Details
| Original language | English |
|---|---|
| Article number | 100506 |
| Pages (from-to) | 19-33 |
| Number of pages | 15 |
| Journal | Shape Memory and Superelasticity |
| Volume | 11 |
| Issue number | 1 |
| Early online date | 18 Feb 2025 |
| Publication status | Published - Mar 2025 |
Abstract
Shape memory alloys are complex materials with unique properties. Their appropriate modeling necessitates thermomechanically coupled approaches. A numerically robust and efficient material model that is based on energy principles has been presented in previous studies. The present work demonstrates its applicability to complex loading scenarios. To this end, the placement of a stent in a narrowed artery which damages is simulated. For the stent, a Nitinol material model is used and contact conditions between the stent and the artery wall are considered which introduce highly nonlinear kinematic constraints on the displacement field. Furthermore, the artery is modeled by Neo-Hookean hyperelasticity, including damage evolution. Gradient enhancement is included for regularization purposes. Hence, the presented numerical studies not only prove the applicability of both models to highly nonlinear simulation scenarios, they further allow for the investigation of stent-induced arterial injury. The latter, in turn, is known to initiate inflammatory responses in arteries which can lead to pathologic tissue responses. Concluding, both models can contribute to the investigation of new stent designs and stent–artery interactions to reduce arterial injury after cardiovascular interventions.
Keywords
- Complex finite element simulations, Damage modeling, Finite differences approach, NEM, Shape memory modeling, Variational material modeling
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
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In: Shape Memory and Superelasticity, Vol. 11, No. 1, 100506, 03.2025, p. 19-33.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nitinol Stent Placement in a Stenosed Artery
T2 - A Highly Nonlinear Application Scenario for Two Novel Finite-Element Models
AU - Gierig, Meike
AU - Liu, Fangrui
AU - Junker, Philipp
N1 - Publisher Copyright: © The Author(s) 2025.
PY - 2025/3
Y1 - 2025/3
N2 - Shape memory alloys are complex materials with unique properties. Their appropriate modeling necessitates thermomechanically coupled approaches. A numerically robust and efficient material model that is based on energy principles has been presented in previous studies. The present work demonstrates its applicability to complex loading scenarios. To this end, the placement of a stent in a narrowed artery which damages is simulated. For the stent, a Nitinol material model is used and contact conditions between the stent and the artery wall are considered which introduce highly nonlinear kinematic constraints on the displacement field. Furthermore, the artery is modeled by Neo-Hookean hyperelasticity, including damage evolution. Gradient enhancement is included for regularization purposes. Hence, the presented numerical studies not only prove the applicability of both models to highly nonlinear simulation scenarios, they further allow for the investigation of stent-induced arterial injury. The latter, in turn, is known to initiate inflammatory responses in arteries which can lead to pathologic tissue responses. Concluding, both models can contribute to the investigation of new stent designs and stent–artery interactions to reduce arterial injury after cardiovascular interventions.
AB - Shape memory alloys are complex materials with unique properties. Their appropriate modeling necessitates thermomechanically coupled approaches. A numerically robust and efficient material model that is based on energy principles has been presented in previous studies. The present work demonstrates its applicability to complex loading scenarios. To this end, the placement of a stent in a narrowed artery which damages is simulated. For the stent, a Nitinol material model is used and contact conditions between the stent and the artery wall are considered which introduce highly nonlinear kinematic constraints on the displacement field. Furthermore, the artery is modeled by Neo-Hookean hyperelasticity, including damage evolution. Gradient enhancement is included for regularization purposes. Hence, the presented numerical studies not only prove the applicability of both models to highly nonlinear simulation scenarios, they further allow for the investigation of stent-induced arterial injury. The latter, in turn, is known to initiate inflammatory responses in arteries which can lead to pathologic tissue responses. Concluding, both models can contribute to the investigation of new stent designs and stent–artery interactions to reduce arterial injury after cardiovascular interventions.
KW - Complex finite element simulations
KW - Damage modeling
KW - Finite differences approach
KW - NEM
KW - Shape memory modeling
KW - Variational material modeling
UR - http://www.scopus.com/inward/record.url?scp=85218137123&partnerID=8YFLogxK
U2 - 10.1007/s40830-025-00525-0
DO - 10.1007/s40830-025-00525-0
M3 - Article
AN - SCOPUS:85218137123
VL - 11
SP - 19
EP - 33
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
SN - 2199-384X
IS - 1
M1 - 100506
ER -