PSI - Issue 42
Available online at www.sciencedirect.com Available online at www.sciencedirect.com Available online at www.sciencedirect.com
ScienceDirect
Procedia Structural Integrity 42 (2022) 806–812 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000
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© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 © 2020 The Authors. Published by Elsevier B.V. his is an open access article under the CC BY-NC-ND license (http: // creativec mmons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . Keywords: Aneurysm, Anisotropic tissue, Phase-field ; Abstract The abdominal aortic aneurysm (AAA) may have a varying degree of calcification where calcium particles are found in di ff erent geometrical configurations. The impact of calcification on the failure of aneurysms is not very clear as literature shows contradictory results. This work is dedicated to investigating the impact of calcification on the failure strength of an aneurysmatic wall using micromechanical finite element simulations. A Representative Volume Elements (RVE) consisting of circular and elliptical particles are generated with di ff erent volume fractions, which is further extruded in the thickness direction. A two-fibre model is used for modeling anisotropic tissues. Calcium particles are assumed to be elastic. An anisotropic phase-field model is employed to model the failure in the tissue. A unique set of representative material parameters as well as phase-field parameters, like critical fracture energies for isotropic and anisotropic parts, are determined by fitting the model to experimental data, available in the literature. Finite element simulations are being performed on RVEs to generate a failure envelope of the calcified tissues under bi-axial loading conditions. This study will help in better understanding and better prediction of failure in aneurysms. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . Keywords: Aneurysm, Anisotropic tissue, Phase-field ; 23 European Conference on Fracture – ECF23 Prediction of Failure Envelope of Calcified Aneurysmatic Tissue Jaynandan Kumar a , Anshul Faye a a Indian Insititute of Technology Bhilai, Raipur-492015, Chhattisgarh, India Abstract The abdominal aortic aneurysm (AAA) may have a varying degree of calcification where calcium particles are found in di ff erent geometrical configurations. The impact of calcification on the failure of aneurysms is not very clear as literature shows contradictory results. This work is dedicated to investigating the impact of calcification on the failure strength of an aneurysmatic wall using micromechanical finite element simulations. A Representative Volume Elements (RVE) consisting of circular and elliptical particles are generated with di ff erent volume fractions, which is further extruded in the thickness direction. A two-fibre model is used for modeling anisotropic tissues. Calcium particles are assumed to be elastic. An anisotropic phase-field model is employed to model the failure in the tissue. A unique set of representative material parameters as well as phase-field parameters, like critical fracture energies for isotropic and anisotropic parts, are determined by fitting the model to experimental data, available in the literature. Finite element simulations are being performed on RVEs to generate a failure envelope of the calcified tissues under bi-axial loading conditions. This study will help in better understanding and better prediction of failure in aneurysms. 23 European Conference on Fracture – ECF23 Prediction of Failure Envelope of Calcified Aneurysmatic Tissue Jaynandan Kumar a , Anshul Faye a a Indian Insititute of Technology Bhilai, Raipur-492015, Chhattisgarh, India
1. Introduction 1. Introduction
Abdominal Aortic Aneurysm(AAA) is a disease, which happens because of bulging in weaker sections of the abdominal aorta of the body. An undetected failure aneurysm can lead to serious complications. Di ff erent mathemat ical models are proposed for modeling the development of AAA and its rupture (Volokh, 2008; Kroon, 2007). The breakdown of the collagen fibres in the tissues causes the aneurysm to rupture(Balakhovsky, 2014). The mechanics of aneurysm failure can di ff er when the minerals which are mostly calcium and their salts, carbonates and a high percent age of proteins are deposited on the walls of the aneurysm. (Schmid, 1980). Micron sized calcium particles are found in di ff erent shape and geometrical structures like spherical, cubical, strips, and flakes (He et al., 2017; Marra et al., 2006). A large variation in the strength of the calcified aneurysm tissues is reported in the literature (Raghavan, 2000; Abdominal Aortic Aneurysm(AAA) is a disease, which happens because of bulging in weaker sections of the abdominal aorta of the body. An undetected failure aneurysm can lead to serious complications. Di ff erent mathemat ical models are proposed for modeling the development of AAA and its rupture (Volokh, 2008; Kroon, 2007). The breakdown of the collagen fibres in the tissues causes the aneurysm to rupture(Balakhovsky, 2014). The mechanics of aneurysm failure can di ff er when the minerals which are mostly calcium and their salts, carbonates and a high percent age of proteins are deposited on the walls of the aneurysm. (Schmid, 1980). Micron sized calcium particles are found in di ff erent shape and geometrical structures like spherical, cubical, strips, and flakes (He et al., 2017; Marra et al., 2006). A large variation in the strength of the calcified aneurysm tissues is reported in the literature (Raghavan, 2000;
∗ Corresponding author. Tel.: + 91-8962813770 ; fax: + 0-000-000-0000. E-mail address: jaynandank@iitbhilai.ac.in ∗ Corresponding author. Tel.: + 91-8962813770 ; fax: + 0-000-000-0000. E-mail address: jaynandank@iitbhilai.ac.in
2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.102 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 .
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