scholarly journals Evaluation of a Distributed Fibre Optic Strain Sensing System for Full-Scale Fatigue Testing

2016 ◽  
Vol 2 ◽  
pp. 3784-3791 ◽  
Author(s):  
Claire Davis ◽  
Meg Knowles ◽  
Nik Rajic ◽  
Geoff Swanton
Keyword(s):  
Fatigue Testing ◽  
Full Scale ◽  
Fibre Optic ◽  
Strain Sensing ◽  
Sensing System

Application of a distributed fibre optic strain sensing system to monitoring changes in the state of an underground mine

2007 ◽  
Vol 18 (10) ◽  
pp. 3202-3210 ◽  
Author(s):  
Hiroshi Naruse ◽  
Hideki Uehara ◽  
Taishi Deguchi ◽  
Kazuhiko Fujihashi ◽  
Masatoshi Onishi ◽  
...  
Keyword(s):  
Underground Mine ◽  
The State ◽  
Fibre Optic ◽  
Strain Sensing ◽  
Sensing System

Multiplexed fibre-optic interferometric sensing system: combined frequency and time division

1988 ◽  
Vol 24 (7) ◽  
pp. 409 ◽  
Author(s):  
F. Farahi ◽  
J.D.C. Jones ◽  
D.A. Jackson
Keyword(s):  
Fibre Optic ◽  
Sensing System ◽  
Time Division

Coherence multiplexing of remote fibre optic fabry-perot sensing system

1988 ◽  
Vol 65 (5) ◽  
pp. 319-321 ◽  
Author(s):  
F. Farahi ◽  
T.P. Newson ◽  
J.D.C. Jones ◽  
D.A. Jackson
Keyword(s):  
Fibre Optic ◽  
Sensing System ◽  
Fabry Perot ◽  
Coherence Multiplexing

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.

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.

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