This work presents the numerical assessment of the deformation of an artery wall with and
without an aneurism. The simulations consider the hyper-elastic behaviour of the artery
tissues, taken in consideration the properties of polydimethylsiloxane (PDMS), which are
more similar to the biological tissues. The numerical simulations were performed using the
commercial finite element routines ANSYS®, by considering the inner the artery fluid flow
and the consequent pressure is used to simulate the wall deformation.info:eu-repo/semantics/publishedVersio

Gomes, J.F.S.

Lima, R.

Lopes, H.

Ribeiro,  J.E.

Vaz, M.A.P.

Lima, Rui A.

Lopes, Hernani

Gomes, J.F. Silva

Biblioteca Digital do IPB

Numerical simulation of wall deformation in an aneurysm model

This work presents the numerical deformation of an artery wall with and without an aneurism. The simulations consider the hyper-elastic behaviour of the artery tissues, taken in consideration the properties of polydimethylsiloxane (PDMS), which are more similar to the biological tissues. The numerical simulations were performed using the commercial finite element method ANSYS®, by considering the inner the artery fluid flow and the consequent pressure is used to simulate the wall deformation.info:eu-repo/semantics/publishedVersio

M2D2015 P. Delgada/Portugal  6th International Conference on MECHANICS AND MATERIALS IN DESIGN P. Delgada/Azores, 26-30 July 2015 M2D2015  PROGRAM  University of Porto University of Toronto University of AzoresM2D’2015 P. Delgada/Portugal 6th International Conference on MECHANICS AND MATERIALS IN DESIGN P. Delgada/Azores, 26-30 July 2015   - 12 - 14:00-19:00 POSTERS SESSION - 3 TOPICS: B, G, H, K ;   SYMPOSIA:  6, 19, 21 Lobby  Topic: B Ref: 5372 STUDY OF WELDING LINE UNRIPPING TEST OF METAL BELLOWS. Zhongbin Tang, Yulong Liu, Tao Suo, Qiong Deng Ref: 5466 ANALYSIS OF THE AIRCRAFT OPERATION IN THE CONTEXT OF SAFETY AND EFFECTIVENESS. Jozef Zurek, Antoni Jankowski, Jan Rajchel Ref: 5544 REMARKS TO TESTING OF STRENGTH AND FATIGUE LIFE. Miloslav Kepka, Jan Chvojan Ref: 5581 INFLUENCY OF HEAT TREATMENT IN THE MECHANICAL PROPERTIES AT HIGH TEMPERATURES OF P91 STEEL-PIPE WELDED JOINTS. Tatiane Chuvas, António Correia da Cruz, Manuel Gomes, Maria Cindra Fonseca Ref: 5645 VANE SEGMENT CASTING GEOMETRY IMPACT ON THE STRESS IN THE AIRFOIL SURFACE LAYER. Pawel Kocurek, Pawel Rokicki, Rafal Cygan, Jacek Nawrocki, Andrze Nowotnik, Jan Sieniawski Ref: 5653 HEAT TREATMENT EFFECT ON MICROSTRUCTURE AND PROPERTIES OF SINGLE CRYSTAL CMSX-4® NICKEL-BASED SUPERALLOY. Andrzej Nowotnik, Pawel Rokicki, Grzegorz Jakubowicz, Daniel Kurkowski, Grazyna Mrowka-Nowotnik, Malgorzata Wierzbinska, Jan Sieniawski, Jacek Nawrocki Ref: 5674 FATIGUE BEHAVIOR AND CUMULATIVE DAMAGE OF NOTCHED GFR COMPOSITES. Alessio Carofalo, Vito Dattoma, Riccardo Nobile, Fania Palano, Francesco Panella Ref: 5693 INVESTIGATION OF THE MECHANICAL BEHAVIOUR OF ZIRCONIUM ALLOY AT DIFFERENT STRAIN RATES USING SUB-SIZE TENSILE SPECIMENS. Pavel Konopik, Martin Rund, Jan Dzugan Ref: 5775 TOOL CONDITION MONITORING IN DRILLING BASED ON SPINDLE AND FEED MOTOR CURRENT. Alfonso González, David Rodríguez, Justo García Sanz-Calcedo, Inocente Cambero, José Herrera Topic: G Ref: 5352 SMALL-SCALE STRAIGHT-BLADED DARRIEUS VERTICAL AXIS WIND TURBINE. Rafael de Almeida Alves, Carlos Alberto Gallo Ref: 5454 LIFE CYCLE ANALYSIS (LCA) AND RELIABILITY TECHNIQUES IN INDUSTRIAL DESIGN PROJECTS. Justo Calcedo, David Salgado, Alfonso Gonzalez, Inocente Rivero, José Herrera Ref: 5603 CONSIDERATIONS ON OPERATION OF A TURBOJET ENGINE WITH THE 'BYPASS' DESIGN. Miroslaw Kowalski Ref: 5760 SPATIAL FACE RACK DRIVES: MATHEMATICAL MODELS FOR SYNTHESIS AND SOFTWARE ILLUSTRATIONS. Emilia Abadjieva Topic: H Ref: 5410 THREE-DIMENSIONAL EFFECTS ON WELDED LAP JOINTS UNDER TENSILE-SHEAR LOADING. Filippo Berto, Alberto Campagnolo Ref: 5667 EVALUATION OF STAINLESS STEEL PLATES OF HEAT EXCHANGER DAMAGE. H. Abdel-Aleem, B. Zaghloul, S.A. Khodir Topic: K Ref: 5584 MEASUREMENT OF INPUT ACOUSTIC IMPEDANCE OF HUMAN AUDITORY SYSTEM. Daniel Carmona, Leonardo Molisani, Maria Bellini Ref: 5696 ANALYSIS OF THE CORE STABILITY TO IMPROVE SINGLE LEG STANCE (CASE STUDY). Ana Couto, Mário Vaz, Sara Morais Symp: 6 Ref: 5618 NUMERICAL SIMULATION OF WALL DEFORMATION IN AN ANEURYSM MODEL. João Ribeiro, Rui Lima, Hernani Lopes, Mário Vaz, J.F. Silva Gomes Symp:19 Ref: 5407 MAGNETIC CHARACTERIZATION BY EDDY CURRENT TESTING TO EVALUATE THE AGED MICROSTRUCTURE OF REFORMER FURNACE TUBES. João Rebello, M. Arenas, M.C.L. Areiza, L.H. Almeida, R. Sacramento, G.R. Pereira Ref: 5420 MEASUREMENT OF RESIDUAL STRESSES IN WELDED ELEMENTS AND STRUCTURES BY ULTRASONIC METHOD. Yuri Kudryavtsev, Jacob Kleiman, Lana Potapova Ref: 5447 MINIATURIZED SAMPLES CREEP TEST AS A NON DESTRUCTIVE SOLUTION. Heloisa Furtado, Fernanda Santos, Luiz Almeida, Luisa Coutino Ref: 5532 INFLUENCE OF SUPERALLOY CASTING STRUCTURE ON PROPAGATION OF ULTRASONIC WAVE. Jacek Nawrocki, Kamil Gancarczyk, Wojciech Manaj, Robert Albrecht, Rafal Cygan, Krzysztof Krupa, Jan Sieniawski Ref: 5661 EVALUATION OF FATIGUE PROPERTIES OF NICKEL BASED SUPERALLOY MAR 247 WITH ALUMINIDE COATING AND CRACK DETECTION BY NON-DESTRUCTIVE TECHNIQUES. Dominik Kukla Symp: 21 Ref: 5675 MACHINED SURFACE ANALYSIS AT HIGH CUTTING SPEED USING CARBIDE DRILL IN A AL-SI ALLOY. Paulo S. Martins, José R.G. Carneiro, Gilmar C. Silva, Pedro P. Brito  19:30-24:00 CONFERENCE BANQUET Coliseu Micaelense   NUMERICAL SIMULATION OF WALL DEFORMATION IN AN ANEURYSM MODELRibeiro1, J., Lima2, R., Lopes3, H., Vaz4, M., Gomes4, J.1ESTIG – Polytechnic Institute of Bragança; 2DEM –University of Minho; 3ISEP – Polytechnic Institute of Porto;  4DEMEGI – University of Porto1- INTRODUCTIONAneurysms are the fourth most common cause of cerebrovascular disease in adults, after theischemic attacks, thrombotic and hypertensive cerebral hemorrhage. In Europe, the cerebrovasculardiseases is the leading cause of mortality (Branco, 1992). The causes for the occurrence ofaneurysms is the deterioration of the arterial wall is the hypertension. Other causes includehereditary connective tissue disease, congenital cardiovascular abnormalities or atherosclerosis.The most common approach for the study of aneurysms behavior is made from analysis of the bloodflow in this region and deformation produced by blood pressure. One of the key features in this studyis the definition of the arteries tissues mechanical properties. Some studies have shown that arterialtissues have a typical hyper-elastic behavior (Masson, 2008).2- NUMERICAL SIMULATIONS The numerical simulation are made using Finite Volume Method (FVM) and finite element method(FEM) , commercial package simulation software ANSYS ®.The numerical simulations were accomplished in two steps. In the first, is analyzed the fluid flowinner the channel. The second, is based on the structural deformation analysis due to the internalpressure of fluid. In Fig. 1 and 2 are represented the geometries used for both simulations3- RESULTSIn Fig. 5 is represented the fluid velocity field in the aneurysm model.In the Fig. 6 is shown the displacement field caused by internal pressure when fluid passes insidethe channel.4- CONCLUSIONSObserving the velocity profile obtained from the numerical simulation it is concluded that the velocityincrease from zero on the wall until the maximum into the center channel. If one looks at fluid flow, itis observed that the flow is laminar over the channel. However, in the aneurysm region there is achange in the flow conditions, passing from laminar to turbulent flow.Analyzing the results, it is apparent that the expansion of the aneurysm is predominant at theirlateral regions and, for that reason, the greatest strain occur precisely in these areas, being the highrisk of rupture.REFERENCESBranco G, Miguel J, Goulão A, Maurício JC, Diagnóstico Angiográfico dos Aneurismas Intracranianos:Estudo Sobre a Experiência do Serviço de Neurologia do Hospital Egas Moniz, Acta Médica Portuguesa,1992, 5, p.515-518.Masson I, Boutouyrie P, Laurent S, Humphrey JD, Zidi M, Characterization of arterial wall mechanicalbehavior and stresses from human clinical data, Journal of Biomechanics, 2008, 41(12), p. 2618–2627.CONTACT INFORMATION6th International Conference on Mechanics and Materials in Design, Ponta Delgada/Portugal, 26-30 July 2015João Ribeiro – jribeiro@ipb.pt.6th International Conference on Mechanics and Materials in Design, Ponta Delgada/Portugal, 26-30 July 2015In the Fig. 7 is presented the total and the Euclidean strain field components.Figure 5 - Fluid velocity vectors. All model (a) and in aneurysm region (b)Figure 6 - Displacement field in the channel with aneurysm: a) total displacement; b) in the X direction; c) in the direction Y; d) in Y direction seen in the other side; e) in the direction Z; f) in Z direction seen in the other side.Figure 7 - Strain field of the channel with aneurysm: a) Total strain; b) in the X direction; c) in the direction Y; d) in Y direction (seen from opposite side); e) in the Z direction; f) in the Z direction (seen in from opposite side).Figure 3 - Mesh used for the inside of the channel.For fluid flow simulation was used the Fluent module of the Ansys® and for wall deformation wassimulated using the Structural module.Simulations of fluid flows were performed for glycerol 60%, which features well known propertiesand sufficient viscosity to measure the pressure drops. At temperature of 20°C, the properties ofthis fluid are: density (ρ) of 1153.8 kg/m3 and viscosity (ղ) equal to 1.08e-2 Pa.s. The imposedsimulation conditions were: boundary conditions, no slip at the wall, a constant velocity inlet and thevolumetric flow rate was 300 µl/min. The mesh presented in Fig. 3 is based on CutCell method, withan element size equal to 0.25mm, having a total of 352045 nodes and 344508 elements.In the structural simulation was considered the PDMS material. This material has a hyperleasticbehavior, which was implemented using the numerical model of Mooney-Rivlin. The mesh used forthe discretization of outer part, Fig.4, has an element size of 0.90mm, being a total mesh form by42898 nodes and 24045 elements.Figure 1 - Dimensions of the inside part, for the study of fluid flow.Figure 2 – Outer part dimensions, for the study of the mechanical behavior of the channel.Figure 4 - Mesh used for the outer part of the channel (wall).

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Numerical simulation of wall deformation in an aneurysm model

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