Prediction of the ice resistance of icebreakers using explicit finite element analyses with a real-time load control technique

2021 ◽  
pp. 109825
Author(s):  
Donghwa Han ◽  
Kwang-Jun Paik ◽  
Seong-Yeop Jeong ◽  
Joonmo Choung
Keyword(s):  
Finite Element ◽  
Real Time ◽  
Control Technique ◽  
Load Control ◽  
Finite Element Analyses ◽  
Explicit Finite Element ◽  
Ice Resistance

Selective mass scaling for explicit finite element analyses

2005 ◽  
Vol 63 (10) ◽  
pp. 1436-1445 ◽  
Author(s):  
Lars Olovsson ◽  
Kjell Simonsson ◽  
Mattias Unosson
Keyword(s):  
Finite Element ◽  
Finite Element Analyses ◽  
Explicit Finite Element ◽  
Mass Scaling

A Finite Element Analysis of Collapse of Perforated Casing

1983 ◽  
Vol 105 (3) ◽  
pp. 234-240 ◽  
Author(s):  
M. B. Smith ◽  
P. D. Pattillo
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Strength Reduction ◽  
Control Technique ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Cross Sectional ◽  
Loading Pattern ◽  
Nonuniform Loading ◽  
Definition Of

The purpose of this paper is to report the results of finite element analyses of the collapse of perforated casing. In the study, both inline (0-deg phasing) and staggered (90-deg phasing) patterns are considered. The primary intent of the study is to illustrate the severe loss of casing cross-sectional integrity accompanying extrusion of a ductile formation into the wellbore. It is shown that, for reasonable perforation densities, the primary effect of the perforation pattern is not strength reduction of the cross section, but definition of a nonuniform loading pattern resulting from formation production. In this regard, in the presence of large-scale formation failure in the near wellbore region, it is crucial to the integrity of the casing that a solids control technique be employed.

LIMIT LOADS OF FRAMED STRUCTURES AND ARCHES USING THE GLOSS R-NODE METHOD

1993 ◽  
Vol 17 (2) ◽  
pp. 197-214
Author(s):  
C.P.D. Fernando ◽  
R. Seshadri
Keyword(s):  
Finite Element ◽  
Approximate Method ◽  
Equivalent Stress ◽  
Limit Load ◽  
Load Control ◽  
Finite Element Analyses ◽  
Limit Loads ◽  
Framed Structures ◽  
Linear Elastic ◽  
Reference Stress

An approximate method for determining limit loads of mechanical components and structures on the basis of two linear elastic finite element analyses is described. The load-control nature of the redistribution nodes (r-nodes) leads to considerable simplifications. The combined r-node equivalent stress, which can be obtained by invoking an appropriate multibar mode, can be identified with the reference stress. The method is applied to beam, framed and arched structures, and the limit load estimates obtained are reasonably accurate.

Survivability of Railroad Tank Car Top Fittings in Rollover Scenario Derailments

2010 ◽  
Author(s):  
Robert S. Trent ◽  
Anand Prabhakaran ◽  
Francisco Gonza´lez ◽  
Vinaya Sharma ◽  
Srinivas Chitti
Keyword(s):  
Finite Element ◽  
Impact Energy ◽  
Longitudinal Velocity ◽  
Nonlinear Material ◽  
Protective Structure ◽  
Finite Element Analyses ◽  
Explicit Finite Element ◽  
Damage And Failure ◽  
Concrete Barrier ◽  
Validation Testing

Railroad tank car top fittings are susceptible to damage and failure in rollover derailments, which might result in release of hazardous material lading to the environment. In this paper, we propose and analyze five protective structure concepts designed to eliminate or reduce damage to these top fittings in a rollover derailment, using explicit finite element analyses incorporating nonlinear material and geometry models. Three different rollover scenarios are studied; a nominal rollover, a more severe rollover with greater impact energy, and a rollover combined with longitudinal velocity, with the tank car impacting a concrete barrier. The results from these analyses as well as plans for validation testing are presented in the paper.

Prediction of Tread Pattern Wear by an Explicit Finite Element Model3

2007 ◽  
Vol 35 (4) ◽  
pp. 276-299 ◽  
Author(s):  
J. C. Cho ◽  
B. C. Jung
Keyword(s):  
Finite Element ◽  
Wear Rate ◽  
Tangential Stress ◽  
Rate Equation ◽  
Constitutive Equations ◽  
Slip Velocity ◽  
Test Results ◽  
Explicit Finite Element ◽  
Driving Condition ◽  
Driving Conditions

Abstract Tread pattern wear is predicted by using an explicit finite element model (FEM) and compared with the indoor drum test results under a set of actual driving conditions. One pattern is used to determine the wear rate equation, which is composed of slip velocity and tangential stress under a single driving condition. Two other patterns with the same size (225/45ZR17) and profile are used to be simulated and compared with the indoor wear test results under the actual driving conditions. As a study on the rubber wear rate equation, trial wear rates are assumed by several constitutive equations and each trial wear rate is integrated along time to yield the total accumulated wear under a selected single cornering condition. The trial constitutive equations are defined by independently varying each exponent of slip velocity and tangential stress. The integrated results are compared with the indoor test results, and the best matching constitutive equation for wear is selected for the following wear simulation of two other patterns under actual driving conditions. Tens of thousands of driving conditions of a tire are categorized into a small number of simplified conditions by a suggested simplification procedure which considers the driving condition frequency and weighting function. Both of these simplified conditions and the original actual conditions are tested on the indoor drum test machines. The two results can be regarded to be in good agreement if the deviation that exists in the data is mainly due to the difference in the test velocity. Therefore, the simplification procedure is justified. By applying the selected wear rate equation and the simplified driving conditions to the explicit FEM simulation, the simulated wear results for the two patterns show good match with the actual indoor wear results.

Tire Cornering Simulation Using an Explicit Finite Element Analysis Code

1998 ◽  
Vol 26 (2) ◽  
pp. 109-119 ◽  
Author(s):  
M. Koishi ◽  
K. Kabe ◽  
M. Shiratori
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Test System ◽  
Experimental Results ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
Element Method

Abstract The finite element method has been used widely in tire engineering. Most tire simulations using the finite element method are static analyses, because tires are very complex nonlinear structures. Recently, transient phenomena have been studied with explicit finite element analysis codes. In this paper, the authors demonstrate the feasibility of tire cornering simulation using an explicit finite element code, PAM-SHOCK. First, we propose the cornering simulation using the explicit finite element analysis code. To demonstrate the efficiency of the proposed simulation, computed cornering forces for a 175SR14 tire are compared with experimental results from an MTS Flat-Trac Tire Test System. The computed cornering forces agree well with experimental results. After that, parametric studies are conducted by using the proposed simulation.

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