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|Title:||Particle methods for modelling impact load on structures|
|Authors:||Koh, C.G. |
|Source:||Koh, C.G.,Swaddiwudhipong, S.,Liu, Z.S.,Gao, M. (2011). Particle methods for modelling impact load on structures. Proceedings of the 9th International Conference on Shock and Impact Loads on Structures : 41-56. ScholarBank@NUS Repository.|
|Abstract:||Lightweight structures in the form of plates and shells are often used in many civil, offshore, marine, automobile and aerospace structures. Impact load on these structures can have devastating effect if not properly designed. In this keynote paper, particle methods are used in studying two problems of impact load on structures: (a) collision of solid object and (b) impact pressure due to water sloshing. In the first problem, the Smooth Particle Hydrodynamics (SPH) method is adopted to obtain the nonlinear dynamic response of plates and shells due to high velocity contact-impact. The SPH equations, which govern the elastic and elasto-plastic large deformation dynamic response of lightweight structure, are derived. The proposed additional stress points are introduced to mitigate the tensile instability inherent in the SPH method. Examples on stress wave propagation in 1-D and 2-D structures are presented. The SPH results are in good agreement with available analytical values and finite element solutions. In the second problem, a new particle method called the Consistent Particle Method is adopted to obtain impact load due to water sloshing. The method solves the Navier-Stokes equations in a semi-implicit time stepping scheme. Unlike SPH that uses kernel function, partial differential operators are approximated in a way consistent with Taylor series expansion. The incompressibility condition of free surface particles is enforced by an adjustment scheme. The method is demonstrated through 2D dam break and water sloshing in tank. The numerical solutions of impact pressure compare well with published experimental results and our experimental shake-table results.|
|Source Title:||Proceedings of the 9th International Conference on Shock and Impact Loads on Structures|
|Appears in Collections:||Staff Publications|
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