Strength assessment of an intact and damaged container ship subjected to asymmetrical bending loadings

2018 ◽  
Vol 58 ◽  
pp. 172-198 ◽  
Author(s):  
M. Tekgoz ◽  
Y. Garbatov ◽  
C. Guedes Soares
Keyword(s):  
Container Ship ◽  
Strength Assessment ◽  
Asymmetrical Bending

A Comparison of Direct Calculation Approaches Applied on the Fatigue Strength Assessment of a Panamax Container Ship

2012 ◽  
Author(s):  
Zhiyuan Li ◽  
Wengang Mao ◽  
Jonas W. Ringsberg
Keyword(s):  
Stress Response ◽  
Fatigue Strength ◽  
Fatigue Damage ◽  
Measurement Data ◽  
Direct Calculation ◽  
Container Ship ◽  
Calculation Methods ◽  
Strength Assessment ◽  
Strip Theory ◽  
Calculation Procedures

Today, it is common practice to carry out fatigue assessments of ship structures using direct calculation procedures. A direct calculation analysis of a ship’s fatigue strength involves hydrodynamic analysis, stress response evaluation followed by fatigue damage calculation. Many numerical codes are available for these types of analyses. They could yield different values in a fatigue life prediction because of the different degrees of complexity in the computation of the ship’s response. For example, hydrodynamic loads can be calculated using the strip theory or the panel method. The stress response to these loads can be computed using a beam theory or more advanced analyses, such as global and/or local finite element analyses. In a direct fatigue analysis for ship design, spectral methods have been dominating but there is a growing interest in time-domain fatigue damage calculation procedures. The objective of the current investigation is to compare four commonly used direct calculation methods against measurement data. The comparison is carried out by making a case study on a Panamax container ship on which full-scale measurements have been performed. The computational efforts involved in the application of the current direct calculation methods are compared and their applicability in ship fatigue design is discussed.

Fatigue Strength Assessment Analysis of Large Container Ship

2014 ◽  
Vol 602-605 ◽  
pp. 385-389 ◽  
Author(s):  
Feng Lei Han ◽  
Chun Hui Wang ◽  
An Kang Hu ◽  
Ya Chong Liu
Keyword(s):  
Fatigue Strength ◽  
Hot Spot ◽  
Direct Calculation ◽  
Linear Wave ◽  
Container Ship ◽  
Wave Loads ◽  
Wave Load ◽  
Strength Assessment ◽  
Fatigue Strength Assessment ◽  
Large Container

Fatigue assessments of container ship structures can be processed using various direct calculation approaches or various approaches of classification societies [1,2]. In this investigation, the fatigue strength assessment to the key positions of a 9200TEU container ship has been performed ,subjected to the rules of BV about fatigue strength specification of large container ships, based on design wave method and Miner fatigue cumulative damage theory analysis method. Wave loads have been computed using linear wave load calculation method based on three-dimensional potential flow theory. And the fatigue strength assessment of the typical hot spot structures has also been conducted based on a series of critical single design wave.

A practical method for torsional strength assessment of container ship structures

2004 ◽  
Vol 17 (5) ◽  
pp. 355-384 ◽  
Author(s):  
K. Iijima ◽  
T. Shigemi ◽  
R. Miyake ◽  
A. Kumano
Keyword(s):  
Practical Method ◽  
Container Ship ◽  
Ship Structures ◽  
Torsional Strength ◽  
Strength Assessment

Fatigue Strength Assessment of Crack Flaws in Thick High Tensile Steel Plates on Large Ships

2015 ◽  
Author(s):  
Yu Tian
Keyword(s):  
Fatigue Strength ◽  
Crack Growth ◽  
High Strength ◽  
Fatigue Performance ◽  
Container Ship ◽  
Near Surface ◽  
Strength Assessment ◽  
Deck Plate ◽  
Steel Grades ◽  
Fatigue Strength Assessment

The sizes of large container ship increased during the past years have accompanied by the use of thicker plate and higher steel grade. The fatigue performance of thick high strength steel plate is a problem which has to be investigated. As an example, the fatigue crack growth of the butt welds at the deck plate of a 8530 TEU container ship has been investigated. Crack growth life predication method in combination with failure assessment diagram (FAD) technology has been used to calculate the fatigue life and the critical crack length. It has been discussed the fatigue sensitivity of the steel grades, the plate thicknesses and the positions of initial defect in thickness direction. The FAD methodology used in this paper is a common approach which has been introduced in various standards, which is practical and useful in fatigue strength assessment of ship structures. Crack tip opening displacement (CTOD) tests of high tensile steel YP40 and YP 47 have been carried out to obtain the fracture toughness, which play an important role in FAD calculation. And the minimum value of the test results is used as the calculated value. It is concluded that the fatigue performance of high strength steels do not increase proportionally with the steel grades and plate thicknesses. The calculation results also have shown that there is significant decrease of fatigue performance along with the increase of plate thickness, and in the same initial conditions, the harmfulness of the near surface defects on structure detail is more serious compared to the embedded defects.

Effect of mesh on CFD aerodynamic performances of a container ship

2020 ◽  
Vol 20 (3) ◽  
pp. 343-353
Author(s):  
Ngo Van He ◽  
Le Thi Thai
Keyword(s):  
Water Surface ◽  
Reference Model ◽  
Full Scale ◽  
Scale Model ◽  
Container Ship ◽  
Ansys Fluent ◽  
Remarkable Effect ◽  
Aerodynamic Performances ◽  
Mesh Convergence

In this paper, a commercial CFD code, ANSYS-Fluent has been used to investigate the effect of mesh number generated in the computed domain on the CFD aerodynamic performances of a container ship. A full-scale model of the 1200TEU container ship has been chosen as a reference model in the computation. Five different mesh numbers for the same dimension domain have been used and the CFD aerodynamic performances of the above water surface hull of the ship have been shown. The obtained CFD results show a remarkable effect of mesh number on aerodynamic performances of the ship and the mesh convergence has been found. The study is an evidence to prove that the mesh number has affected the CFD results in general and the accuracy of the CFD aerodynamic performances in particular.

PENGKAJIAN KEKUATAN BETON STRUKTUR JEMBATAN PASCA KEBAKARAN

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Sudarmadi Sudarmadi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Strength Assessment ◽  
Concrete Testing

In this paper a case study about concrete strength assessment of bridge structure experiencing fire is discussed. Assessment methods include activities of visual inspection, concrete testing by Hammer Test, Ultrasonic Pulse Velocity Test, and Core Test. Then, test results are compared with the requirement of RSNI T-12-2004. Test results show that surface concrete at the location of fire deteriorates so that its quality is decreased into the category of Very Poor with ultrasonic pulse velocity ranges between 1,14 – 1,74 km/s. From test results also it can be known that concrete compressive strength of inner part of bridge pier ranges about 267 – 274 kg/cm2 and concrete compressive strength of beam and plate experiencing fire directly is about 173 kg/cm2 and 159 kg/cm2. It can be concluded that surface concrete strength at the location of fire does not meet the requirement of RSNI T-12-2004. So, repair on surface concrete of pier, beam, and plate at the location of fire is required.

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