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제안 방법
- The other is numerical material modelling by LS-DYNA to consider ice-structure interaction. For the evaluation of structural safety, the sensitivity analysis against the ice contact pressure was performed. In addition to the structural response, the ice contact load was investigated in detail such as the effect of the structural interaction and the influence of eccentric collision.
- Gagnon (2011) calibrated volumetric strain-stress relationship based on MAT63 CRUSHABLE_FORM through the bergy bit field trial data. He carried out FEM simulation of the compression of the pyramid-shaped ice. He modelled several thin ice layers to express spalling behavior.
- , 2014) developed in National Maritime Research Institute, Japan. In this study, the authors carried out a series of non-linear dynamic finite element simulations to evaluate the structural safety and estimate the ice contact load, including the effect of ice-structure interaction. For the ice contact load, two modelling approaches are adopted.
- The purpose of the present study is to investigate the tendency of ice contact load and the structural response of the stern duct equipped for ice-class vessels. The main contact scenario is based on Finnish-Swedish Ice Class Rules (TRAFI, 2010), and the used stern duct structure is Weather Adapted Duct (Kawashima et al.
- Meanwhile, in case of the protuberant structure such as a stern duct, oscillation occurs significantly by an impact force and the structural response may affect the impact load. To investigate such influence, the simulation were performed with a stern duct of rigid body as well as elastoplastic (flexible) body, and both contact loads were compared. The used FEM model is shown in Fig.
대상 데이터
- To clarify the reduction of the contact load against the eccentricity, the eccentric contact analysis was performed by LS-DYNA. The material property of ice is assumed to be MAT63 (high), and the structure is assumed to be a rigid body. The six cases in different eccentricities, 0, 0.
이론/모형
- These material properties are defined in LS-DYNA using a MAT41_USE_DEFINED_MATERIAL_MODELS which is defined by user subroutine. As a return mapping method for the yield surface, the cutting-plane algorithm (E. A. de Souza Neto et.al., 2008) was used. The effect of strain rate and work hardening were not considered.
- 13 m were carried out. For the numerical simulation, LS-DYNA was chosen. The FEM models of the ice block and the cylinder are indicated in Fig.
- 8. The junction between solid and shell element is modelled by Shell-Solid coupling model (Osawa et al., 2007).
- Thus the initial kinematic energy is absorbed partly into the rotational energy of the ice block by eccentric collision and the contact load should be somewhat reduced. To clarify the reduction of the contact load against the eccentricity, the eccentric contact analysis was performed by LS-DYNA. The material property of ice is assumed to be MAT63 (high), and the structure is assumed to be a rigid body.
- (2). To solve the differential equation, Runge-Kutta method was used. The initial condition was set to ξn = 0, ξn( = v0)= 5 kt.
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