scholarly journals Estimate of the steel bridges fatigue life by application of the fracture mechanics

2018 ◽  
Vol 419 ◽  
pp. 012010
Author(s):  
J M Djoković ◽  
R R Nikolić ◽  
J Bujnák ◽  
B Hadzima
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Steel Bridges

Fatigue Reliability Evaluation of Old Steel Bridges Based on Probabilistic Fracture Mechanics

2006 ◽  
Vol 324-325 ◽  
pp. 435-438 ◽  
Author(s):  
Chun Sheng Wang ◽  
Jian Guo Nie ◽  
Ai Rong Chen ◽  
Wei Zhen Chen ◽  
Yue Xu
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Steel Bridges ◽  
Bridge Management ◽  
Fatigue Reliability ◽  
Original Design ◽  
Probabilistic Fracture Mechanics ◽  
Evaluation Models ◽  
Remaining Fatigue Life

There are many old steel bridges on Chinese transportation lines, which keep their normal traffic service function. The old bridges are often required to carry an increasing volume of traffic and heavier vehicles than the original design, so bridge management departments pay more attention to the actual remaining fatigue life of such structures. Based on probabilistic fracture mechanics theory, the member and the system fatigue failure evaluation models for old steel bridges are all proposed, and the fatigue reliability analysis program is developed using Monte-Carlo. As a case study, the evaluation models are used to predicate the fatigue reliability of Zhejiang Street Bridge. According to evaluation results, the probabilistic remaining fatigue life, safe inspection intervals and maintenance strategy are determined.

Thermal Fatigue and Fracture Mechanics Analysis of Aluminium Alloy

2011 ◽  
Vol 201-203 ◽  
pp. 2476-2480
Author(s):  
Wen Xiao Zhang ◽  
Guo Dong Gao ◽  
Guang Yu Mu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Fracture Mechanics ◽  
Thermal Fatigue ◽  
Low Carbon Steel ◽  
Strain Range ◽  
J Integral ◽  
Low Carbon ◽  
Thermal Fatigue Life ◽  
Energy Aspect

The in-phase and out-of-phase thermal fatigue of aluminum alloy were experimentally studied. The fatigue life was evaluated analytically by using the elastic-plastic fracture mechanics method (mainly J integral). The results of experiments and calculations showed that the life of out-of-phase fatigue was longer than that of in-phase fatigue within the same strain range. This is the same as the results of other materials such as medium and low carbon steel. On the other hand, the predicted life was consistent with experimental results. This suggests that J integral as a mechanics parameter for characterizing the thermal fatigue strength of aluminum alloy and the calculation method developed here is efficient. A parameter ΔW was proposed from energy aspect to characterize the capacity of crack propagation. The in-phase thermal fatigue life was the same as the out-of-phase thermal fatigue life for identical ΔW values.

Analysis on the Fatigue Life of Asphalt Pavement under Traffic Flow Loads

2013 ◽  
Vol 361-363 ◽  
pp. 1727-1734
Author(s):  
Meng Qi Gao ◽  
Ping Ying Wang ◽  
He Ping Ding
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Fatigue Fracture ◽  
Fatigue Damage ◽  
Asphalt Pavement ◽  
Ansys Software ◽  
Element Analysis ◽  
Damage Area ◽  
Traffic Loads ◽  
Damage Rule

To study the fatigue life of asphalt pavement under traffic loads, a 3-D finite element analysis (FEA) Visio-elastic road model was established on the layered theory with ANSYS software. The fatigue damage was calculated with the maximum horizontal tensile strain of asphalt layer bottom based on the fatigue fracture mechanics, when single axis went across. Then the fatigue life was obtained after the fatigue damage occurred in some degree by the Miners linear cumulative damage rule. The results show that it taken 3.4 years when the damage area reached 10% of wheel path area, and 4.5years when reached 45%; while the calculated result was 5.5 years by axial-load conversion method. The analysis shows that the fatigue life of asphalt pavement calculated by fatigue fracture mechanics rule has more significance in practice.

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