Implementation of Ductile Damage Models to Determine Constraint Parameters for Ductile Materials-Phase 1 (Generic Constraint Conditions)

2021 ◽  
Author(s):  
Jack Beswick ◽  
Peter James ◽  
John Sharples
Keyword(s):  
Phase 1 ◽  
Ductile Damage ◽  
Ductile Materials ◽  
Damage Models

Comparison of Ductile Damage Models

2001 ◽  
Vol 4 (3-4) ◽  
pp. 303-318 ◽  
Author(s):  
Cyril Bordreuil ◽  
Emmanuelle Vidal-Sallé ◽  
Jean-Claude Boyer ◽  
Antonio Bugini
Keyword(s):  
Ductile Damage ◽  
Damage Models

scholarly journals A Comparative Study of Ductile Damage Models Approaches for Joint Strength Prediction in Hot Shear Joining Process

2017 ◽  
Vol 207 ◽  
pp. 1689-1694 ◽  
Author(s):  
Mohanraj Murugesan ◽  
Seonggi Lee ◽  
Dongwook Kim ◽  
Youn-Hee Kang ◽  
Naksoo Kim
Keyword(s):  
Comparative Study ◽  
Joint Strength ◽  
Ductile Damage ◽  
Strength Prediction ◽  
Damage Models ◽  
Joining Process

Studies on Ductile Damage and Flow Instabilities during Hot Deformation of a Multiphase γ-TiAl Alloy

2014 ◽  
Vol 611-612 ◽  
pp. 99-105 ◽  
Author(s):  
Dilek Halici ◽  
Hassan Adrian Zamani ◽  
Daniel Prodinger ◽  
Cecilia Poletti ◽  
Daniel Huber ◽  
...  
Keyword(s):  
Hot Deformation ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Turbine Blades ◽  
Shear Bands ◽  
Flow Instabilities ◽  
Ductile Damage ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium ◽  
Damage Models

Gamma titanium aluminides are promising alloys for low-pressure turbine blades. A significant disadvantage of such intermetallic alloys is failure induced during forming processes due to ductile damage and flow instabilities. Previous investigations on a gamma titanium aluminide alloy (TNM), have shown ductile damage due to tensile stress components and instabilities such as shear bands, pores and micro-cracks at low temperatures and high strain rates. The main part of the current work is to delineate damage and unstable regions in the low temperature region. Hot deformation experiments are conducted on a Gleeble®3800 thermomechanical treatment simulator to obtain flow curves to be implemented in a finite element method (FEM) code. Instabilities in the material are described by existing instability criteria as proposed by Semiatin and Jonas and implemented into FEM code DEFORMTM 2D. Predictions of ductile damage models and the instability parameter are validated through detailed microstructural studies of deformed specimens analysed by light optical- and scanning electron microscopy.

scholarly journals Prediction of fracture limits of Ni–Cr based alloy under warm forming condition using ductile damage models and numerical method

2021 ◽  
Vol 31 (8) ◽  
pp. 2372-2387
Author(s):  
Ayush MORCHHALE ◽  
Anand BADRISH ◽  
Nitin KOTKUNDE ◽  
Swadesh Kumar SINGH ◽  
Navneet KHANNA ◽  
...  
Keyword(s):  
Numerical Method ◽  
Warm Forming ◽  
Ductile Damage ◽  
Damage Models ◽  
Forming Condition

Implementation of Ductile Damage Models to Determine Constraint Parameters for Ductile Materials: Phase 1 — Generic Constraint Conditions

2020 ◽  
Author(s):  
J. Beswick ◽  
P. James ◽  
J. Sharples
Keyword(s):  
Boundary Layer ◽  
Fracture Toughness ◽  
Yield Surface ◽  
Void Growth ◽  
Layer Model ◽  
Gtn Model ◽  
Ductile Materials ◽  
Damage Models ◽  
Boundary Layer Model ◽  
T Stress

Abstract It has been observed that steels which are operating in the ductile regime demonstrate greater resistance to tearing under conditions of reduced crack-tip constraint. Constraint is influenced by both geometry and load conditions. For example, fracture toughness specimens with shorter cracks relative to wall thickness, or those subjected to tension as opposed to bending, will demonstrate reduced constraint. Constraint may be quantified by an elastic T-Stress or the elastic-plastic Q parameter. R6, a set of structural integrity guidelines widely used in the nuclear industry, suggests that the effective fracture toughness of a material at reduced constraint may be calculated using a material-specific toughness locus. To define this locus, it is usually necessary to perform laboratory tests on the material at various levels of constraint, which are both expensive and time consuming. For cleavage (low-temperature) fracture, it is also possible to consult look-up tables, which require the calculation of the Weibull stress parameter. This paper details findings from an investigation into a method to determine the parameters defining failure loci for steels. The work involves the use of finite element analysis and two damage models which consider void growth in ductile materials. The first model is the Rice and Tracey model, which determines void growth based on stress triaxiality and plastic strain, and the second is the GTN local approach, which considers void initiation, growth and coalescence to define a yield surface for the material. The yield surface is governed by numerous parameters which enable the definition of the void volume fraction of the material at the various stages preceding fracture. Previous work has demonstrated independence of the parameters used to define the toughness loci to the critical void size when defined using the Rice and Tracey approach. The work presented in this paper demonstrates similar behaviour using the GTN model, with independence of the constraint benefit to the governing parameters. The toughness determined using the GTN approach is calculated from J-R type curves obtained by simulating crack growth in idealised constraint scenarios: specifically applying a T-Stress to boundary layer models, where a boundary layer model is an idealised high constraint scenario. It is shown in this paper that, whilst independence is demonstrated to the GTN parameters, there are discrepancies between the toughness loci derived using the GTN model and those using the Rice and Tracey approach. The reasons for this are discussed and are predicted to be due to load order effects, in that constraint reduces through loading, which may not be captured accurately using the boundary layer model. An introduction to the next phase of work, which does accurately include these effects, is also provided.

scholarly journals On the regularization for ductile damage models

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Kai Langenfeld ◽  
Kerstin Möhring ◽  
Frank Walther ◽  
Jörn Mosler
Keyword(s):  
Ductile Damage ◽  
Damage Models

Prediction of fracture limits of IN625 alloy by coupling ductile damage models and anisotropic yielding functions with the classical Marciniak and Kuczyński model

2021 ◽  
pp. 095440542110518
Author(s):  
Ayush Morchhale ◽  
Nitin Kotkunde ◽  
Swadesh Kumar Singh ◽  
Navneet Khanna
Keyword(s):  
Manufacturing Industry ◽  
Forming Limit Diagram ◽  
Ductile Damage ◽  
Inconel 625 ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Forming Limits ◽  
Damage Models ◽  
Uniaxial Tensile Testing ◽  
Anisotropic Yielding

The fracture forming limit diagram (FFLD) is gaining special attention in high strength materials where the necking tendency rarely occurs during sheet metal forming processes. In the present work, the classical Marciniak and Kuczyński (MK) model has been modified by coupling it with different ductile damage models (Cockcroft and Latham, Brozzo, Oyane, Ko, Oh, Rice and Tracey, McClintock and Clift) and anisotropic yielding functions (Hill 1948 and Barlat 1989) to predict the fracture limits of Inconel 625 (IN625) alloy at different temperatures. Firstly, uniaxial tensile testing has been conducted for the determination of important mechanical properties. Consequently, stretch forming experiments have been performed to analyze the forming limits of a material. It has been found that the safe and fracture forming limits of the material increased by approximately 17.26% and 22.22%, respectively, on increasing the temperature from 300 to 673 K. From the comparative analysis of different combinations of ductile damage models and yielding functions, the Cockcroft and Latham (C-L) damage model in combination with the Barlat 1989 yielding function helped in best predicting the theoretical FFLD as it displayed the least average root mean square error (RMSE) of 0.033. The other ductile damage models used for predicting the theoretical fracture limits displayed large error; hence, they should not be considered while designing a critical component in the manufacturing industry using IN625 alloy.

scholarly journals A comparison of ductile damage models with application to LCF

PAMM ◽  
2009 ◽  
Vol 9 (1) ◽  
pp. 205-206
Author(s):  
Olaf Kintzel
Keyword(s):  
Ductile Damage ◽  
Damage Models

A hybrid approach for modelling of plasticity and failure behaviour of advanced high-strength steel sheets

2012 ◽  
Vol 22 (2) ◽  
pp. 188-218 ◽  
Author(s):  
J Lian ◽  
M Sharaf ◽  
F Archie ◽  
S Münstermann
Keyword(s):  
Damage Evolution ◽  
Damage Mechanics ◽  
Hybrid Approach ◽  
High Strength Steels ◽  
High Strength ◽  
Numerical Approach ◽  
Ductile Damage ◽  
Dissipation Energy ◽  
Damage Models ◽  
Steel Sheets

The ductile damage mechanisms dominating in modern high-strength steels have emphasised the significance of the onset of damage and the subsequent damage evolution in sheet metal forming processes. This paper contributes to the modelling of the plasticity and ductile damage behaviour of a dual-phase steel sheet by proposing a new damage mechanics approach derived from the combination of different types of damage models. It addresses the influence of stress state on the plasticity behaviour and onset of damage of materials, and quantifies the microstructure degradation using a dissipation-energy-based damage evolution law. The model is implemented into ABAQUS/Explicit by means of a user material subroutine (VUMAT) and applied to the subsequent numerical simulations. A hybrid experimental and numerical approach is employed to calibrate the material parameters, and the detailed program is demonstrated. The calibrated parameters and the model are then verified by experiments at different levels, and a good agreement between the experimental and numerical results is achieved.

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