A full-scale structural fatigue test program

With more than 50.000 tons in service to date, the Oil&Gas Industry has the need to understand the tension fatigue performance of grade R5 chains in straight tension, and corroborate the validity of the existing design methods. The chain fatigue design curves in API and DNV are based on fatigue tests obtained in the nineties and early two thousands. However the tests were performed on lower grades such as ORQ, R3 and R4, and small chains, 76 mm diameter being the largest studless chain tested. The industry has moved towards the use of large studless chains, especially in permanent units, where chain diameters above 150 mm are not unusual. This paper gathers information from a full scale fatigue test program on grade R4 and R5 studless chains, performed in seawater and with diameters between 70 mm and 171 mm. The chains being tested are actual production chains supplied for different drilling units and large permanently moored production floating units. The paper analyses the data and determines tension-tension fatigue curves based on API and DNV methods for computation of cumulative fatigue damage, regardless of other damaging mechanisms. Improved fatigue capacity is obtained with respect to the above recommended design methods.

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DC-10 full-scale fatigue test program

10.2514/6.1973-803 ◽

1973 ◽

Author(s):

M. STONE

Keyword(s):

Fatigue Test ◽

Full Scale ◽

Test Program

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On Development of Load Spectrum for Full Scale Fatigue Test of Trucks in Laboratory

10.4271/871283 ◽

1987 ◽

Author(s):

C. Arief ◽

P. Santika ◽

B. Prasetio

Keyword(s):

Fatigue Test ◽

Full Scale ◽

Load Spectrum

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TurkStream Collapse Test Program

Volume 5: Pipelines, Risers, and Subsea Systems ◽

10.1115/omae2018-78454 ◽

2018 ◽

Author(s):

Chris Timms ◽

Doug Swanek ◽

Duane DeGeer ◽

Arjen Meijer ◽

Ping Liu ◽

...

Keyword(s):

Thermal Ageing ◽

Full Scale ◽

The Black Sea ◽

Small Scale ◽

Test Program ◽

Line Pipe ◽

Medium Scale ◽

Collapse Resistance ◽

Full Scale Tests ◽

The Impact

The TurkStream pipeline project is designed to transport approximately 32 billion cubic meters of natural gas annually from Russia to Turkey under the Black Sea, with more than 85% of the deep-water route being deeper than 2000 m. The offshore section is intended to consist of two parallel lines, each approximately 900 km long. The preliminary stages of the front end engineering design (pre-FEED) phase was managed by INTECSEA. To support the analyses and design of the deepest portions, a full scale collapse test program was performed by C-FER Technologies (C-FER). This collapse test program, which included 62 full-scale collapse and pressure+bend tests, 54 medium-scale ring collapse tests, and hundreds of small-scale tests, was primarily aimed at measuring, quantifying and documenting the increase in pipe strength and collapse resistance resulting from the thermal induction heat treatment effect (thermal ageing) that arises during the pipe coating process. Two grades of 32-inch (813 mm) outside diameter (OD) line-pipe, SAWL450 and SAWL485 with wall thicknesses of 39.0 mm or 37.4 mm, respectively, were supplied from various mills for testing. The collapse test program objectives were as follows: • Determine the collapse resistance of line pipes originating from various pipe mills; • Determine the pressure+bend performance of line pipes originating from various pipe mills; • Measure the effect of thermal ageing on material and collapse testing results, including the impact of multiple thermal cycles; and • Evaluate the results of medium-scale ring collapse tests as compared to full-scale tests. This paper presents selected results of this work, along with some comparisons to predictive equations.

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Health Monitoring of the Aircraft Structure during a Full Scale Fatigue Test with Use of an Active Piezoelectric Sensor Network

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.220-221.328 ◽

2015 ◽

Vol 220-221 ◽

pp. 328-332

Author(s):

Michal Dziendzikowski ◽

Krzysztof Dragan ◽

Artur Kurnyta ◽

Sylwester Klysz ◽

Andrzej Leski

Keyword(s):

Signal Processing ◽

Damage Detection ◽

Crack Growth ◽

Fatigue Test ◽

Piezoelectric Sensor ◽

Full Scale ◽

Growth Monitoring ◽

Aircraft Structure ◽

System Functioning ◽

Signal Processing Methods

The paper presents an approach to develop a system for fatigue crack growth monitoring and early damage detection in the PZL – 130 ORLIK TC II turbo-prop military trainer aircraft structure. The system functioning is based on elastic waves propagation excited in the structure by piezoelectric PZT transducers. In the paper, a built block approach for the system design, signal processing as well as damage detection is presented. Description of damage detection capabilities are delivered in the paper and some issues concerning the proposed signal processing methods and their application to crack growth estimation models are discussed. Selected preliminary results obtained during the Full Scale Fatigue Test thus far are also presented.

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