Methods for hull structure strength analysis and ships service life evaluation, for a large LNG carrier

2009 ◽  
pp. 77-90
Keyword(s):  
Service Life ◽  
Strength Analysis ◽  
Life Evaluation ◽  
Hull Structure ◽  
Structure Strength

Numerical Methods for Hull Structure Strength Analysis and Ships Service Life Evaluation, for a LPG Carrier

2008 ◽  
Author(s):  
Leonard Domnisoru ◽  
Dumitru Dragomir ◽  
Alexandru Ioan
Keyword(s):  
Service Life ◽  
Dynamic Response ◽  
Ship Hull ◽  
Design Stage ◽  
Head Wave ◽  
Strength Analysis ◽  
Response Analysis ◽  
Wave Loads ◽  
Life Evaluation ◽  
Hull Structure

In this paper the authors focus on the ship hull structure strengths and fatigue analyses, in order to estimate the ship service life period at the initial design stage. The topic of the paper is divided in three-interlinked parts. The first part includes the method for the hull strength analysis, based on 3D/1D-FEM models, under equivalent quasi-static head wave loads. The second part presents the method for the ship hull dynamic response analysis, based on non-linear hydroelasticity theory with second order wave spectrum. The last part includes the fatigue analysis method for the initial ship hull structure, based on the long-term prediction ship dynamic response, the cumulative damage ratio and the design S-N material curves. The numerical analyses are carried out for a LPG carrier with independent cargo-tanks type A. Two significant load cases are considered: full and ballast. The numerical results outline the extreme wave loads and the ships initial service life evaluation.

Structure Strength Analysis for Universal Coupling of Medium Thickness Plate Mill Based on FEM

2013 ◽  
Vol 321-324 ◽  
pp. 1794-1798
Author(s):  
Li Kun Guan ◽  
Wei Dong Liu ◽  
Ning Ning Wang
Keyword(s):  
Optimization Design ◽  
Maximum Load ◽  
Coupling Model ◽  
Strength Analysis ◽  
Plate Mill ◽  
Medium Thickness ◽  
Element Analysis ◽  
Fork Head ◽  
Structure Strength ◽  
Universal Coupling

In this paper,in view of the fork head often broken of the main drive system of a medium thickness plate mill,finite element analysis software ANSYS is used to establish universal coupling model and analyse static strength of the universal coupling, woning maximum stress value of the fork head and cross shaft at maximum load and analysing fracture reason of the fork,which could provide a theoretical basis for the cross shaft universal coupling strength analysis and structural optimization design.

Study on the Design of SMA Mixture on Expressway

2014 ◽  
Vol 496-500 ◽  
pp. 2582-2585
Author(s):  
Jian Ping Xu ◽  
Fu Ming Liu
Keyword(s):  
Service Life ◽  
Laboratory Test ◽  
Material Properties ◽  
Road Traffic ◽  
Jiangxi Province ◽  
Skid Resistance ◽  
Maintenance Costs ◽  
Modified Asphalt ◽  
Superior Surface ◽  
Structure Strength

The rapid growth of road traffic brings some requirements on driving comfort and safety, which include good smoothness, skid resistance and reduced noise of the pavement. SMA has adequate structure strength to reduce rutting and provide superior surface function of skid resistance. Modified asphalt as mixture binder, has considerable durability to ensure the service life with less maintenance costs. Associated with laboratory test and trial section, some suggestion and requirements are brought forward in this paper for the material properties and mixture design of SMA on the FuZhou-JiAn expressway in Jiangxi Province.

Analysis on Concrete Neutralization and Life Evaluation of Reinforced Concrete Chimney

2013 ◽  
Vol 671-674 ◽  
pp. 1672-1675
Author(s):  
Yan Hui Li ◽  
Yang Yang Zhang ◽  
Jing Cun Wei ◽  
Yun Feng Wu
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Concrete Structure ◽  
Concrete Cover ◽  
Initiation Time ◽  
Reinforcement Corrosion ◽  
Single Factor ◽  
Routine Examination ◽  
Life Evaluation ◽  
Reinforced Concrete Chimney

Through calculation and analysis on routine examination and neutralization of reinforced concrete chimney, the service life of concrete structure was evaluated only considering neutralization of concrete single factor. The results show that the neutralization of the reinforced concrete chimney was serious than that of other similar projects. The initiation time of reinforcement corrosion were 19.3a, cracking time of concrete cover were 27.35a.

Global Structure Strength Analysis of SWATH Based on Direct Calculate Method

2014 ◽  
Vol 633-634 ◽  
pp. 1002-1006
Author(s):  
Chun Bo Zhen ◽  
Liang Feng ◽  
Guo Chun Lu ◽  
Yuan Hang Hou
Keyword(s):  
Stress Concentration ◽  
Boundary Conditions ◽  
Element Model ◽  
Global Structure ◽  
Strength Analysis ◽  
Response Analysis ◽  
Structure Response ◽  
Result Show ◽  
Design Loads ◽  
Structure Strength

The stress concentration of SWATH’s cross-deck structure is serious and the problem of its structure strength appears particularly important. In this paper, A 3-D global element model of SWATH was built, the design Loads, load cases and boundary conditions were studied. on the base of that, the structure response analysis was completed. The result show that the global ship’s stress is small in all load cases of head seas and oblique seas, and the bulkheads have serious stress concentration phenomenon in beam seas.The result can offer the reference for SWATH’s design and development.

Structure Strength Analysis on a Steel Chimney Outer Wall with Three Spiral Guide Plates

2014 ◽  
Vol 513-517 ◽  
pp. 2625-2628
Author(s):  
Xu Lei Deng ◽  
Jia Ning He ◽  
Chao Zhang
Keyword(s):  
Flexural Strength ◽  
Fluid Mechanics ◽  
Outer Wall ◽  
Wind Loads ◽  
Strength Analysis ◽  
Structure Stability ◽  
Static Force ◽  
Force Analysis ◽  
Structure Strength ◽  
Ansys Workbench

Study on a steel chimney outer wall with three spiral guide plates in this paper. Research the steel chimney structure stability and static force analysis under wind loads by using ANSYS Workbench and CFX fluid mechanics modular. To prove the steel chimney with three spiral guide plates structure is more safe and stable than the old steel chimney. Provides a new transformation basis of the steel chimney as the ratio of height to diameter is large and low flexural strength.

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