Scratch tests are a powerful and inexpensive tool for studying the mechanical properties of materials. The typically applied determining deformation behavior materials serves as quality assessment method measuring adhesion delamination coatings. However, extraction quantitative material parameters using scratch remains highly non-trivial and, contrary to instrumented indentation or tensile test...

A non-linear relation between fracture strain and temperature is observed in Split Hopkinson Tension Bar (SHTB) tests for free-cutting steel 50SiB8 at high strains temperatures, due to blue-brittleness. fourth-degree polynomial function the thermal parts of original modified Johnson-Cook (JC) constitutive equation suggested corresponding parameters are identified. Fracture modelling not reporte...

The commonly employed mathematical functions in constitutive models, such as the strain hardening/softening model, strain-rate hardening factor, and temperature-softening are reviewed, their prediction characteristics illustrated. results may assist one (i) to better understand behavior of model that employs a given function; (ii) find reason for deficiencies, if any, an existing model; (iii) a...

In this work, a meshfree method is used to simulate thermo-mechanical ductile fracture under finite deformation. A Galerkin meshfree formulation incorporating the Johnson-Cook damage model is implemented in numerical computations. We are interested in the simulation of thermomechanical effects on ductile fracture under large scale yielding. A rate form adiabatic split is proposed in the constit...

We examine the linear stability of the one dimensional inhomogeneous (shear banded) pressure-driven flow through a rectilinear microchannel predicted by the VCM model (Vasquez et al., A network scission model for wormlike micellar solutions I: model formulation and homogeneous flow predictions. J. Non-Newtonian Fluid Mech. 144:122-139, 2007). The VCM model is a microstructural network model tha...

A thermomechanical model of the friction stir welding (FSW) high-density polyethylene (HDPE) was developed by incorporating a Coupled Eulerian–Lagrangian (CEL) approach. Johnson Cook (JC) material HDPE through experimentally generated strain-rate- and temperature-dependent stress strain data. Two sets FSW process parameters with minimum maximum weld defects were numerically modeled. The calcula...

In this paper, 3D Finite Element Method (FEM)-based numerical modelling of precision hard turning has been studied to investigate the effects of chamfered edge geometry on tool forces, temperatures and stresses in machining of AISI 52100 steel using low-grade Polycrystalline Cubic Boron Nitrite (PCBN) inserts. An Arbitrary Lagrangian Eulerian (ALE)-based numerical modelling is employed for 3D p...

This study presents experimental results performed on samples of Eutectic solder material (63 wt. % Sn 37 wt. % Pb). The tests were performed at high strain rates using Split Hopkinson’s Pressure Bar (SHPB). The strain rates were in the range of 400s -1 to 1300s -1 . Heating unit was added to conventional SHPB to vary initial sample temperature conditions. Tests were conducted at room temperatu...

Finite edge radius plays a significant role in finish machining processes when the undeformed chip thickness is often less than a few hundred microns and comparable to the size of the cutting edge. At suboptimal cutting speeds, edge radius tools may induce deeper subsurface plastic deformation, increase microhardness through work-hardening and mostly due to the ploughing of the cutting edge. On...

We study thermomechanical deformations of a steel block deformed in simple shear and model the thermoviscoplastic response of the material by four different relations. We use the perturbation method to analyze the stability of a homogeneous solution of the governing equations. The smallest value of the average strain for which the perturbed homogeneous solution becomes unstable is called the cr...