Implementation of Finite-Element Codes for the Simulation of Ship-Ship Collisions*

2002 ◽  
Vol 46 (04) ◽  
pp. 239-247
Author(s):  
Dimitris Servis ◽  
Manolis Samuelides ◽  
Tina Louka ◽  
Giorgos Voudouris
Keyword(s):  
Finite Element ◽  
Automotive Industry ◽  
Structural Elements ◽  
Finite Element Analyses ◽  
Engineering Research ◽  
Effective Implementation ◽  
The Past ◽  
Research Areas ◽  
Considerable Success ◽  
Impact Problems

The problem of ship collisions may well be considered one of the most complicated impact problems that contemporary engineering research is encountering. The structures involved are very large and include various structural elements. Thus, there is a large number of different modes of deformation that may occur, a fact that introduces a lot of parameters in the investigation of such problems. Finite-element analyses have been used over the past decade to solve several impact problems effectively. Though considerable success has been recorded in many research areas, such as the automotive industry, ship collision simulations still confront diffculties culties in providing reliable results. This paper attempts to determine the parameters that largely influence ship collisions and to provide tools and guidelines for the effective implementation of finite-element codes.

An Evaluation and Comparison of Models for Maximum Deflection of Stiffened Plates Using Finite Element Analysis

2007 ◽  
Vol 44 (04) ◽  
pp. 212-225
Author(s):  
Lior Banai ◽  
Omri Pedatzur
Keyword(s):  
Finite Element ◽  
Orthotropic Plate ◽  
Lateral Pressure ◽  
Stiffened Plates ◽  
Maximum Deflection ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Past ◽  
Different Types

Stiffened plates form the backbone of most of a ship's structure. Today, finite element (FE) models are used to analyze the behavior of such structural elements for different types of loads. In the past, when usage of computers and FE models were not used very much, analytical analysis methods were required. Two well-known methods have been developed for analyses of stiffened plates under lateral loading (uniform pressure), based on two different models, namely, the orthotropic plate model and the grillage model. Both models can give estimations for the maximum plate deflection under uniform lateral pressure. The objective of this paper is to present the two methods, evaluate and compare the methods using the finite element method, and finally implement the methods as a computer program for quick estimations of the maximum deflection of stiffened plates. The degree of accuracy of the two methods when compared to FE is discussed in some detail.

scholarly journals Clarifying a Circularity Phenomenon in a Circular Economy under the Notion of Potential

2021 ◽  
Vol 16 (1) ◽  
pp. 79-89
Author(s):  
Tetiana Shevchenko ◽  
◽  
Roman Vavrek ◽  
Yuriy Danko ◽  
Olena Gubanova ◽  
...  
Keyword(s):  
Circular Economy ◽  
Closed Loop ◽  
Global Scale ◽  
Structural Elements ◽  
Effective Implementation ◽  
The Past ◽  
Comprehensive Picture ◽  
Cradle To Cradle ◽  
Available Resources

Turning from linear to circular business model, from cradle-to-grave to cradle-to-cradle and from waste to wealth, the concept of circular economy (CE) has become an important tool to promote sustainable develop-ment as it combines economic, environmental and social benefits at a local as well as global scale. In the shift towards CE, examining the CE from the perspective of its potential is crucial for its wider and more effective implementation in the practice. The aim of the paper is to clarify a circularity phenomenon in closed-loop econ-omy under the notion of potential in part of (1) the structural elements, (2) underlying categories and (3) basal properties as a follow-up to the previous studies about managing the circularity potential. The study provides the theoretical framework for understanding circularity potential by developing the circularity potential categoriza-tion in order to get a comprehensive picture of what has been done in the past and where efforts are most need today to achieve a progress towards circularity in the future. The basal properties of circularity potential such as integrity, dynamism, territorial affiliation and different strategies compatibility were revealed and discussed for managing the circularity potential. The findings of the paper have ambition to contribute to new metrics devel-opment to measure the progress towards zero-waste and CE aimed at identification and monitoring all the possible forms of the circularity potential – opportunities, reserves, available resources, rather than the available resources only that were primarily considered in the past attempts at the operationalisation of circular economy.

Effect of Residual Forming Stresses on Fracture in ERW Pipe

2016 ◽  
Author(s):  
Ted L. Anderson ◽  
Gregory W. Brown
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Fracture Behavior ◽  
Finite Element Simulations ◽  
Finite Element Analyses ◽  
Forming Process ◽  
Cold Expansion ◽  
The Past

Many older pipelines contain significant residual stress due to the forming process. Cold expansion or a normalizing heat treatment can virtually eliminate residual forming stresses, but these practices were less common in the past. In the absence of cold expansion or normalization, residual forming stresses can be reduced by hydrostatic testing or operating pressures, but not eliminated entirely. Residual stresses can contribute to fracture in pipelines, particularly when the material toughness is low. This article presents a series of analyses that seek to quantify the magnitude of residual forming stresses as well as their impact on pipeline integrity. The pipe forming process was simulated with elastic-plastic finite element analyses, which considered the effect of subsequent loading on relaxation of residual stresses. A second set of finite element simulations were used to quantify the effect of residual stresses on fracture behavior.

scholarly journals Analysis Beam-Column Cellular By Finite Element Method

10.29007/s1rd ◽  
2022 ◽  
Author(s):  
Minh Duc Nguyen ◽  
Thai Hien Nguyen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Web Openings ◽  
Telephone Networks ◽  
The Past ◽  
Post Buckling ◽  
The Subject ◽  
Element Method

Nowadays in the construction of modem buildings, it is necessary to accommodate pipes and ducts necessary services, such as air conditioning, water supply, sewerage, electricity, computer networks, and telephone networks. Cellular members – steel I‐ shaped structural elements with circular web openings at regular intervals – have been used as beams for more than 35 years now. Although in the past already a large deal of research was performed into the subject of the behavior of cellular beams, almost no attention has been paid to the application of cellular members as columns. The column will be analyzed using the finite element method to calculate the critical load and compared with the Eurocode3 standard, web-post buckling, and frame using cellular member by FEM.

scholarly journals FEM-based stability charts for underground cavities in soft carbonate rocks: validation through case-study applications

2019 ◽  
Author(s):  
Michele Perrotti ◽  
Piernicola Lollino ◽  
Nunzio Luciano Fazio ◽  
Mario Parise
Keyword(s):  
Carbonate Rocks ◽  
Structural Elements ◽  
Finite Element Analyses ◽  
Challenging Problem ◽  
The Past ◽  
Geometrical Features ◽  
Underground Cavities ◽  
The Stability ◽  
Rock Mechanical Properties

Abstract. The stability of man-made underground cavities in soft rocks interacting with overlying structures and infrastructures represents a challenging problem to be faced. Based upon the results of a large number of parametric two-dimensional (2D) finite-element analyses of ideal cases of underground cavities, accounting for the variability of cave geometrical features and rock mechanical properties, specific charts have been recently proposed in the literature to assess at a preliminary stage the stability of the cavities. The purpose of the present paper is to validate the efficacy of the stability charts by means of the application to several case studies of underground cavities, either subjected to collapse in the past or still stable. The stability charts proposed result to be performing to catch the stability conditions and, eventually, the conditions that lead to failure occurrence. For sinkholes already occurred, they show the importance of structural elements as pillars and internal walls in the stability of the whole quarry system, whereas, for cavities that have not reached failure, they can provide useful indications about the eventual proneness of the underground cavity to local or general instability phenomena.

Strain Localization in the Dent of a Linepipe

2014 ◽  
Author(s):  
Jandark Oshana-Jajo ◽  
Hossein Ghaednia ◽  
Jamshid Zohreh Heydariha ◽  
Sreekanta Das
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Finite Element Analyses ◽  
Remedial Action ◽  
Line Pipe ◽  
Engineering Research ◽  
Element Simulation ◽  
Prime Objective ◽  
Full Scale Tests ◽  
Pipeline Wall

Steel pipelines used for transporting oil and gas can develop various damages such as mechanical damages, corrosion, wrinkle, and crack. One of the mechanical damages is a dent with or without other defects such as corrosion, gouge, and crack. The dent without other defect is often referred to as plain dent. Depending on the severity, a dent can lead to a failure of a field linepipe. The strain concentration in a dented pipeline wall can be used to determine the level of severity of a dent. Hence, a research program was undertaken at the Centre for Engineering Research in Pipelines (CERP) using full-scale tests and finite element analyses. The prime objective of this research was to determine comparative strain distributions in and around the dent and locations of high strains developed from the denting process. This information will help the pipeline operators to determine the severity of dents in their field linepipes. Hence, the outcome of this research will allow the pipeline operators to take an informed decision on whether or not an imminent remedial action for the dented segment of the line pipe is required. This paper presents test data and finite element simulation to discuss the locations and values of crucial strains in dents.

A Preliminary Study on the Mechanics of Ankle-Foot Orthoses: From 3D Laser Scan to Smooth Finite Element Model

2009 ◽  
Author(s):  
Tomas Praet ◽  
Matthieu De Beule ◽  
Sofie Van Cauter ◽  
Benedict Verhegghe
Keyword(s):  
Finite Element ◽  
Complex Geometry ◽  
Element Model ◽  
Foot Orthoses ◽  
Foot And Ankle ◽  
Finite Element Analyses ◽  
The Past ◽  
Ankle Foot Orthoses ◽  
Preliminary Study ◽  
Mechanical Devices

Ankle-foot orthoses or AFO’s are external mechanical devices that support the foot and ankle to assist and improve the gait of patients with muscular and/or neurological problems in the lower leg region. To improve the functionality of these orthoses quite some experimental research projects have been carried out and published in the past. However, only a handful of projects included basic finite element analyses (FEA) [1–3], mainly because of the diversity and complex geometry of the AFO’s. This preliminary study should give raise to a series of detailed finite element analyses based on 3D laser scans of ankle-foot orthoses.

Uneven Wear of Vehicle Tires

1993 ◽  
Vol 21 (4) ◽  
pp. 202-219 ◽  
Author(s):  
M. H. Walters
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Techniques ◽  
Lateral Stiffness ◽  
General Increase ◽  
Element Analysis ◽  
The Past ◽  
Uneven Wear

Abstract Advances in tire construction have led to major increases in tire life over the past twenty years, mainly by increasing the lateral stiffness and thus reducing slip during cornering. However, this general increase in tire life has tended to highlight the problem of uneven wear. In the present paper, three new experimental techniques are described which have been developed to study treadwear distributions. These techniques are evaluated and their results compared with a finite element analysis. Taken together, they indicate some of the causes of uneven wear and may be used to identify tire design and service features which contribute to uneven wear.

Temporal Focus

2020 ◽  
Author(s):  
Abbie J. Shipp
Keyword(s):  
Well Being ◽  
Psychology Research ◽  
The Past ◽  
Research Areas ◽  
The Future ◽  
Behavior Based ◽  
The Individual ◽  
And Behavior ◽  
Temporal Focus

Temporal focus is the individual tendency to characteristically think more or less about the past, present, and future. Although originally rooted in early work from psychology, research on temporal focus has been steadily growing in a number of research areas, particularly since Zimbardo and Boyd’s (1999) influential article on the topic. This chapter will review temporal focus research from the past to the present, including how temporal focus has been conceptualized and measured, and which correlates and outcomes have been tested in terms of well-being and behavior. Based on this review, an agenda for research is created to direct temporal focus research in the future.

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