiation and fracture formation is crucial in study of hot deformation of titanium alloys.Cited by 2Publish Year 2009Author De Pari,LuigiMicrostructure-Dependent Dynamic Flow Stress inpublication.In this chapter a physics based dynamic flow stress model is presented.The model is derived based on the interaction of dislocations with various types of stress barriers.In this regard the model examines the second phase as a long range barrier in carbon steels with different pearlite volume fraction.Experimental stress-Cited by 2Publish Year 2019Author Nima Safara,Nima Safara,Göran Engberg,John ÅgrenA New Microstructure-Sensitive Flow Stress Model for the Nov 14,2016·This flow stress is developed to model the flow behavior of titanium alloys in machining at speed of higher than 5 m/s,characterized by extremely high strains (210 or higher),high strain rates (10 4 10 6 s 1 or higher),and high temperatures (6001300 °C).The flow stress sensitivity to mechanical and material parameters is analyzed.
the ow stress-strain data achieved from the proposed constitutive model are in good agreement with the actual test measurements.The constitutive model prediction accuracy is found to be improved,Cited by 3Publish Year 2019Author M.Saez-de-Buruaga,P.Aristimuño,D.Soler,E.DEramo,A.Roth,P.J.ArrazolaMicrohardness Prediction Based on a Microstructure A microstructure-sensitive flow stress model coupled the phenomena of grain refinement,deformation twinning,and phase transformations is first proposed.Then the microstructure-sensitive flow stress model is implemented into the cutting simulation model via a user-defined subroutine to analyze the flow stress variation induced by the microstructure evolutions during HSM Ti-6Al-4V.Cited by 5Publish Year 2018Author Qingqing Wang,Zhanqiang LiuMicrostructure based flow stress modeling for quenched and Oct 05,2015·In this work,material modeling for describing flow stress behavior of the SNCM439 alloy steel under different tempering conditions was introduced.Microstructure based models were developed on both macro- and micro-scale.The models were afterwards applied in FE simulations for predicting stressstrain responses of the tempered steels.
Dec 31,2019·Based on the two analytical models proposed in this work,i.e.,the SN dominated model and the SAS dominated model,the flow stress can be predicted through the following calculation flowCited by 8Publish Year 2018Author Tianrui Li,Guohuai Liu,Mang Xu,Bingxing Wang,Tianlian Fu,Zhaodong Wang,Raja Devesh Kumar MisraModeling Microstructure Evolution in a Martensitic ·The model can determine the flow stress based on a physical description of dislocation density evolution. A physically based model is employed to predict the microstructure evolution in a 13 pct chromium steel during and after hot compression tests at temperatures ranging from 900 up to 1200 °C and strain rates of 0.01,1,and 10 s 1.Cited by 9Publish Year 2007Author Qing Wang,J.Lai,Dong Li SunFlow Stress Prediction and Hot Deformation Mechanisms in With its analytical and learning capability,the variation in flow stress,microstructure and mechanical properties can be studied.The ANN model is usually divided into three parts to predict flow stress () during hot deformation,as shown in Figure 4,including the input layer,hidden layer and output layer.The circle in the schematic represents the different basis unit neuron.
Jan 20,2018·Material maximum flow stress (a constitutive model) as a function of thermomechanical conditions and sub-grain size is predicted considering a saturated state in microstructure using optimization algorithms for reaching the validated temperature rise based on modified Hahns model.Direct extrusion process analysis with proposed numerical Nov 01,2009·It was concluded that once the initial material characteristics are accounted for in the flow stress model it will more accurately and efficiently predict the flow stress response for the actual material being considered than a generic experimental flow stress-based material library entry in DEFORM(TM) 3-D.Improved Predictability of Microstructure Evolution during Two different mesoscale models based on dislocation reactions are developed and applied to predict both the flow stress and the microstructure evolution during the hot deformation of titanium alloys.Three distinct populations of dislocations,named mobile,immobile,and wall dislocations,describe the microstructure,together with the crystal misorientation and the densities of boundaries.
A new mathematical formulation to predict flow stress and microstructural change in hot forming will be presented in this paper.This model is based on an incremental formulation taking the dislocation density as a representative variable.Microstructure Characteristics and Comparative Analysis of May 28,2019·Flow stress behavior is significantly affected by test temperatures and strain rates.Microstructure characteristics of deformed test specimens have been examined using scanning electron microscope and electron backscatter diffraction (EBSD).The fractography study revealed that fracture is mix-mode type,i.e.,ductile and brittle.Microstructure Integrated Modeling of Multiscan Laserpropriate models of microstructure changes are incorporated into thermal-mechanical FEM simulation in order to better predict the mechanical properties and geometry change of the formed parts.2 Microstructure Dependent Flow Stress Modeling for Laser Forming 2.1 Modeling scheme.A typical laser forming process of
Jan 04,2021·This model is based on the dislocation dynamics and thermal activation theory with a combination of three main components of athermal stress,thermal stress,and threshold stress.The MTS flow stress model is embedded into a fully coupled thermo-mechanical incremental plasticity model to predict the residual stress during AM processes from the prediction of temperature field andMicrostructure based flow stress model to predict Jan 01,2019·A new flow stress model is proposed to describe the behaviour of ferritepearlite steels based on microstructure properties,including the effect of high strains,strain rates and temperatures.The model introduces strain hardening as a function of the pearlite ratio,Microstructure based prediction of strain hardening The FEM of representative volume element (RVE) with a microstructure-based constitutive model model is proposed for predicting the overall stress-strain behavior of the investigated dual-phase steels.
Microstructure evolution based particle chain model for shear yield stress of magnetorheological fluids Yongbo Peng and Pei Pei Journal of Intelligent Material Systems and Structures 0 10.1177/1045389X20951259Multi-physics Modelling in Machining OFHC Copper comparison purpose the classical JohnsonCook (JC) thermo-viscoplastic flow stress model is also introduced.In order to predict the microstructure change,precisely the grain size evolution in the workmaterial during machining,a physical-based Dislocation Density (DD) model was coupled with the MTS model in the framework of an Arbitrary Lagrangian Eulerian (ALE) Finite Elements (FE)Radial hopper flow prediction using a constitutive model We present theoretical predictions of granular flow in a conical hopper based on a continuum theory employing a recently-developed constitutive model with microstructure evolution by Sun and Sundaresan .The model is developed for strain rate-independent granular flows.The closures for the pressure and the macroscopic friction coefficient are linked to microstructure through evolution
A large reduction rolling process was used to obtain complete dynamic recrystallization (DRX) microstructures with fine recrystallization grains.Based on the hyperbolic sinusoidal equation that included an Arrhenius term,a constitutive model of flow stress was established for the unidirectional solidification sheet of AZ31 magnesium alloy.Furthermore,discretized by the cellular automata Theoretical model for subsurface microstructureTheoretical model for subsurface microstructure prediction in micro- machining Ti-6Al-4V alloy - Experimental validation model with dislocation density-based strain gradient constitutive equation is proposed and applied to reveal the far- the hardness can be related to flow stress.