The ballistic perforation resistance of 50 mm thick concrete slabs impacted by 20 diameter ogive-nose steel projectiles is investigated experimentally and numerically. Three commercially produced concretes with nominal unconfined compressive strengths 35, 75 110 MPa were used to cast material test specimens slabs. After curing, impact tests carried out determine the limit curve velocity for eac...

The reliability of the pertinent parameters set Johnson-Cook constitutive model is highly linked with friction condition at tool-chip-workpiece interface. In present work, a study on influence Coulomb’s coefficient observables such as forces, chip thickness and curvature by FE simulation orthogonal cutting Ti6Al4V alloy has been carried out. A an Arbitrary Lagrangian-Eulerian (ALE) approach emp...

Titanium alloy is a typical hard-to-machine metal and lot of serrated chips are often formed in the cutting process. The appearance will not only cause fluctuation force, resulting decline accuracy, but also lead to rapid wear tools. In this study, formation mechanism chip Ti-6Al-4V titanium was investigated by two-dimensional simulation model alloy, which established using Johnson–Cook constit...

Severe plastic deformation in cutting operations such as milling might change mechanical properties (especially the strength and hardness) of machined surface its underlying layers. This phenomenon called work hardening reduces machinability. study presents an analytical solution to calculate upper layers workpiece process 2205 duplex stainless steel. In this regard, stresses regions are calcul...

This study aimed to analyze the defects of large residual stress in laser additive manufacturing metal parts by establishing a milling numerical simulation Ti6Al4V titanium alloy thin-walled based on Johnson-Cook constitutive model alloy, modified Coulomb friction model, physical chip separation criterion and other theories, combined with finite element software ABAQUS. The influences depth, in...

Abstract Under cold spray conditions, the modified Johnson–Cook model was adopted to perform single and multiple particle simulation for spherical elongated aluminum alloy- Al-6061 feedstock particles. The splat formations were realistically presented; temperature evolution throughout deposition process stayed below melting point of Al-6061, particles exhibited restitution impact velocities low...

Previous studies have reported significant differences in the Johnson-Cook (J-C) parameters of Ti6Al4V alloy. Thus, various serrated chip morphologies, cutting forces, and temperatures are obtained when different constitutive used for numerical simulation analyses, which decreases reliability model. Therefore, it is necessary to investigate analyze errors due J-C parameters. In this study, mech...

In this research, finite element analysis of the conventional drilling and vibration assisted drilling is carried out. The ABAQUS software is employed for FE analysis. The Johnson-Cook models for both plastic deformation and damage are employed for FE simulation.The results of the FE analysis are then verified with experimental results in both conventional and vibration assisted drilling on Al ...

To study the deformation and fracture mechanism of 6061 aluminum alloy extruded pipe after secondary heat treatment under different stress triaxiality, a Johnson–Cook failure model was developed. Through FEM method SEM, types tensile specimens analyzed. The research results show that could better simulate types, parameters were finally obtained D1 = 0.29, D2 1.356, D3 ?2.567. With increase stra...