scholarly journals Lipschitz regularization for softening material models: the Lip-field approach

2021 ◽  
Vol 349 (2) ◽  
pp. 415-434
Author(s):  
Nicolas Moës ◽  
Nicolas Chevaugeon
Keyword(s):  
Material Models ◽  
Field Approach ◽  
Softening Material ◽  
Lipschitz Regularization

Gradient-enhanced softening material models

2009 ◽  
Vol 25 (11) ◽  
pp. 2094-2121 ◽  
Author(s):  
L.H. Poh ◽  
S. Swaddiwudhipong
Keyword(s):  
Material Models ◽  
Softening Material

Prediction of Machining Induced Surface Integrity Using Elastic-Viscoplastic Simulations and Temperature-Dependent Flow Softening Material Models in Titanium and Nickel-Based Alloys

2011 ◽  
Vol 223 ◽  
pp. 401-410 ◽  
Author(s):  
Durul Ulutan ◽  
Mohammad Sima ◽  
Tugrul Özel
Keyword(s):  
Residual Stresses ◽  
Surface Integrity ◽  
Flank Wear ◽  
Flow Softening ◽  
Temperature Dependent ◽  
Material Models ◽  
Softening Material ◽  
Stress Profiles ◽  
Dependent Flow ◽  
Constitutive Material

In this study, the feasibility of predicting surface integrity and residual stresses by using elasto-viscoplastic finite element simulations and temperature-dependent flow softening constitutive material modeling is investigated. A friction determination method is proposed to identify friction coefficients in presence of tool flank wear. Serrated and cyclical chip formation has been simulated for using tools with and without flank wear. The predicted residual stresses and surface integrity is compared against experimental results from literature. Effect of friction on the residual stress profiles is also investigated. These results are highly essential in predicting machining induced microstructure alterations that are detrimental to fatigue life of nickel and titanium alloy components.

On the Uniqueness of Solution of the Initial Value Problem in Softening Materials

1985 ◽  
Vol 52 (3) ◽  
pp. 649-653 ◽  
Author(s):  
K. C. Valanis
Keyword(s):  
Constitutive Equation ◽  
Unique Solution ◽  
Initial Value Problem ◽  
Constitutive Equations ◽  
Uniqueness Of Solution ◽  
Initial Value ◽  
Material Models ◽  
Softening Behavior ◽  
Softening Material

The initial value problem in finite “softening” material domains is discussed. An inequality that is true of all materials irrespective of their constitution is first established. It is then shown that the solution to this problem is unique when the attending constitutive equation satisfies another inequality, which is characteristic of material models that we call “positive.” A number of constitutive equations that give rise to realistic softening behavior are shown to lead to a unique solution of the initial value problem.

Full-Field Approach for Modeling of Microstructural Evolutions During Forming Processes

2019 ◽  
Author(s):  
S. Andrietti ◽  
M. Bernacki ◽  
N. Bozzolo ◽  
L. Maire ◽  
P. De Micheli ◽  
...  
Keyword(s):  
Full Field ◽  
Field Approach

Challenges Towards Developing a High Fidelity Database for Validating High Strain Rate Composite Material Models

2021 ◽  
Author(s):  
Mark Pankow ◽  
Joseph Giliberto ◽  
Brandon Hearley ◽  
Brian Justusson ◽  
Joseph Schaefer ◽  
...  
Keyword(s):  
Composite Material ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
High Fidelity ◽  
Material Models

scholarly journals On the Plastic Strain Accumulation in Notched Bars During High-Temperature Creep Dwell

2020 ◽  
Vol 36 (2) ◽  
pp. 167-176 ◽  
Author(s):  
Daniele Barbera ◽  
Haofeng Chen
Keyword(s):  
High Temperature ◽  
Cyclic Loading ◽  
Plastic Strain ◽  
Kinematic Hardening ◽  
High Temperature Creep ◽  
Strain Accumulation ◽  
Material Models ◽  
Cyclic Loading Condition ◽  
Hardening Material ◽  
Temperature Creep

ABSTRACTStructural integrity plays an important role in any industrial activity, due to its capability of assessing complex systems against sudden and unpredicted failures. The work here presented investigates an unexpected new mechanism occurring in structures subjected to monotonic and cyclic loading at high temperature creep condition. An unexpected accumulation of plastic strain is observed to occur, within the high-temperature creep dwell. This phenomenon has been observed during several full inelastic finite element analyses. In order to understand which parameters make possible such behaviour, an extensive numerical study has been undertaken on two different notched bars. The notched bar has been selected due to its capability of representing a multiaxial stress state, which is a practical situation in real components. Two numerical examples consisting of an axisymmetric v-notch bar and a semi-circular notched bar are considered, in order to investigate different notches severity. Two material models have been considered for the plastic response, which is modelled by both Elastic-Perfectly Plastic and Armstrong-Frederick kinematic hardening material models. The high-temperature creep behaviour is introduced using the time hardening law. To study the problem several results are presented, as the effect of the material model on the plastic strain accumulation, the effect of the notch severity and the mesh element type and sensitivity. All the findings further confirm that the phenomenon observed is not an artefact but a real mechanism, which needs to be considered when assessing off-design condition. Moreover, it might be extremely dangerous if the cyclic loading condition occurs at such a high loading level.

Comparison between elastic and porous elastic material models for sediment acoustical behavior in an aluminum-sediment double layer

2021 ◽  
Vol 43 (5) ◽  
Author(s):  
Omid Bahrami Khameslouie ◽  
Mohammad Hossein Soorgee ◽  
Ehsan Ghafarallahi ◽  
Seyed Ebrahim Moussavi Torshizi
Keyword(s):  
Double Layer ◽  
Elastic Material ◽  
Material Models

scholarly journals Inhomogeneous mean-field approach to collective excitations near the superfluid-Mott glass transition

2021 ◽  
pp. 168526
Author(s):  
Martin Puschmann ◽  
João C. Getelina ◽  
José A. Hoyos ◽  
Thomas Vojta
Keyword(s):  
Glass Transition ◽  
Mean Field ◽  
Collective Excitations ◽  
Field Approach
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