| 1. |
|
|
| 2. |
|
|
| 3. |
- Issa, Sally, et al.
(författare)
-
Cohesive zone modeling of crack propagation influenced by martensitic phase transformation
- 2018
-
Ingår i: Materials Science and Engineering A. - : Elsevier BV. - 0921-5093. ; 712, s. 564-573
-
Tidskriftsartikel (refereegranskat)abstract
- A numerical model that can predict the influence of martensitic phase transformation on crack propagation is proposed. The model is comprised of a large strain plasticity model that accounts for martensitic phase transformation and a cohesive zone model to simulate the interface behavior. Different dependencies of the traction-separation law on the local volume fraction of martensite are investigated. Furthermore, as martensitic phase transformation is strongly temperature dependent, different isothermal settings are considered. It is, for example, verified that at lower temperatures, martensitic phase transformation retards crack propagation to a greater extent. It is also shown that the retarding effect depends on how the martensite dependent cohesive zone model is formulated.
|
|
| 4. |
- Issa, Sally, et al.
(författare)
-
Diagonally implicit Runge–Kutta (DIRK) integration applied to finite strain crystal plasticity modeling
- 2018
-
Ingår i: Computational Mechanics. - : Springer Science and Business Media LLC. - 0178-7675 .- 1432-0924. ; 62:6, s. 1429-1441
-
Tidskriftsartikel (refereegranskat)abstract
- Diagonally implicit Runge–Kutta methods (DIRK) are evaluated and compared to standard solution procedures for finite strain crystal plasticity boundary value problems. The structure of the DIRK implementation is similar to that of a conventional implicit backward Euler scheme. It is shown that only very small modifications are required in order to transform the numerical scheme from one into the other. This similarity permits efficient adaption of the integration procedure to a particular problem. To enforce plastic incompressibility, different projection techniques are evaluated. Rate dependent crystal plasticity, using a single crystal is simulated under various load cases as well as a larger polycrystalline sample. It is shown that the two-stage DIRK scheme combined with a step size control and a time continuous projection technique for the update of the plastic deformation gradient is in general more accurate than the implicit backward Euler and an update based on exponential mapping.
|
|
| 5. |
|
|
