Some Issues on Crystal Plasticity Models Formulation: Motion Decomposition and Constitutive Law Variants
Abstract
:1. Introduction
2. Some Well-Known Variants of Base Mesolevel Relations
2.1. Relations in Terms of the Unloaded Configuration (U-Model)
2.2. Relations in Terms of the Actual Configuration with a Taylor Spin (T-Model)
2.3. Analysis of the Formulations with an Emphasis on Describing Geometric Nonlinearity and Fulfillment of Thermodynamic Constraints
3. Modification of Mesolevel Relations with an Explicit Separation of the Rigid Moving Coordinate System with Respect to Which Elastic Distortion Is Defined
3.1. Relations in Terms of Lattice Unloaded Configuration (LU-Model)
3.2. Rate Form Relations in Terms of the Actual Configuration (LR-Model)
4. Results and Discussion
4.1. Analytical Comparison
4.2. Illustrative Numerical Examples
5. Conclusions
- clear physical meaning of the stress tensor, which simplifies simulations with evolutionary hardening equations;
- use of the clear measure of the strain rate (the stretching tensor) and the possibility of an additive decomposition of the strain rate into contributions from various mechanisms;
- ease of their use in the rate formulation of the boundary value problem under varying, a priori unknown, contact boundary conditions.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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U | T | LU | LR1 | LR2 | GN | |
---|---|---|---|---|---|---|
U | ≈ (described in Section 4.1, follows from U ≈ GN ≈ T) | = (shown in Section 4.1) | ≈ (shown in Section 4.1, described in Section 3.2, follows from U = LU ≈ LR1) | ≈ (shown in Section 4.1, described in Section 3.2, follows from U = LU ≈ LR2) | ≈ (described in Section 4.1, S by analogy with LU ≈ LR1) | |
T | ≈ (described in Section 4.1, follows from LU = U ≈ GN ≈ T) | ≈ (described in Section 4.1, follows from LR1 ≈ LU = U ≈ ≈ GN ≈ T) | ≈ (described in Section 4.1, follows from LR2 ≈ LU = U ≈ ≈ GN ≈ T) | ≈ described in Section 4.1) | ||
LU | ≈ (described in Section 3.2) | ≈ (described in Section 3.2) | ≈ (described in Section 4.1, follows from LU = U ≈ GN) | |||
LR1 | ≈ (described in Section 3.2) | ≈ (described in Section 4.1, follows from LR1 ≈ LU = = U ≈ GN) | ||||
LR2 | ≈ (described in Section 4.1, follows from LR2 ≈ LU = = U ≈ GN) |
Model | U | T | LU | LR1 | LR2 | GN |
---|---|---|---|---|---|---|
, MPa | 0 | 2.94 | 0 | 2.935 | 2.752 | 2.954 |
0 | 0.013834 | 0 | 0.013813 | 0.012948 | 0.013903 |
Model | U | T | LU | LR1 | LR2 | GN |
---|---|---|---|---|---|---|
, MPa | 0 | 2.854 | 0 | 2.775 | 3.859 | 2.964 |
0 | 0.01145 | 0 | 0.011132 | 0.015481 | 0.011891 |
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Trusov, P.; Shveykin, A.; Kondratev, N. Some Issues on Crystal Plasticity Models Formulation: Motion Decomposition and Constitutive Law Variants. Crystals 2021, 11, 1392. https://doi.org/10.3390/cryst11111392
Trusov P, Shveykin A, Kondratev N. Some Issues on Crystal Plasticity Models Formulation: Motion Decomposition and Constitutive Law Variants. Crystals. 2021; 11(11):1392. https://doi.org/10.3390/cryst11111392
Chicago/Turabian StyleTrusov, Peter, Alexey Shveykin, and Nikita Kondratev. 2021. "Some Issues on Crystal Plasticity Models Formulation: Motion Decomposition and Constitutive Law Variants" Crystals 11, no. 11: 1392. https://doi.org/10.3390/cryst11111392