Sonic IR crack detection of aircraft turbine engine blades with multi-frequency ultrasound excitations

2014 ◽  
Author(s):  
Ding Zhang ◽  
Xiaoyan Han ◽  
Golam Newaz
Keyword(s):  
Crack Detection ◽  
Turbine Engine ◽  
Sonic Ir ◽  
Frequency Ultrasound

Improvements on FEA with a two-step simulation of experimental procedures in turbine blade crack detection in sonic IR NDE

2013 ◽  
Author(s):  
Ding Zhang ◽  
Xiaoyan Han ◽  
Golam Newaz ◽  
Lawrence D. Favro ◽  
Robert L. Thomas
Keyword(s):  
Turbine Blade ◽  
Crack Detection ◽  
Blade Crack ◽  
Sonic Ir

G0301306 Effects of rust in the crack face on crack detection based on Sonic-IR method

2015 ◽  
Vol 2015 (0) ◽  
pp. _G0301306--_G0301306-
Author(s):  
Y. HARAI ◽  
Y. IZUMI ◽  
H. TANABE ◽  
T. TAKAMATSU ◽  
T. SAKAGAMI
Keyword(s):  
Crack Detection ◽  
Crack Face ◽  
Sonic Ir

A Tool for Probabilistic Damage Tolerance of Hole Features in Turbine Engine Rotors

2012 ◽  
Author(s):  
Michael P. Enright ◽  
R. Craig McClung ◽  
Wuwei Liang ◽  
Yi-Der Lee ◽  
Jonathan P. Moody ◽  
...  
Keyword(s):  
Finite Element ◽  
Gas Turbine ◽  
Crack Growth ◽  
Crack Detection ◽  
Damage Tolerance ◽  
Federal Aviation Administration ◽  
High Energy ◽  
Probability Of Detection ◽  
Design Assessment ◽  
Turbine Engine

Over the past two decades, the Federal Aviation Administration (FAA) and the aircraft engine industry (organized through the Rotor Integrity Sub-Committee (RISC) of the Aerospace Industries Association) have been developing enhanced life management methods to address the rare but significant threats posed by undetected material or manufacturing anomalies in high-energy rotating components of gas turbine engines. This collaborative effort has led to the release of several FAA advisory circulars providing guidance for the use of probabilistic damage tolerance methods as a supplement to traditional safe-life methods. The most recent such document is Advisory Circular (AC) 33.70-2 on “Damage Tolerance of Hole Features in High-Energy Turbine Rotors.” In parallel with this effort, the FAA has also been funding research and development activities to develop the technology and tools necessary to implement the new methods, including a series of grants led by Southwest Research Institute® (SwRI®). The most significant outcome of these grants is a probabilistic damage tolerance computer code called DARWIN® (Design Assessment of Reliability With INspection). DARWIN integrates finite element models and stress analysis results, fracture mechanics models, material anomaly data, probability of crack detection, and uncertain inspection schedules with a user-friendly graphical user interface (GUI) to determine the probability of fracture of a rotor disk as a function of operating cycles with and without inspection. This paper provides an overview of new DARWIN models and features that directly support implementation of the new AC on hole features. The paper also simultaneously provides an overview of the AC methodology itself. Component geometry and stresses are addressed through an interface with commercial three-dimensional finite element (FE) models, including management of multiple load steps and multiple missions. Calculations of fatigue crack growth (FCG) life employ a unique interface with the FE models, sophisticated new stress intensity factor solutions for typical crack geometries at holes, shakedown modules, a menu of common FCG equations, and algorithms to address the effects of varying temperatures on crack growth rates. The primary random variables are based on the default anomaly distributions and probability-of-detection (POD) curves provided directly in the AC. Fracture risk is computed on a per-feature basis using one of several available computational methods including importance sampling, response surface, and Monte Carlo simulation. The approach is illustrated for risk prediction of a representative gas turbine engine disk. The results can be used to gain a better understanding of the AC and how the problem is solved using the probabilistic damage tolerance framework provided in DARWIN.

Embedded Thin-Film Sensor for Crack Detection and Monitoring in Fracture Critical Turbine Engine Components

2006 ◽  
Author(s):  
S. J. Hudak ◽  
B. R. Lanning ◽  
G. M. Light ◽  
K. S. Chan ◽  
J. A. Moryl ◽  
...  
Keyword(s):  
Thin Film ◽  
Crack Detection ◽  
Health Management ◽  
Fatigue Cracks ◽  
Component Level ◽  
Damage State ◽  
Film Sensor ◽  
Turbine Engine ◽  
Thin Film Sensor ◽  
Engine Components

The development and implementation of an integrated health management system has the potential to significantly enhance the reliability and readiness of high-value assets, while concurrently decreasing sustainment costs. A key aspect of this approach is on-board sensing to provide continual feedback on the evolving damage state at the material and component level. This paper summarizes the development and status of an embedded, thin-film, wireless, sensor for detecting and monitoring material damage state (i.e., cracking) in critical turbine engine components at elevated temperature. The potential benefits of on-board detection and monitoring of defects, as compared to periodic depot inspections, were previously assessed using probabilistic simulations. These results provided target sensitivities for the development of the thin-film sensor. The status of the sensor system is summarized including its ability to generate elastic waves and detect/monitor fatigue cracks in engineering materials at temperatures to 500°F (260°C). Crack detection sensitivities with and without load application are compared, as well as those for wired versus wireless signal transmission.

Three-Dimensional Ultrasonic Crack Detection in Anisotropic Materials

1997 ◽  
Vol 9 (2) ◽  
pp. 59-79 ◽  
Author(s):  
J. Mattsson ◽  
A. J. Niklasson ◽  
A. Eriksson
Keyword(s):  
Crack Detection ◽  
Three Dimensional ◽  
Anisotropic Materials

Fibrin-specificity of a Plasminogen Activator Affects the Efficiency of Fibrinolysis and Responsiveness to Ultrasound: Comparison of Nine Plasminogen Activators In Vitro

1999 ◽  
Vol 81 (04) ◽  
pp. 605-612 ◽  
Author(s):  
Dmitry V. Sakharov ◽  
Marrie Barrett-Bergshoeff ◽  
Rob T. Hekkenberg ◽  
Dingeman C. Rijken
Keyword(s):  
Thrombolytic Therapy ◽  
Plasminogen Activator ◽  
Tissue Type ◽  
Bolus Administration ◽  
High Frequency Ultrasound ◽  
Single Chain ◽  
Response Curves ◽  
Maximal Speed ◽  
Frequency Ultrasound

SummaryIn a number of cases, thrombolytic therapy fails to re-open occluded blood vessels, possibly due to the occurrence of thrombi resistant to lysis. We investigated in vitro how the lysis of hardly lysable model thrombi depends on the choice of the plasminogen activator (PA) and is accelerated by ultrasonic irradiation. Lysis of compacted crosslinked human plasma clots was measured after addition of nine different PAs to the surrounding plasma and the effect of 3 MHz ultrasound on the speed of lysis was assessed.Fibrin-specific PAs showed bell-shaped dose-response curves of varying width and height. PAs with improved fibrin-specificity (staphylokinase, the TNK variant of tissue-type PA [tPA], and the PA from the saliva of the Desmodus rotundus bat) induced rapid lysis in concentration ranges (80-, 260-, and 3,500-fold ranges, respectively) much wider than that for tPA (a 35-fold range). However, in terms of speed of lysis, these three PAs exceeded tPA only slightly. Reteplase and single-chain urokinase were comparable to tPA, whereas two-chain urokinase, anistreplase, and streptokinase were inferior to tPA. In the case of fibrin-specific PAs, ultrasonic treatment accelerated lysis about 1.5-fold. For streptokinase no acceleration was observed. The effect of ultrasound correlated with the presence of plasminogen in the outer plasma, suggesting that it was mediated by facilitating the transport of plasminogen to the surface of the clot.In conclusion, PAs with improved fibrin-specificity induce rapid lysis of plasminogen-poor compacted plasma clots in much wider concentration ranges than tPA. This offers a possibility of using single-or double-bolus administration regimens for such PAs. However, it is not likely that administration of these PAs will directly cause a dramatic increase in the rate of re-opening of the occluded arteries since they are only moderately superior to tPA in terms of maximal speed of lysis. Application of high-frequency ultrasound as an adjunct to thrombolytic therapy may increase the treatment efficiency, particularly in conjunction with fibrin-specific PAs.

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