Development of particle-based simulation method for viscoelastic materials towards elucidation of subsidence mechanisms of ballasted track

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18140
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering project/Traffic engineering
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: NISHIURA Daisuke 国立研究開発法人海洋研究開発機構, 数理科学・先端技術研究分野, 技術研究員 (60509719)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: バラスト軌道 / 離散要素法 / シミュレーション / 並列計算 / 粘弾性 / 軌道沈下 / 有限要素法 / DEM

Outline of Final Research Achievements

Simulation of a large number of deformable bodies is often difficult because complex high-level modeling is required to address both multi-body contact and viscoelastic deformation. In this study, a quadruple discrete element method (QDEM) was developed for dynamic analysis of viscoelastic materials using a simpler algorithm compared to the standard finite element method (FEM). First, the fundamental performance of QDEM was investigated for viscoelastic analysis. The amplitude and frequency of cantilever elastic vibration were nearly equal to those obtained by the standard FEM. Therefore, the high accuracy of QDEM in the fundamental analysis of infinitesimal viscoelastic deformations was verified.
Finally, the sleeper and ballast motion modeled using QDEM was coupled with the rail motion modeled using FEM. The traffic impact response of a ballast particle and a sleeper was analyzed. The three-dimensional spatial distribution of ballast particle displacement was clearly revealed.

Free Research Field

計算工学