Fatigue damage test and analysis of U-ribs butt weld of steel orthotropic deck

Extremely-Low-Cycle Fatigue Damage for Beam-to-Column Welded Joints Using Structural Details

Materials ◽

10.3390/ma13071768 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1768

Author(s):

Lizhen Huang ◽

Weilian Qu ◽

Ernian Zhao

Keyword(s):

Fatigue Damage ◽

Welded Joints ◽

Low Cycle Fatigue ◽

Damage Model ◽

Multiaxial Fatigue ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Butt Weld ◽

Damage Models ◽

Structural Details

The multiaxial fatigue critical plane method can be used to evaluate the extremely-low-cycle fatigue (ELCF) damage of beam-to-column welded joints in steel frameworks subjected to strong seismic activity. In this paper, fatigue damage models using structural detail parameters are studied. Firstly, the fatigue properties obtained from experiments are adopted to assess ELCF life for steel frameworks. In these experiments, two types of welded specimens, namely, plate butt weld (PB) and cruciform load-carrying groove weld (CLG), are designed according to the structural details of steel beam and box column joints, in which both structural details and welded factors are taken into account. Secondly, experiments are performed on three full-scale steel welded beam-to-column joints to determine the contribution of stress and/or strain to damage parameters. Finally, we introduce a modification of the most popular fatigue damage model of Fatemi and Socie (FS), modified by us in a previous study, for damage evaluation, and compare this with Shang and Wang (SW) in order to examine the applicability of the fatigue properties of PB and CLG. This study shows that the modified FS model using the fatigue properties of CLG can predict the crack initiation life and evaluate the damage of beam-to-column welded joints, and can be subsequently used for further investigation of the damage evolution law.

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Fatigue Damage Estimation of Welded Joints Considering Mechanochemical Interaction

Volume 3A: Structures, Safety and Reliability ◽

10.1115/omae2017-62315 ◽

2017 ◽

Author(s):

Gang Liu ◽

Yi Huang ◽

Qi Zhang ◽

Zhiyuan Li ◽

Jingjie Chen ◽

...

Keyword(s):

Corrosion Rate ◽

Fatigue Damage ◽

Coupling Effect ◽

Hot Spot ◽

Plate Thickness ◽

High Stress ◽

Uniform Corrosion ◽

Hot Spot Stress ◽

Butt Weld ◽

Applied Loading

The high stress region around weld joints accelerates corrosion and may induce non-uniform corrosion. In this study, the effect of loading on corrosion behavior of the steel in NaCl solution was investigated. The relationship between the corrosion rate and applied loading was deduced based on the electrochemical theory. Electrochemical experiments were carried out to investigate the interaction between loading and corrosion rate on Q235 steel. A butt weld joint of ship deck structure was selected as a case study. Time-dependent stress concentration factor of welded joint as a function of the corrosion deterioration was analyzed, and the iterative process of stress and corrosion degeneration of plate thickness was used to simulate the coupling effect based on results of the experiment. The hot spot stress approach was adopted to calculate the fatigue damage.

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Creep Fatigue Damage Assessment of V-Butt Weld Pipe With an Extended Direct Steady Cycle Analysis

Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Rudy Scavuzzo Student Paper Symposium and 26th Annual Student Paper Competition ◽

10.1115/pvp2018-84568 ◽

2018 ◽

Author(s):

Manu Puliyaneth ◽

Haofeng Chen ◽

Weiling Luan

Keyword(s):

Fatigue Damage ◽

Power Plants ◽

Mechanical Load ◽

Axial Stress ◽

Load Level ◽

Cyclic Plasticity ◽

Butt Weld ◽

Creep Fatigue ◽

Welded Pipe ◽

The Impact

One of the methods to increase the efficiency of power plants is by increasing their operating temperature, this can lead to various damage mechanisms due to creep-cyclic plasticity interactions such as creep ratcheting, cyclically enhanced creep and creep enhanced plasticity. In the presence of welds, their assessments are complicated due to the presence of different material zones, namely parent metal, weld metal and heat affected zone which exhibit different properties. This paper aims at investigating the creep-fatigue damage of a V-butt welded pipe under a constant mechanical load and a cyclic temperature load, considering full interaction between creep and cyclic plasticity using the extended Direct Steady Cycle Analysis (eDSCA) within the Linear Matching Method Framework (LMMF). The impact of applied load level and creep dwell on the failure mechanism and location is investigated. Influence of hoop to axial stress ratio and groove angle is studied comprehensively by choosing ranges covering majority of common pipe configurations. Further validation of results is carried out by using detailed step-by-step inelastic analyses in ABAQUS, thereby demonstrating the accuracy and efficiency of LMM eDSCA in predicating the remaining life of multi-material components such as a welded pipe, combining with appropriate creep and fatigue damage models.

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Fatigue Damage Evaluation and Retrofit of Steel Orthotropic Bridge Decks

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.413-414.741 ◽

2009 ◽

Vol 413-414 ◽

pp. 741-748 ◽

Cited By ~ 2

Author(s):

Chung Sheng Wang ◽

Ya Cheng Feng ◽

Lan Duan

Keyword(s):

Fatigue Damage ◽

Fatigue Cracks ◽

Bridge Decks ◽

High Capacity ◽

Suspension Bridge ◽

Repeated Loading ◽

Damage Analysis ◽

Deck Plate ◽

Fatigue Damage Analysis ◽

Steel Orthotropic Deck

Since the first application of steel orthotropic deck in bridges, engineers have shown great interest in the popularization of steel decks, based on their various advantages like light-weight, high capacity and so on. However, because of their complex configurations, repeated loading, and stress concentration, many details of steel orthotropic bridge decks are fatigue-sensitive. Recently, considerable increase in traffic volume and wheel loads has caused a number of fatigue cracks in steel orthotropic bridge decks in China. For example, bridge engineers have detected thousands of fatigue cracks in steel orthotropic deck on the main box girder of Humen Bridge only ten years after opening to traffic, which is the first modern suspension bridge with the main span of 888 meters in China. So the bridge owners pay more attention to evaluate the locations of fatigue damages. In current paper, the standard section of the real bridge deck was simulated and a kind of typical fatigue cracks was selected to analyze their fatigue life using S-N curve, the fatigue damage analysis was carried out on the longitudinal ribs to deck plate connections. The fatigue damage analysis results were consistent with the observations from real bridge decks.

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A Procedure to Include the Additional Fatigue Effects of Thermal Gradients in a B31.1 Butt Weld of Dissimilar Metals and Welding End Transition of Similar Metals for Design and Plant Life Extension

Journal of Pressure Vessel Technology ◽

10.1115/1.4005389 ◽

2012 ◽

Vol 134 (2) ◽

Author(s):

David H. Creates

Keyword(s):

Power Plant ◽

Fatigue Damage ◽

Power Plants ◽

Pressure Vessels ◽

Life Extension ◽

Dissimilar Metals ◽

Thermal Gradients ◽

Plant Design ◽

Butt Weld ◽

Plant Life

Fatigue evaluation in B31.1-2007 is currently done in accordance with para. 102.3.2 and generally considers only the stresses due to displacement load ranges and other cyclic loads. Yet fatigue damage is also occurring due to thermal gradients which are not considered. To exacerbate and complicate this additional type of fatigue damage, power plant design pressures and temperatures are rising, new materials are being introduced, pipes and attached components are becoming increasingly thick, and owners are requiring power plants to heat-up and cool-down at faster rates. Also, power plant owners are more and more interested in extending the life of power plants beyond their original design life. Although the fatigue design of ASME nuclear Class 1 piping components has long required thermal gradients to be considered, no attempt has been made to incorporate this knowledge into the B31.1 Power Piping Code (other than Creates, D. H., 2009, “A Procedure to Evaluate a B31.1 Welding End Transition Joint to Include the Fatigue Effects of Thermal Gradients for Design and Plant Life Extension,” PVP2009-77148, Proceedings of the ASME 2009 Pressure Vessels and Piping Conference, Volume 3, Design and Analysis, A. Segall, ed., ASME, New York, PVP-Vol. 3, pp. 101–110). To address this pressing need in today’s power plant environment this paper now provides a fully comprehensive methodology for assessing an “as-welded” Butt weld of dissimilar metals and a Welding End Transition (B31.1-2007, Fig. 127.4.2) of similar metals to include the additional fatigue effects of thermal gradients calculated in accordance with ASME Section III-2007 Subarticle NB-3600. The disadvantage of this approach is that the conservatism in these calculations may produce unacceptable results. In that case, this assessment is a warning that something else needs to be done by way of monitoring, modifying the design or the thermal operation, or performing a more rigorous evaluation. The advantage of this methodology is that it maintains the traditional B31.1 approach to fatigue with the same limit of SA except that there is now an additional term, STG, to account for the fatigue contribution due to thermal gradients. Considering the effects of thermal gradients in this way will further help to preserve the integrity of the piping pressure boundary and consequently, the safety of personnel in today’s power plants and into the future.

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