Hot spot stress approach for Tsing Ma Bridge fatigue evaluation under traffic using finite element method

2005 ◽  
Vol 19 (3) ◽  
pp. 261-279 ◽  
Author(s):  
T.H.T. Chan ◽  
T.Q. Zhou ◽  
Z.X. Li ◽  
L. Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hot Spot ◽  
Hot Spot Stress ◽  
Tsing Ma Bridge ◽  
Fatigue Evaluation ◽  
Element Method

Hot Spot Stress Analysis of Fatigue for Tsing Ma Bridge Critical Members under Traffic Using Finite Element Method

2007 ◽  
Vol 353-358 ◽  
pp. 925-928 ◽  
Author(s):  
Tai Quan Zhou ◽  
Tommy Hung Tin Chan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Hot Spot ◽  
Suspension Bridge ◽  
Element Analysis ◽  
Hot Spot Stress ◽  
Traffic Loading ◽  
Tsing Ma Bridge ◽  
Fatigue Evaluation

The suspension bridge has more flexibility and repetitive vehicles produce stress cycles in members. Then fatigue of the member is accumulated with the daily traffic loadings. In order to evaluate the working condition of the Tsing Ma Bridge, the online monitoring health system has been installed in long suspension bridge. The location of the strain sensor is not exactly at the critical member locations. The hot spot stress analysis for critical members is necessary for accurate fatigue evaluation of the bridge. The global finite element analysis of the Tsing Ma Bridge under traffic loading is performed to determine the critical fatigue member locations. A detailed local finite element analysis for the welded connections is performed to determine the hot spot stress of critical fatigue location. As a case for study, the calculated stress concentration factor is combined with the nominal representative stress block cycle to obtain the representative hot spot stress range cycle block under traffic loading from online health monitoring system. The comparison result shows that the nominal stress approach cannot consider the most critical stress of the fatigue damage location and the hot spot stress approach is more appropriate for fatigue evaluation.

scholarly journals Quasi-3-D spectral wavelet method for a thermal quench simulation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jonas Bundschuh ◽  
Laura A. M. D’Angelo ◽  
Herbert De Gersem
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spectral Method ◽  
Degrees Of Freedom ◽  
Hot Spot ◽  
Longitudinal Direction ◽  
Particle Accelerators ◽  
Wavelet Basis ◽  
Element Simulation ◽  
Element Method

AbstractThe finite element method is widely used in simulations of various fields. However, when considering domains whose extent differs strongly in different spatial directions a finite element simulation becomes computationally very expensive due to the large number of degrees of freedom. An example of such a domain are the cables inside of the magnets of particle accelerators. For translationally invariant domains, this work proposes a quasi-3-D method. Thereby, a 2-D finite element method with a nodal basis in the cross-section is combined with a spectral method with a wavelet basis in the longitudinal direction. Furthermore, a spectral method with a wavelet basis and an adaptive and time-dependent resolution is presented. All methods are verified. As an example the hot-spot propagation due to a quench in Rutherford cables is simulated successfully.

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.

scholarly journals Analysis of Electrical Impedance Myography Electrodes Configuration for Local Muscle Fatigue Evaluation Based on Finite Element Method

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 172233-172243
Author(s):  
Dongming Li ◽  
Linnan Huang ◽  
Yangrong Wen ◽  
Yueming Gao ◽  
Zeljka Lucev Vasic ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Muscle Fatigue ◽  
Electrical Impedance ◽  
Fatigue Evaluation ◽  
Local Muscle Fatigue ◽  
Element Method

Stress assessment and fatigue behavior evaluation of components with defects based on the finite element method and lock-in thermography

2014 ◽  
Vol 229 (7) ◽  
pp. 1194-1205 ◽  
Author(s):  
Junling Fan ◽  
Xinglin Guo ◽  
Chengwei Wu ◽  
Yanguang Zhao ◽  
Qiang Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Behavior ◽  
The Finite Element Method ◽  
Stress Concentration Factors ◽  
Fatigue Evaluation ◽  
Status Analysis ◽  
Lock In ◽  
Intrinsic Dissipation ◽  
Element Method

The relationships between the stress concentration factors Kts to the depths h and diameters Φ of blind holes were investigated based on the finite element method. The E-Mode, built-in the lock-in thermographic technique, was used to determine the stress distribution around blind holes and to predict the variation of Kts. Good predictions were achieved between the thermography and finite element method. The Altair Li software and Altair software were, separately, used to study the variations of the intrinsic dissipation and temperature increment during fatigue process for the purpose of damage status analysis. These two signals were considered as fatigue damage markers to rapidly predict the fatigue limits of components with different blind holes and then to determine the fatigue notch coefficient Kf. Theoretical results validate the capability of the lock-in thermography for fatigue evaluation.

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.

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