Accelerated testing for long-term fatigue strength of various FRP laminates for marine use

2009 ◽  
Vol 69 (6) ◽  
pp. 805-813 ◽  
Author(s):  
Masayuki Nakada ◽  
Yasushi Miyano
Keyword(s):  
Fatigue Strength ◽  
Accelerated Testing

Correlation of Connector Contact Failures in Accelerated Testing and in Long-term Use Field Vehicles

2019 ◽  
Author(s):  
Jian Song ◽  
Haomiao Yuan ◽  
Abhay Shukla ◽  
Christian Koch ◽  
Dirk Hilmert
Keyword(s):  
Accelerated Testing

Accelerated testing method to estimate the long‐term hydrostatic strength of semi‐crystalline plastic pipes

2019 ◽  
Vol 60 (5) ◽  
pp. 879-888 ◽  
Author(s):  
Mehrzad Taherzadehboroujeni ◽  
Roozbeh Kalhor ◽  
Gregory B. Fahs ◽  
Robert B. Moore ◽  
Scott W. Case
Keyword(s):  
Accelerated Testing ◽  
Testing Method ◽  
Plastic Pipes

Accelerated Testing for Long-term Durability of FRP Laminates for Marine Use

2005 ◽  
Vol 39 (1) ◽  
pp. 5-20 ◽  
Author(s):  
Yasushi Miyano ◽  
Masayuki Nakada ◽  
Naoyuki Sekine
Keyword(s):  
Accelerated Testing

Fatigue Strength and Metal Condition in the Context of Gas Turbine Buckets Life Extension

2012 ◽  
Author(s):  
Sergey A. Ivanov ◽  
Alexander I. Rybnikov
Keyword(s):  
Fatigue Strength ◽  
Service Life ◽  
Gas Turbine ◽  
Fatigue Resistance ◽  
Gas Turbines ◽  
Life Extension ◽  
Term Operation ◽  
Life Estimation ◽  
Metal Properties

Criteria for remaining life estimation and methods for enhancing fatigue resistance of heavy-duty gas turbine bucket metal are based on the analysis of changes in the structure and properties of metal after long-term operation. High-cycle fatigue (HCF) resistance is shown to be a decisive characteristic in the residual life estimation of turbine buckets after operation over 100,000 hours. The tests of the buckets from cast and wrought nickel-based alloys after long-term operation demonstrated decreasing of fatigue strength by up to 25%. The metal structure in operation undergoes notable deterioration mainly in phase redistribution. The size and configuration of metal phases are changing also. It caused the changes in metal properties. The decrease of the bucket fatigue strength correlates with the decrease of metal ductility. The reconditioning heat treatment resulted in restoring mechanical properties of metal. The fatigue resistance also increased nearly to the initial level. The influence of operational factors on bucket fatigue strength deterioration has been established. The mechanical damages on bucket airfoil may decrease the fatigue resistance. We found the correlation of endurance limit and damages depth. The procedures for metal properties recovering and buckets service life substantial extension have been developed. It has resulted in the extension of the buckets service life by up to 50% over the assigned life in gas turbines operated by Gazprom.

Accelerated testing for long-term strength of innovative CFRP laminates for marine use

2008 ◽  
Vol 39 (1) ◽  
pp. 5-12 ◽  
Author(s):  
Yasushi Miyano ◽  
Masayuki Nakada ◽  
Jun Ichimura ◽  
Eiji Hayakawa
Keyword(s):  
Accelerated Testing ◽  
Term Strength ◽  
Cfrp Laminates
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