A simulation study on the interaction between sloping marine structure and level ice based on cohesive element model

2018 ◽  
Vol 149 ◽  
pp. 1-15 ◽  
Author(s):  
Feng Wang ◽  
Zao-Jian Zou ◽  
Li Zhou ◽  
Yi-Zhou Ren ◽  
Shu-Qi Wang
Keyword(s):  
Simulation Study ◽  
Element Model ◽  
Cohesive Element ◽  
Marine Structure ◽  
Level Ice ◽  
Cohesive Element Model

Parameter Sensitivity in Numerical Modelling of Ice-Structure Interaction With Cohesive Element Method

2016 ◽  
Author(s):  
Dianshi Feng ◽  
Sze Dai Pang ◽  
Jin Zhang
Keyword(s):  
Element Model ◽  
Offshore Structures ◽  
Parameter Sensitivity ◽  
The Arctic ◽  
Cohesive Element ◽  
Structure Interaction ◽  
Marine Structure ◽  
Ice Loads ◽  
The Stability ◽  
Element Method

The increasing marine activities in the Arctic has resulted in a growing demand for reliable structural designs in this region. Ice loads are a major concern to the designer of a marine structure in the arctic, and are often the principal factor that governs the structural design [Palmer and Croasdale, 2013]. With the rapid advancement in computational power, numerical method is becoming a useful tool for design of offshore structures subjected to ice actions. Cohesive element method (CEM), a method which has been widely utilized to simulate fracture in various materials ranging from metals to ceramics and composites as well as bi-material systems, has been recently applied to predict ice-structure interactions. Although it shows promising future for further applications, there are also some challenging issues like high mesh dependency, large variation in cohesive properties etc., yet to be resolved. In this study, a 3D finite element model with the use of CEM was developed in LS-DYNA for simulating ice-structure interaction. The stability of the model was investigated and a parameter sensitivity analysis was carried out for a better understanding of how each material parameter affects the simulation results.

A diffusion-coupled cohesive element model for cracking analysis of thermal barrier coatings

2021 ◽  
Vol 246 ◽  
pp. 107625
Author(s):  
Jianan Song ◽  
Hongyu Qi ◽  
Shaolin Li ◽  
Xiaoguang Yang ◽  
Duoqi Shi ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Element Model ◽  
Thermal Barrier ◽  
Cohesive Element ◽  
Barrier Coatings ◽  
Cohesive Element Model

Computational Methods for Solving Dynamic Ice Structure Interaction Problems

2011 ◽  
Author(s):  
Ibrahim Konuk
Keyword(s):  
Dynamical System ◽  
Boundary Value Problem ◽  
Initial Boundary ◽  
Initial Boundary Value Problem ◽  
Element Model ◽  
Cohesive Element ◽  
Structure Interaction ◽  
Initial Boundary Value ◽  
Well Posed ◽  
Cohesive Element Model

A framework based on a complex dynamical system viewpoint for formulating and solving dynamic ice-structure interaction problems is introduced. Important constituents required for formulating a well posed initial-boundary value problem are discussed. Significance of these constituents is illustrated using a Cohesive Element model of several example problems.

Optimization of Wire Loop Height for a Cavity Down Plastic Pin Grid Array Package

1998 ◽  
Vol 120 (2) ◽  
pp. 194-200 ◽  
Author(s):  
I. Chaudhry ◽  
F. Barez
Keyword(s):  
Finite Element ◽  
Simulation Study ◽  
Thermal Stresses ◽  
Element Model ◽  
Temperature Cycling ◽  
Effect Of Temperature ◽  
Temperature Cycle ◽  
Wire Loop ◽  
Simulation Results ◽  
Test Points

A study has been conducted to resolve wire neck break problem in a cavity-down plastic pin grid array (PPGA) packages with a specific range of parameters when subjected to temperature cycle (−55°C/+125°C). In most cases, a weak or broken neck of the wire was observed after 300 cycles of temperature cycling. The objective of this study is to determine an optimum wire loop height so that the package can pass a 1000 temperature cycles. Results of a simulation study, performed by other researchers, using a finite element model (FEM) were utilized. Their work considered the effect of temperature cycling on PPGA packages identical to those in this report. Several possible factors that can contribute to this failure mechanism were analyzed, and stresses in the wires were evaluated. The simulation results were verified by running an experiment on actual parts. The parts were subjected to temperature cycling, and data was gathered at different test points. The experimental results obtained did concur with simulation results which suggested that the area just above the ball experienced a significant level of thermal stresses, and such stresses could be reduced by determining an optimum loop height.

Numerical Simulation of Ice Action to a Lighthouse

2009 ◽  
Author(s):  
Arne Gu¨rtner ◽  
Morten Bjerka˚s ◽  
Walter Ku¨hnlein ◽  
Peter Jochmann ◽  
Ibrahim Konuk
Keyword(s):  
Outer Boundary ◽  
Element Model ◽  
Computational Method ◽  
Ice Thickness ◽  
Cohesive Elements ◽  
Element Mesh ◽  
To The Lighthouse ◽  
Ice Loads ◽  
Qualitative Observation ◽  
Cohesive Element Model

Ice actions to the Norstro¨msgrund lighthouse are simulated by means of the computational cohesive element model. The numerical model is developed in the framework of finite elements. Fracture of the ice sheet is accounted for by the cohesive elements placed at internal finite element mesh boundaries in order to track traction versus separation. One single ice event on the Norstro¨msgrund lighthouse is selected for which the ice loads as well as outer boundary conditions are recorded. This event serves as a basis for comparison to the computational method presented in this paper. The simulation results indicate that the proposed numerical method captures many of the qualitative observation as well as quantitatively derives comparable global ice loads to the lighthouse to those of the selected ice event. Future analysis should include additional validation to variations in ice thickness and drift speed.

Simulation of Fracture Behavior in the Microstructure of Ceramic Tool Materials

2012 ◽  
Vol 457-458 ◽  
pp. 89-92
Author(s):  
Ting Ting Zhou ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Jun Wang ◽  
Bin Zou ◽  
...  
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
Single Phase ◽  
Voronoi Tessellation ◽  
Element Model ◽  
Cohesive Element ◽  
Ceramic Tool ◽  
Tool Materials

In the paper, the Voronoi tessellation model is used to represent the microstructure of ceramic tool materials. And a finite element model based on cohesive element method has been developed to investigate the fracture behavior of the microstructure. The influences of mesh densities and cohesive parameters on the cracking patterns have been discussed. It is found that the enhancement of the grain boundary strength is beneficial for raising the fracture resistance of single-phase ceramic tool materials.

Sign in / Sign up

Export Citation Format

Share Document