Fatigue Assessment of Aluminum Ship Details by Hot-Spot Stress Approach

2011 ◽  
Author(s):  
Ba˚rd Wathne Tveiten ◽  
Stig Berge ◽  
Xiaozhi Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hot Spot ◽  
Fatigue Tests ◽  
Stress Range ◽  
Extrapolation Methods ◽  
The Finite Element Method ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Modeling Techniques

This paper presents a robust methodology for fatigue assessment of aluminum ship details using a hot-spot stress range approach. A series of fatigue tests of a typical aluminum ship detail was carried out to obtain a design S-N curve. The test detail was analyzed by the finite element method (FEM) using several modeling techniques and element types. Recommendations are given on finite element modeling practice, extrapolation methods and design S-N curves.

Fatigue Assessment of Aluminum Ship Details by Hotspot Stress Approach

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Bård Wathne Tveiten ◽  
Stig Berge ◽  
Xiaozhi Wang
Keyword(s):  
Finite Element ◽  
Hot Spot ◽  
Experimental Tests ◽  
Fatigue Tests ◽  
Stress Range ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Modeling Techniques

This paper presents a robust methodology for fatigue assessment of aluminum ship details using a hot-spot stress range approach. A series of fatigue tests of a typical aluminum ship detail was carried out to obtain a design S–N curve. The test detail was analyzed by the finite element method using several modeling techniques and element types. The results from both experimental tests and finite element analysis are discussed. Recommendations on the procedure of fatigue assessment of aluminum ships including S–N curve to be used are also presented.

Fatigue assessment of a steel truss bridge based on multi-dimensional finite element modelling

2021 ◽  
Author(s):  
Kris Hectors ◽  
Hans De Backer ◽  
Lien Saelens ◽  
Wim De Waele
Keyword(s):  
Finite Element ◽  
Decision Support ◽  
Finite Element Modelling ◽  
Hot Spot ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Railway Bridges ◽  
Element Modelling ◽  
Railway Traffic ◽  
Steel Truss Bridge

<p>This paper presents a multidimensional finite element modelling approach for the fatigue assessment of welded railway bridges based on a case study of a railway bridge in Belgium. The nominal stress approach of Eurocode 3 is compared to a hot spot stress based fatigue life calculation for the standardized fatigue load models for railway traffic. Hot spot stresses are calculated with an in-house developed framework that allows automated determination of hot spot stresses. It is discussed how this work can fit in a larger decision support system in the scope of structural health monitoring. The presented approach proves to be better for decision support compared to the conventional approach in the Eurocode.</p>

scholarly journals Influence of Production Process and Material Factors on Fatigue Strength of Tubular Stabilizer Bar / Wpływ Procesu Produkcyjnego I Czynników Materiałowych Na Wytrzymałość Zmęczeniową Stabilizatora Rurowego

2015 ◽  
Vol 60 (4) ◽  
pp. 2485-2492 ◽  
Author(s):  
A.M. Wittek ◽  
R. Burdzik ◽  
P. Folęga ◽  
Ł. Konieczny ◽  
B. Łazarz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Strength ◽  
Production Process ◽  
Wall Thickness ◽  
Fatigue Tests ◽  
Outer Diameter ◽  
The Finite Element Method ◽  
Premature Failure ◽  
Relationship Of

The paper presented results of the research on process of production of highly important element of passenger car. The main object of the research was influence of production process and material factors on fatigue strength of tubular stabilizer bar. The scope of the research included the stabilizer bar hot bent at the bending table, hardened in oil and tempered. The bending radii I, II and III were metalographically tested. The stabilizer bar was also subjected to fatigue tests. For analysis purpose the finite element method (FEM) calculation have been conducted. The analysis of relationship of outer diameter to wall thickness is very important. The analysed bar has broken early. The paper presents the reasons for premature failure of the tubular stabilizer bar.

Probabilistic S-N Fatigue Assessment Methods for Welded Joints in Offshore Structures

2008 ◽  
Author(s):  
A. Muhammed ◽  
A. Stacey
Keyword(s):  
Welded Joints ◽  
Hot Spot ◽  
Offshore Structures ◽  
Assessment Methods ◽  
Nominal Stress ◽  
Stress Range ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Jacket Structures ◽  
Stress Estimation

A study of probabilistic fatigue assessment methods for offshore structures confirmed that fatigue life predictions for offshore welded joints is dominated by uncertainties in hot spot stress estimation, arising from uncertainties in nominal stress and stress concentration factors. Analysis of data from previous fatigue studies on North Sea jacket structures conducted in the late 1980s suggests that nominal stresses are, in general, overestimated by about 30% and the COV of the bias is about 0.35. The study demonstrated that in-service fatigue failure probability is not only dependent on the COV but also on the median bias of the nominal stress range. A number of nominal stress COVs are recommended with associated median values for general offshore application. Distributions are also suggested for other variables such as Miner’s damage sum and the S-N design curve coefficients. Methods based on long-term stress range distribution with random parameters to cater for uncertainties in stress estimation are described and example calculations are given.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

Sign in / Sign up

Export Citation Format

Share Document