The Dang Van Criterion for Fatigue Design

2012 ◽  
Vol 730-732 ◽  
pp. 555-560
Author(s):  
Daniel F.C. Peixoto ◽  
Luis A.A. Ferreira ◽  
Paulo M.S.T. de Castro
Keyword(s):  
Plastic Deformation ◽  
Cross Section ◽  
Finite Element Modelling ◽  
Element Modelling ◽  
Fatigue Design ◽  
Plastic Analysis ◽  
Constant Torsion ◽  
Strain Cycling ◽  
Small Plastic Deformation ◽  
Dang Van Criterion

The present work intends to evaluate, using simple, exemplary cases, the importance of a full elasto-plastic analysis in fatigue design. A strain cycling situation (-ε to ε) was modelled with ABAQUS considering two situations: firstly a linear σ vs. ε relationship was assumed, and secondly, the real cyclic σ vs. ε curve was used to model each cycle, which includes a small plastic deformation. The case of change of cross section in a steel shaft subjected to constant torsion and cyclic bending was analysed through finite element modelling using ABAQUS.

The Effect of Die Channel Angles and their Combination on Plastic Deformation of Pure Copper during Equal Channel Angular Pressing Using Finite Element Modelling

2019 ◽  
Vol 31 ◽  
pp. 63-69
Author(s):  
Malothu Ramulu ◽  
Arkanti Krishnaiah
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Material Flow ◽  
Finite Element Modelling ◽  
Pure Copper ◽  
Plastic Deformations ◽  
Channel Angle ◽  
Element Modelling ◽  
Angular Pressing ◽  
Strain Inhomogeneity

It was investigated the effect of die channel angles and their combination on plastic deformation of pure copper during ECAP under friction and frictionless conditions using 2-D elastic-plastic finite element modelling. A sound knowledge obtained for the plastic deformation (material flow) and understood the relationships between plastic deformations. The modelling results suggested that strain inhomogeneity was lesser in channel angle 120o than channel angle 90o and pressing load as well as strain decrease with increasing die channel angle. The friction influence in case of combination of channel angles was negligible as compare to individual channel angles. The strain generation and distribution was more uniform in case of combination of channel angles as compare to individual channel angles.

scholarly journals Modelling Machining-Induced Residual Stresses after Laser-Assisted Turning of Steels

2014 ◽  
Vol 996 ◽  
pp. 622-627 ◽  
Author(s):  
Mohamed N.A. Nasr ◽  
Mohamed Balbaa ◽  
Hassan Elgamal
Keyword(s):  
Plastic Deformation ◽  
Residual Stresses ◽  
Finite Element Modelling ◽  
Orthogonal Cutting ◽  
Thermal Softening ◽  
Heating Effect ◽  
Aisi 4340 Steel ◽  
Element Modelling ◽  
Laser Assisted Turning ◽  
Conventional Machining

The current study examines the effects of laser assistance on machining-induced residual stresses (RS), using finite element modelling, during turning of steels. Dry orthogonal cutting was modelled, along with the pre-heating effect of the laser beam. AISI 4340 steel was used in the current work. Laser-assisted machining (LAM) resulted in higher surface tensile RS compared to conventional machining, with more pronounced effects at lower feed rates. This is basically because the assisted material experienced higher plastic deformation, due to thermal softening, as well as higher temperatures, which are both attributed to the pre-heating effect of LAM.

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