Residual stress has become more important than ever with the increasing performance requirement of components especially for those applied in safety-critical areas. As machining process is fundamentally correlated acquired component properties, it essential to fully understand formation mechanism residual stresses cutting and its influence on component. This paper presents results based numerical experimental analysis effect tool geometry thermal-mechanical load orthogonal Inconel718 alloy....

Surface roughness is a commonly used criterion for characterization of surface quality in machining operation. In the study micro-scale mechanical properties machined and cutting tool with nanoindentation, prefect finish on test specimen often required reliable result. However, difficult to obtain from operation due limitation geometry dynamics. presented paper, effect nanoindentation measurement was investigated by using finite element method. A 3D model three levels developed simulate...

The aim of this paper is to gain a better understanding the impact different micro-geometries has on stress distribution in cutting tools. Both principal and effective are studied. These quantities have major occurrence damages tool such as crack formation, flaking, chipping, breakage plastic deformation. development stagnation zone also investigated well effect zone. A finite element model developed which enables examination these aspects, detail. It was found that predicted metal phenomena...

Abstract Segmented chip morphology has a significant influence on distribution of residual stress and surface topography machined in machining difficult-to-cut materials. In this paper, Coupled Eulerian Lagrangian (CEL) model is employed to investigate the effect segmented integrity (residual topography) orthogonal Inconel718 with uncoated carbide inserts. A mesh sensitivity study performed by developing following three different grid resolutions: coarse (mesh size 35 μm), medium (10 μm)...

Machining-induced residual stresses in a part can significantly influence its performance and service time. It is common that the final surface of produced after multiple cuts machining process. In cuts, previous could often generate accumulated strain/stress temperature on surface. These will be brought to subsequent cut or continuously affect cutting forces, process temperatures, deformation zones, etc. cut, eventually part. This paper reports joint experimental numerical investigation...

This paper presents the development of a FE-simulation model to predict mechanical stresses and thermal loads that cutting tool polycrystalline cubic boron nitride (pcBN) is subjected to, when machining AISI 316L. The serrated chip formation 316L has major impact on periodic acting tool. Therefore, it vital correctly this formation. One difficulties with FE-simulations metal extreme deformations in workpiece material, often leads highly distorted mesh. uses Coupled Eulerian-Lagrangian (CEL)...

Traditionally, the development and optimization of machining process with regards to subsurface deformation are done through experimental method which is often expensive time consuming. This article presents a finite element model based on an updated Lagrangian formulation. The numerical able predict depth induced in high- speed Inconel 718 by use whisker-reinforced ceramic tool. effect that different cutting parameters tool microgeometries has will be investigated both numerically...

In situ X-ray diffraction was employed to gain insight into the tensile deformation behavior of harmonic structure (HS) nickel. HS consists a continuous network fine grains encompassing islands coarse grains. With aid newly developed separation algorithm, signals from and were analyzed separately. Using line profile analysis, evolution local stresses microstrains in respective grain fractions examined. Several stages identified during yielding onset plastic The mechanical individual related...

Tungsten is a prime candidate material for use in plasma facing components nuclear fusion reactors. This would entail weathering extreme conditions, such as high thermal loads and particle bombardment. It of vital importance to understand how tungsten mechanically responds these it impacted by the defects that form. The current communication considers mechanical properties are affected presence several nanosized lattice defects: interstitial helium (both scattered throughout sample centrally...

In the present study plasticity parameters in Johnson Cook model are determined on basis of process orthogonal cutting by use inverse analysis. Previously established links between material and such as chip thickness ratio, forces, temperatures, deformation zones, is used serve a starting point The AISI 4140 simulated using employed [1], being changed within an interval ±30%. analysis performed Kalman filter. for reference validated experimental results shown to predict with high level...

In this paper a fully coupled thermomechanical two-dimensional simulation model for orthogonal cutting is presented. The based on the arbitrary Lagrangian–Eulerian formulation with remeshing technique. material used workpiece includes Johnson–Cook plasticity, and as chip separation criterion damage law employed. different friction zones are modelled by Coulomb maximum limit friction. capability of to represent process realistically validated performing simulations feed depths. comparison...

We investigate the variation of elastic stiffness moduli and thermodynamic properties yttrium orthosilicate (Y2SiO5, YSO) under various doping concentrations Eu3+ ions. The model is based on a low temperature approximation (T<<θD) , plane-wave density functional theory (DFT) used to carry out calculations. results show that ions primarily occupy Y1 site basic molecule for all applied concentrations. overall shear, bulk, Young's exhibit decreasing trend with increasing concentration....

Molecular dynamic simulations inevitably demand large computational resources for structures of liner measures even as small a few tens or hundreds nanometers. Thus, computationally efficient method to simulate larger and, at the same time, retain properties and mechanical response atomic scale is in demand. One such approach peridynamics, which nonlocal extension continuum mechanics. In this study, we investigate possibility efficiently reproduce results from molecular (MD) by calibration...

The nanoindentation response of empty viral capsids is modeled using three-dimensional finite element analysis. Simulation with two different geometries, spherical and icosahedral, performed the code Abaqus. are as nonlinear Hookean elastic, both small large deformation analysis performed. Young's modulus determined by calibrating force-indentation curve to data from atomic force microscopy (AFM) experiments. Force-indentation curves for three directly compared experimental data. Predictions...