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Peridynamic simulation of brittle-ice crushed by a vertical structure
Minghao Liu,Qing Wang,Wei Lu 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.2
Sea ice is the main factor affecting the safety of the Arctic engineering. However, traditional numerical methods derived from classical continuum mechanics have difficulties in resolving discontinuous problems like ice damage. In this paper, a non-local, meshfree numerical method called “peridynamics”, which is based on integral form, was applied to simulate the interaction between level ice and a cylindrical, vertical, rigid structure at different velocities. Ice in the simulation was freshwater ice and simplified as elastic-brittle material with a linear elastic constitutive model and critical equivalent strain criterion for material failure in state-based peridynamics. The ice forces obtained from peridynamic simulation are in the same order as experimental data. Numerical visualization shows advantages of applying peridynamics on ice damage. To study the repetitive nature of ice force, damage zone lengths of crushing failure were computed and conclude that damage zone lengths are 0.15e0.2 times as ice thickness.
Peridynamic simulation of brittle-ice crushed by a vertical structure
Liu, Minghao,Wang, Qing,Lu, Wei The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.2
Sea ice is the main factor affecting the safety of the Arctic engineering. However, traditional numerical methods derived from classical continuum mechanics have difficulties in resolving discontinuous problems like ice damage. In this paper, a non-local, meshfree numerical method called "peridynamics", which is based on integral form, was applied to simulate the interaction between level ice and a cylindrical, vertical, rigid structure at different velocities. Ice in the simulation was freshwater ice and simplified as elastic-brittle material with a linear elastic constitutive model and critical equivalent strain criterion for material failure in state-based peridynamics. The ice forces obtained from peridynamic simulation are in the same order as experimental data. Numerical visualization shows advantages of applying peridynamics on ice damage. To study the repetitive nature of ice force, damage zone lengths of crushing failure were computed and conclude that damage zone lengths are 0.15-0.2 times as ice thickness.
Long-Lu,류성기,Guangguang Feng,Minghao Ren,Huixia Zhang 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The compound technology of ion nitriding and multi-arc ion plating is adopted to make Ti1-xAlxN film on 40 Cr. The influence of Al content to the structure and functions of film is analyzed through SEM (Scanning Electron Telescope), XRD analyzer,micro hardness tester and scratch tester. It indicated that the Al content has obvious influence on the structure and function of film. The more Al content, the more droplets in the film. Phase structure tends to multiphase composite structures. The micro hardness and bonding force will be increased first, and then decreased with the rising Al content.
Analytical Prediction for Tunnel-Soil-Pile Interaction Mechanics based on Kerr Foundation Model
Zhiguo Zhang,Chengping Zhang,Kangming Jiang,Zhiwei Wang,Yunjuan Jiang,Qihua Zhao,Minghao Lu 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
Existing analytical method to predict tunneling-induced pile deformation is generally based on the Winkler foundation model that neglects shear effects of soil, which is not sufficient for engineering practice. A simplified solution based on Kerr foundation model is presented in this study to investigate the tunnel-soil-pile interaction. In order to improve the accuracy of the prediction for tunneling-induced free-field movements, the cavity contraction theory is utilized in the first stage which received a higher accuracy than the previous solution. In the second stage, the soil free-field displacement is imposed on the existing pile, and the simplified solution for pile deformation governed by the disturbance of passive displacement is established based on the Kerr foundation model, which can take account of the soil shear effects. The applicability and accuracy of the simplified solution are then verified by several cases including the reported analytical solution, centrifuge modeling tests and observed data in situ. Good agreements are obtained in the comparative analyses, which demonstrates that the proposed solution can serve as an alternative approach for conservatively estimating tunneling-induced pile deformation in the preliminary design in clay. Furthermore, the parametric analysis associated with the pile deformation has also been performed. As a result, it is of primarily theoretical and practical significance to investigate the influence of soil shear effects on the tunnel-soil-pile interaction mechanics.