scholarly journals Local structural analysis for container ships

2021 ◽  
Vol 44 ◽  
pp. 59-65
Author(s):  
Adrian Presura ◽  
Victor Mihai
Keyword(s):  
High Strength Steels ◽  
Fem Analysis ◽  
High Strength ◽  
Point Of View ◽  
Structural Elements ◽  
Inland Navigation ◽  
Local Structures ◽  
Stress Point ◽  
Different Types

Container ships presents highly stressed local structures under the corners of containers stack, which need rigorous analysis from rigidity and stress point of view. High value concentrated forces require the use of high strength steels or thick structural elements, for their analysis was used in this article FEM analysis with volume elements. An inland navigation barge was used as a case study and 40 ft containers were considered in order to analyze the situation with the greatest forces at the feet of containers. The investigated solutions for containers foundation are applicable for new ships and also for modernization of existing vessels. Technological and strength aspects were compared for different types of solution, that have to comply with specific Rules and need to satisfy production constrains of the Shipyards.

An Enhanced Hybrid Springback Compensation Approach: Springback Path – Displacement Adjustment Method For Complex Shaped Products of Sheet Metal Forming

2021 ◽  
Author(s):  
Zhihui Gong ◽  
Mandeep Singh ◽  
Bohao Fang ◽  
Dongbin Wei
Keyword(s):  
Sheet Metal ◽  
Automobile Industry ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Strength Steels ◽  
Fem Analysis ◽  
High Strength ◽  
Design Stage ◽  
Springback Compensation ◽  
Compensation Approach

Abstract Springback compensation is critical in sheet metal forming. Advanced techniques have been adopted in the design stage of various sheet metal forming processes, e.g. stamping, some of which are for complex shaped products. However, the currently available numerical approaches are not always sufficiently accurate and reliable. To improve the accuracy of springback compensation, an enhanced hybrid springback compensation method named Springback Path – Displacement Adjustment (SP-DA) method has been developed in this study based on the well-known conventional displacement adjustment (DA) method. Its effectiveness is demonstrated using FEM analysis of low, medium and high strength steels adopted in automobile industry, in which a symmetrical model owning geometry complexity similar to an auto body panel was established. The results show this new enhanced SP-DA method is able to significantly improve the accuracy of springback compensation comparing to conventional displacement adjustment technique.

The combination of different open innovations: a longitudinal case study

2019 ◽  
Vol 13 (2) ◽  
pp. 342-362
Author(s):  
Xiaodong Yuan ◽  
Xiaotao Li
Keyword(s):  
New Product Development ◽  
Open Innovation ◽  
Point Of View ◽  
Longitudinal Case Study ◽  
Key Factors ◽  
Content Type ◽  
Strategic Direction ◽  
Different Types ◽  
Innovation Capacity

Purpose The purpose of this paper is to explore how an organization can combine different types of open innovations and what are the key factors that may influence the combination of different open innovations. Design/methodology/approach The basic methodology of this paper is the longitudinal inductive analysis within the conceptual framework of the open innovation proposed by Dahlander and Gann (2010). In this case study of Xiaomi Tech Inc., the open innovation combination is investigated through examining 25 new products created between August 2010 and December 2016 in terms of four general types: acquiring, sourcing, selling and revealing open innovation. Findings In practice, the combination of different types of open innovations can be realized. A firm may combine different open innovations at three levels: a single product level, a related product cluster level and a company level. In addition, different open innovations can be combined in diverse modes. The purpose of combining different types of open innovations is to overcome the disadvantages of each type and to exploit the advantages of all different types. Many factors may affect a firm’s option of how to combine open innovations. At different development stages, a firm may make and implement corresponding strategic direction based on its innovation capacity and internal resource. For a given strategy, the firm needs to create profits and manage intellectual property in the implementation of open innovations. These factors are interacted each other, rather than isolated. Originality/value The findings of this paper are helpful for better understanding how and why an organization can combine different types of open innovations. From a managerial point of view, an organization may combine different types of open innovations to leverage advantages and avoid disadvantages of each certain type of open innovation. An appropriate combination of different open innovations can effectively improve new product development.

Study of the Prospects of the Use of High-Strength Steel Shapes

2013 ◽  
Vol 475-476 ◽  
pp. 1253-1256
Author(s):  
Valentina Parlashkevich ◽  
Oleg Tsyba
Keyword(s):  
Comparative Analysis ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Structural Elements ◽  
Steel Shapes ◽  
Economic Indices

The prospects of the use of rolled shapes made of high-strength steels in steel structural elements are considered. A comparative analysis of strength values and economic indices of steel structural elements is done for their work in compression, tension and bending.

Reliability of Burst Limit States for Damaged and Corroded High Strength Pipelines

2006 ◽  
Author(s):  
Marc A. Maes ◽  
Mamdouh M. Salama ◽  
Markus Dann
Keyword(s):  
Limit State ◽  
High Strength Steels ◽  
High Strength ◽  
Crack Arrest ◽  
Limit States ◽  
Lower Strain ◽  
Margin Of Safety ◽  
Normal Strength ◽  
The Impact

High strength steels (X100 and X120) that are being considered for high pressure gas pipelines differ from conventional steels by exhibiting lower work hardening capacity, lower strain to failure and softening of their HAZ. These differences impact burst limit state and tensile limit state, in addition to crack arrest. In this paper, the impact of the variations in mechanical properties on the reliability of pipe limit states involving ductile burst of damaged or corroded pipe is examined. The paper presents the results of burst limit state analysis using state-of-the-art plastic burst models of strain hardening pipe and considering all the uncertainties that impact the margin of safety of pipes subject to internal pressure. Intact pipes, corroded pipes and externally damaged pipes are considered. A case study comparing the differences between normal strength (X60) pipeline and high strength (X100) pipeline is also presented.

Fabrication of Glass-Metal Composite Micro/Nanonozzles

2008 ◽  
Author(s):  
Nisarga N. Naik ◽  
Mark G. Allen
Keyword(s):  
High Pressure ◽  
High Strength ◽  
Point Of View ◽  
Smooth Transition ◽  
Temperature Control System ◽  
Working Fluid ◽  
Metal Composite ◽  
Fabrication Technique ◽  
Stress Point ◽  
Glass Metal

This paper reports a fabrication technique for high strength glass-metal composite micro/nanonozzles with orifice diameters ranging from 430 nm to >100 μm. Unlike the conventional methods used to build micro/nanonozzles, the fabrication technique discussed in this paper is a non-lithographic approach. It uses conventional pulled borosilicate micropipettes as a foundation and nickel as a strengthening layer to build high pressure withstanding micro/nanonozzles. Pipettes built using the pulling process offer a smooth transition to the fluid from the reservoir to the tapered part of the nozzle, providing an ideal geometry from fluid flow and stress point of view. The nozzles are tested for high pressure withstanding capacity by integrating them with a high pressure fluidic setup to drive microjets. As an example, a 1.5 μm diameter nozzle, tested with propane as the working fluid to drive a microjet is observed to withstand pressures upto 10.5 MPa. Apart from simplicity of the fabrication process, this approach also offers the ability to incorporate a wireless temperature control system for the nozzles.

Development of High Strength Material and Pipe Production Technology for Grade X120 Line Pipe

2004 ◽  
Author(s):  
Hans-Georg Hillenbrand ◽  
Andreas Liessem ◽  
Karin Biermann ◽  
Carl Justus Heckmann ◽  
Volker Schwinn
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Point Of View ◽  
Accelerated Cooling ◽  
Pipe Production ◽  
Production Test ◽  
Low Carbon ◽  
Long Distance ◽  
Line Pipe ◽  
Economic Point

The increasing demand for natural gas will further influence the type of its transportation in the future, both from the strategic and economic point of view. Long-distance pipelines are a safe and economic means to transport the gas from production sites to end users. High-strength steels in grade X80 are nowadays state of the art. Grade X100 was recently developed but not yet utilised. The present-day technical limitations on the production of X120 line pipe namely the steel composition, the pipe forming and the welding are addressed in this paper. Production test results on X120 pipes are presented to describe the materials properties. A low carbon and low PCM steel with VNbTiB microalloying concept is used. In the plate rolling the main attention is turned to the heavy accelerated cooling. The large spring back that occurs during the U-forming step of the UOE process is one of the most complex aspects in forming X120. To handle this aspect FEM calculations were used to modify the forming parameters and to optimise the shape of the U-press tool. For optimising the existing welding procedure with respect to an avoidance of HAZ softening, a low heat input welding technology and new welding consumables were developed.

Optimisation of Die Radius Geometry in Sheet Metal Stamping

2011 ◽  
Vol 337 ◽  
pp. 350-353 ◽  
Author(s):  
Xuan Zhi Wang ◽  
S.H. Masood
Keyword(s):  
Tool Wear ◽  
Sheet Metal ◽  
High Strength Steels ◽  
High Strength ◽  
Sheet Metal Stamping ◽  
Advanced High Strength Steels ◽  
Metal Stamping ◽  
Contact Pressures ◽  
Abaqus Software

Advanced high strength steels (AHSS) are increasingly utilised in sheet metal stamping in the automotive manufacture. In comparison with conventional steels, AHSS stampings produce higher contact pressures at the interface between the tool-workpiece interface, leading to more severe wear conditions, particularly at the draw die radius. To minimise tool wear using this approach it would be necessary to optimise the shape for a particular combination of circular and high elliptical profiles. This paper presents a methodology to optimise a die radius profile. For this, a specialised software routine is developed and compiled for optimisation of die radius profiles to minimise or achieve uniform contact pressure (wear distribution) using Python computer programming language supported by Abaqus software. A detailed algorithm for the optimisation is explained. A case study based on the algorithm is also discussed.

scholarly journals Development of Advanced High Strength Automotive Steels

2021 ◽  
Vol 4 (1) ◽  
pp. 9-17
Author(s):  
Miklós Tisza
Keyword(s):  
Automotive Industry ◽  
First Generation ◽  
Driving Forces ◽  
Raw Materials ◽  
High Strength Steels ◽  
High Strength ◽  
Point Of View ◽  
Raw Material ◽  
Advanced High Strength Steels ◽  
Harmful Emissions

Abstract In recent decades, the automotive industry has faced ever-increasing demands. Increasing requirements can be observed in terms of both consumer expectations and legal requirements. On the consumer side, there is a demand for cars that are as economical as possible with lower fuel consumption, but providing also greater comfort and safety. These requirements are accompanied, from a legal point of view by more rigorous environmental regulations and requirements concerning the reduction of harmful emissions. Meeting these often-contradictory requirements is a growing challenge for car manufacturers and raw material suppliers, as well. Meeting the requirements in the most versatile way has resulted in tremendous progress over the last 40–50 years, both in the automotive industry and in the production and development of raw materials. The first part of this series of papers summarizes the main requirements in the automotive industry, as the main driving forces for material developments. Furthermore, the main types and properties of traditional high-strength steels, as well as the so-called first-generation Advanced High-Strength Steels will be introduced. In the second part, the main types and manufacturing processes of second generation advanced high-strength steels will be analyzed and some of the current steel developments will be presented through the results of the three generations of Advanced High-Strength Steels.

Open-book management in libraries: A case study of Bibliotheca Alexandrina

IFLA Journal ◽  
2018 ◽  
Vol 44 (4) ◽  
pp. 323-339
Author(s):  
Nehal Fouad Ismael
Keyword(s):  
Point Of View ◽  
Open Book ◽  
Different Types ◽  
Great Culture

The study aims at defining the requirements of applying open-book management and showing the stages and steps to apply this new management methodology in different types of libraries. The researcher selected Bibliotheca Alexandrina as a great culture minaret to measure the degree of practicing open-book management from the point of view of its employees in order to identify the constraints that limit the full application of open-book management in the library.

scholarly journals Fuzzy Automata as Coalgebras

Mathematics ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 272
Author(s):  
Ai Liu ◽  
Shun Wang ◽  
Luis Soares Barbosa ◽  
Meng Sun
Keyword(s):  
Process Algebra ◽  
Handwriting Recognition ◽  
Point Of View ◽  
Air Conditioners ◽  
Object Oriented Design ◽  
Fuzzy Language ◽  
Different Types ◽  
Component Based Software Engineering ◽  
Fuzzy Automata

The coalgebraic method is of great significance to research in process algebra, modal logic, object-oriented design and component-based software engineering. In recent years, fuzzy control has been widely used in many fields, such as handwriting recognition and the control of robots or air conditioners. It is then an interesting topic to analyze the behavior of fuzzy automata from a coalgebraic point of view. This paper models different types of fuzzy automata as coalgebras with a monad structure capturing fuzzy behavior. Based on the coalgebraic models, we can define a notion of fuzzy language and consider several versions of bisimulation for fuzzy automata. A group of combinators is defined to compose fuzzy automata of two branches: state transition and output function. A case study illustrates the coalgebraic models proposed and their composition.

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