Use of “Marker Blocks” As An Aid in Quantitative Fractography in Full-Scale Aircraft Fatigue Testing: A Case Study

2008 ◽  
pp. 285-285-24 ◽  
Author(s):  
RV Dainty
Keyword(s):  
Fatigue Testing ◽  
Full Scale ◽  
Quantitative Fractography

Use of DNVGL-RP-C203 for Determining the Fatigue Capacity of Connectors

2021 ◽  
Author(s):  
Anthony Muff ◽  
Anders Wormsen ◽  
Torfinn Hørte ◽  
Arne Fjeldstad ◽  
Per Osen ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Testing ◽  
Experimental Testing ◽  
High Strength ◽  
Element Model ◽  
Fatigue Analysis ◽  
Full Scale ◽  
The Finite Element Model

Abstract Guidance for determining a S-N based fatigue capacity (safe life design) for preloaded connectors is included in Section 5.4 of the 2019 edition of DNVGL-RP-C203 (C203-2019). This section includes guidance on the finite element model representation, finite element based fatigue analysis and determination of the connector design fatigue capacity by use of one of the following methods: Method 1 by FEA based fatigue analysis, Method 2 by FEA based fatigue analysis and experimental testing and Method 3 by full-scale connector fatigue testing. The FEA based fatigue analysis makes use of Appendix D.2 in C203-2019 (“S-N curves for high strength steel applications for subsea”). Practical use of Section 5.4 is illustrated with a case study of a fatigue tested wellhead profile connector segment test. Further developments of Section 5.4 of C203-2019 are proposed. This included acceptance criteria for use of a segment test to validate the FEA based fatigue analysis of a full-scale preloaded connector.

Manufacture of full-scale geopolymer cement concrete components: A case study to highlight opportunities and challenges

PCI Journal ◽  
2015 ◽  
Vol 60 (6) ◽  
pp. 39-50 ◽  
Author(s):  
Brett Tempest ◽  
Clarke Snell ◽  
Thomas Gentry ◽  
Maria Trejo ◽  
Keith Isherwood
Keyword(s):  
Full Scale ◽  
Cement Concrete ◽  
Geopolymer Cement

Full-Scale Application of Catalytic Ozonation for Drinking Water Treatment: Case Study in China

2014 ◽  
Vol 140 (9) ◽  
Author(s):  
Zheng-Qian Liu ◽  
Bang-Jun Han ◽  
Gang Wen ◽  
Jun Ma ◽  
Sheng-Jun Wang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Catalytic Ozonation ◽  
Full Scale

scholarly journals Prototyping and Validation of MEMS Accelerometers for Structural Health Monitoring—The Case Study of the Pietratagliata Cable-Stayed Bridge

2018 ◽  
Vol 7 (3) ◽  
pp. 30 ◽  
Author(s):  
Chiara Bedon ◽  
Enrico Bergamo ◽  
Matteo Izzi ◽  
Salvatore Noè
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Full Scale ◽  
Shaking Table ◽  
Efficient Design ◽  
Dynamic Identification ◽  
Structural Health ◽  
Cable Stayed Bridge ◽  
Mems Accelerometers

In recent years, thanks to the simple and yet efficient design, Micro Electro-Mechanical Systems (MEMS) accelerometers have proven to offer a suitable solution for Structural Health Monitoring (SHM) in civil engineering applications. Such devices are typically characterised by high portability and durability, as well as limited cost, hence resulting in ideal tools for applications in buildings and infrastructure. In this paper, original self-made MEMS sensor prototypes are presented and validated on the basis of preliminary laboratory tests (shaking table experiments and noise level measurements). Based on the well promising preliminary outcomes, their possible application for the dynamic identification of existing, full-scale structural assemblies is then discussed, giving evidence of their potential via comparative calculations towards past literature results, inclusive of both on-site, Experimental Modal Analysis (EMA) and Finite Element Analytical estimations (FEA). The full-scale experimental validation of MEMS accelerometers, in particular, is performed using, as a case study, the cable-stayed bridge in Pietratagliata (Italy). Dynamic results summarised in the paper demonstrate the high capability of MEMS accelerometers, with evidence of rather stable and reliable predictions, and suggest their feasibility and potential for SHM purposes.

scholarly journals Benefits of sub-component over full-scale blade testing elaborated on a trailing edge bond line design validation

2017 ◽  
Author(s):  
Malo Rosemeier ◽  
Gregor Basters ◽  
Alexandros Antoniou
Keyword(s):  
Structural Reliability ◽  
Fatigue Testing ◽  
Bond Line ◽  
Full Scale ◽  
Testing Time ◽  
Trailing Edge ◽  
Pure Lead ◽  
Component Testing ◽  
Line Design ◽  
Full Scale Testing

Abstract. Wind turbine rotor blades are designed and certified according to the current IEC (2012) and DNV GL AS (2015) standards, which include the final full-scale experiment. The experiment is used to validate the assumptions made in the design models. In this work the drawbacks of traditional static and fatigue full-scale testing are elaborated, i. e. the replication of realistic loading and structural response. Sub-component testing is proposed as a potential method to mitigate some of the drawbacks. Compared to the actual loading that a rotor blade is subjected to under field conditions, the full-scale test loading is subjected to the following simplifications and constraints: First, the full-scale fatigue test is conducted as a cyclic test, where the load time series obtained from aero-servo-elastic simulations are simplified to a damage equivalent load range. Second, the load directions are typically applied solely in two directions, often pure lead-lag and flap-wise directions which are not necessarily the most critical load directions for a particular blade segment. Third, parts of the blade are overloaded by up to 20 % to achieve the target load along the whole span. Fourth, parts of the blade are not tested due to load introduction via load frames. Finally, another downside of a state-of-the-art, uni-axial, resonant, full-scale testing method is that dynamic testing at the eigenfrequencies of today's blades in respect of the first flap-wise mode between 0.4 Hz and 1.0 Hz results in long test times. Testing usually takes several months. In contrast, the sub-component fatigue testing time can be substantially faster than the full-scale blade test since (a) the load can be introduced with higher frequencies which are not constrained by the blade's eigenfrequency, and (b) the stress ratio between the minimum and the maximum stress exposure to which the structure is subjected can be increased to higher, more realistic values. Furthermore, sub-component testing could increase the structural reliability by focusing on the critical areas and replicating the design loads more accurately in the most critical directions. In this work, the comparison of the two testing methods is elaborated by way of example on a trailing edge bond line design.

A Three-Dimensional Time-Dependent Icing Model for a Stern Trawler

1998 ◽  
Vol 42 (04) ◽  
pp. 266-273
Author(s):  
K. K. Chung ◽  
E. P. Lozowski
Keyword(s):  
Three Dimensional ◽  
Grid Cell ◽  
Full Scale ◽  
Time Dependent ◽  
Trajectory Modeling ◽  
Model Scale ◽  
Droplet Trajectory ◽  
Dangerous Condition

A full-scale spray flux equation has been derived for ship-generated spray using spraying data obtained from model-scale experiments. Using this equation, droplet trajectory modeling, and spray mass continuity, a full-scale spraying model, which includes the effect of wind drag, has been developed for the stern trawler Zandberg. This spraying model has been incorporated into an icing model for the same vessel. A three-dimensional grid cell mesh is superimposed on the surface of the ship so that the local spray flux and icing rate on each grid cell can be calculated using the combined spraying and icing models. The disappearance of the Blue Mist II is used as a case study to illustrate the performance of the icing model. Under these severe icing conditions with off-head winds, the model predicts an icing rate of more than 13 tonnes per hour for the Zandberg, and the ice distribution is highly asymmetrical. This ice loading is the most dangerous condition for the ship's stability.

Full-scale fatigue testing with initial damage as validation of FRP road bridge design

2016 ◽  
Author(s):  
Jan Hiddingh ◽  
Ronald Grefhorst ◽  
Martijn Veltkamp
Keyword(s):  
Structural Material ◽  
Fatigue Resistance ◽  
Fatigue Testing ◽  
Full Scale ◽  
Total Cost Of Ownership ◽  
Reinforced Polymers ◽  
Maintenance Costs ◽  
Total Cost ◽  
Cost Of Ownership ◽  
Positive Experiences

Bridges built in fibre reinforced polymers (FRP) bring the important advantage of low-maintenance costs, thus reducing the total cost of ownership. Various kinds of FRP-constructions have been built hundreds of times in the last decade, the technology is now beyond the stage of infancy. The Province of Groningen has positive experiences with bridges and lock gates built in FRP. For a 8m span lifting bridge for road usage, the province prescribed FRP as the structural material for the deck, and in parallel required additional validation of the material's fatigue resistance through fullscale testing.

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