Probabilistic Fatigue Assessment for Complex Engineering Structures with Time-dependent Surrogate Modelling

2021 ◽  
pp. 35-64
Author(s):  
Chengwei Fei ◽  
Lei Han ◽  
Cheng Lu ◽  
Yan Hu ◽  
Bo Huang ◽  
...  
Keyword(s):  
Time Dependent ◽  
Engineering Structures ◽  
Surrogate Modelling ◽  
Fatigue Assessment ◽  
Complex Engineering

scholarly journals COMPARATIVE ANALYSIS AND SELECTION OF TECHNOLOGY OF DEVICE OF FENCING METAL STRUCTURES IN CONSTRUCTION OF UNDERGROUND STRUCTURES

2021 ◽  
Vol 9 (1) ◽  
pp. 26-30
Author(s):  
Elena Korol ◽  
Zarina Chipova
Keyword(s):  
Underground Structures ◽  
Engineering Structures ◽  
Metal Structures ◽  
Large Cities ◽  
Long Time ◽  
Complex Engineering ◽  
Transport Problems ◽  
The Cost ◽  
Transport Complex ◽  
Selection Of

Urban motor transport complex engineering structures, the construction of which is carried out for a long time, and the cost is often tunnels of structures. Despite this, urban tunnels remain in demand as a means of solving transport problems, especially for large cities, in areas with dense urban development or an established architectural appearance, the violation of which is unacceptable. The construction of tunnels makes it possible to increase the throughput of highways, especially in places of large intersections, one of the diverting high-intensity transit traffic flows underground, making them invisible on the surface and thus not disrupting the existing historical appearance of the area.

Recent advances in reliability analysis of aeroengine rotor system: a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xue-Qin Li ◽  
Lu-Kai Song ◽  
Guang-Chen Bai
Keyword(s):  
Reliability Analysis ◽  
Surrogate Model ◽  
Engineering Application ◽  
Rotor System ◽  
Engineering Structures ◽  
Content Type ◽  
Reliability Design ◽  
Rotor Systems ◽  
Practical Engineering ◽  
Complex Engineering

PurposeTo provide valuable information for scholars to grasp the current situations, hotspots and future development trends of reliability analysis area.Design/methodology/approachIn this paper, recent researches on efficient reliability analysis and applications in complex engineering structures like aeroengine rotor systems are reviewd.FindingsThe recent reliability analysis advances of engineering application in aeroengine rotor system are highlighted, it is worth pointing out that the surrogate model methods hold great efficiency and accuracy advantages in the complex reliability analysis of aeroengine rotor system, since its strong computing power can effectively reduce the analysis time consumption and accelerate the development procedures of aeroengine. Moreover, considering the multi-objective, multi-disciplinary, high-dimensionality and time-varying problems are the common problems in various complex engineering fields, the surrogate model methods and its developed methods also have broad application prospects in the future.Originality/valueFor the strong demand for efficient reliability design technique, this review paper may help to highlights the benefits of reliability analysis methods not only in academia but also in practical engineering application like aeroengine rotor system.

scholarly journals Mechanical properties of lightweight concrete with sintered aggregate

2020 ◽  
Vol 323 ◽  
pp. 01005
Author(s):  
Anna M. Rogowska ◽  
Paweł M. Lewiński
Keyword(s):  
Tensile Strength ◽  
Power Plants ◽  
Lightweight Concrete ◽  
Building Structures ◽  
Engineering Structures ◽  
Concrete Shrinkage ◽  
Axial Tensile ◽  
Cylinder Strength ◽  
Complex Engineering

The objective of this paper is the determination of short-term properties of lightweight concrete with sintered aggregate. The aggregate material comes from the recycling of ashes from power plants, which yield granules after processing. The research was planned based on two concrete mixes. A series of tests was carried out in the ITB Laboratory of Building Structures, Geotechnics and Concrete. As a result of these tests, the following parameters were determined: secant modulus of elasticity and cylinder strength of concrete, cube strength of concrete, axial tensile strength, splitting tensile strength, flexural strength and concrete shrinkage. Knowledge of the tested parameters is necessary when designing prestressed structures, as well as accepting proven values for static calculations when designing complex engineering structures, including prestressed elements made of lightweight concrete.

scholarly journals Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 609
Author(s):  
Sergio Cicero ◽  
Thomas Metais ◽  
Yuliya Voloshyna ◽  
Sam Cuvillez ◽  
Sergio Arrieta ◽  
...  
Keyword(s):  
Real Data ◽  
Structural Components ◽  
Engineering Process ◽  
Specific Procedure ◽  
Fatigue Assessment ◽  
Different Types ◽  
Nuclear Component ◽  
Complex Engineering ◽  
Assessment Procedures

Nowadays, environmental fatigue assessment is mandatory in many countries, in the design and operational stages of nuclear structural components. The analysis of environmental fatigue can be a complex engineering process that is generally performed following national or international procedures. Such procedures are not always based on the same assumptions, and novel analysts may find a confusing variety of documents. Moreover, once a specific procedure has been chosen for the analysis, it is possible to complete the fatigue assessment by using design transients (and loads) or, alternatively, real loads provided by monitoring systems. In this context, this paper provides a comprehensive review of the different environmental fatigue assessment procedures and a brief description of the different types of load inputs (design vs. real data). The work is completed with a case study, in which the (fatigue) cumulative usage factor is estimated in a particular nuclear component by using one of the abovementioned assessment procedures (NUREG/CR-6909) and two options for the load inputs.

scholarly journals Experimental Investigation on the Viscoelastic Properties of Constituents in Mudstone

2020 ◽  
Author(s):  
Changlun Sun ◽  
Guichen Li ◽  
Gomah Mohamed Elgharib ◽  
Jiahui Xu ◽  
Haoyu Rong
Keyword(s):  
Large Deformation ◽  
Viscoelastic Model ◽  
Model Fitting ◽  
Maximum Load ◽  
Time Dependent ◽  
Underground Engineering ◽  
Engineering Structures ◽  
Sandstone Sample ◽  
Deformation And Failure ◽  
Deep Underground

Abstract In deep underground engineering, the creep behaviors of soft rocks have been widely investigated to help understand the mechanism of the time-dependent large deformation and failure of underground engineering structures. However, rocks were used to be regarded as homogeneous materials and there are limited studying results about the time-dependent properties of constituents in them to reveal their creep mechanism. In this context, the targeting nanoindentation technique (TNIT) was adopted to investigate the viscoelastic characteristics of kaolinite and quartz in a two-constituent mudstone sample. The TNIT consists of identifications of mineralogical constituents in mudstone and nanoindentation experiments on identified constituents. After conducting experiments, the unloading stages of the typical indentation curves were analyzed to calculate the hardness and elastic modulus of constituents in mudstone. And the 180 s load-holding stages with the maximum load of 50 mN were transformed to the typical creep strain-time curves for fitting analysis by using the Kelvin model, the standard viscoelastic model and the extended viscoelastic model. Fitting results show that the standard viscoelastic model can perfectly express the nanoindentation creep behaviors of both kaolinite and quartz and fitting constants are suitable to be used to calculate their creep parameters. The creep parameters of kaolinite are much smaller than that of quartz, which drives the time-dependent large deformation of the soft mudstone. At last, the standard viscoelastic model was verified on a sandstone sample.

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