Tire-Soil Modeling Using Finite Element Analysis and Smooth Particle Hydrodynamics Techniques

2010 ◽  
Author(s):  
Ryan Lescoe ◽  
Moustafa El-Gindy ◽  
Kevin Koudela ◽  
Fredrik O¨ijer ◽  
Mukesh Trivedi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Particle Density ◽  
Soft Soil ◽  
Rolling Resistance ◽  
Sensitivity Study ◽  
Partial Replacement ◽  
Smooth Particle Hydrodynamics ◽  
Element Analysis ◽  
Particle Hydrodynamics

New soil models for a tire-soil interaction are developed and compared. A rigid tire model is used to perform an extensive sensitivity study on the previously used Finite Element Analysis (FEA) soft soil (dense sand) to determine the importance of mesh size, soil plot size, and edge constraints. Furthermore, parameters for Smooth Particle Hydrodynamics (SPH) particles are determined for either complete or partial replacement of FEA elements in the soil model. Rolling resistance tests are then conducted for different FEA, SPH, and FEA/SPH soil models. Replacement of FEA elements with SPH particles is isolated as a variable and it is found that using a deeper amount of SPH particles increases rolling resistance while increasing the SPH particle density has little effect on rolling resistance.

Effect of the Inhomogeneity of a Substratum Soil on Longitudinal Settlements of a Shield Tunnel

2012 ◽  
Vol 568 ◽  
pp. 129-133
Author(s):  
Qian Yang ◽  
Jun Xing Zhang ◽  
Geng Ning Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Soft Soil ◽  
Shield Tunnel ◽  
Soft Layer ◽  
Element Analysis ◽  
3D Finite Element ◽  
Longitudinal Length ◽  
Coulomb Model

In this paper, we perform a 3D finite element analysis for the longitudinal settlement of a shield tunnel in soft soil, where a substratum soil contains a soft layer. The Mohr-Coulomb model is used for the substratum soil and soft layer. The longitudinal settlements are calculated for different elastic modulus and longitudinal length of the soft layer. The results show that a softer and longer layer will result in the larger settlement. It is also found that the maximum of the longitudinal settlements is linear function of the elastic modulus of the soft layer.

scholarly journals Realistic computer modelling of stent retriever thrombectomy: a hybrid finite-element analysis-smoothed particle hydrodynamics model

2021 ◽  
Vol 18 (185) ◽  
Author(s):  
S. Mostafa Mousavi J. S. ◽  
Danial Faghihi ◽  
Kelsey Sommer ◽  
Mohammad M. S. Bhurwani ◽  
Tatsat R. Patel ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Smoothed Particle Hydrodynamics ◽  
Computer Modelling ◽  
Blood Clot ◽  
Stent Retriever ◽  
Element Analysis ◽  
Hybrid Finite Element ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Stent retriever thrombectomy is a pre-eminent treatment modality for large vessel ischaemic stroke. Simulation of thrombectomy could help understand stent and clot mechanics in failed cases and provide a digital testbed for the development of new, safer devices. Here, we present a novel, in silico thrombectomy method using a hybrid finite-element analysis (FEA) and smoothed particle hydrodynamics (SPH). Inspired by its biological structure and components, the blood clot was modelled with the hybrid FEA–SPH method. The Solitaire self-expanding stent was parametrically reconstructed from micro-CT imaging and was modelled as three-dimensional finite beam elements. Our simulation encompassed all steps of mechanical thrombectomy, including stent packaging, delivery and self-expansion into the clot, and clot extraction. To test the feasibility of our method, we simulated clot extraction in simple straight vessels. This was compared against in vitro thrombectomies using the same stent, vessel geometry, and clot size and composition. Comparisons with benchtop tests indicated that our model was able to accurately simulate clot deflection and penetration of stent wires into the clot, the relative movement of the clot and stent during extraction, and clot fragmentation/embolus formation. In this study, we demonstrated that coupling FEA and SPH techniques could realistically model stent retriever thrombectomy.

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