Effect of Proof Testing on the Failure Probability of Multiaxially Loaded Ceramic Components

2009 ◽  
pp. 346-346-14 ◽  
Author(s):  
A Brückner-Foit ◽  
A Heger ◽  
D Munz
Keyword(s):  
Failure Probability ◽  
Proof Testing ◽  
Ceramic Components

Assessment of Notches in Ceramic Components

1995 ◽  
Vol 117 (3) ◽  
pp. 413-416 ◽  
Author(s):  
A. Bru¨ckner-Foit ◽  
A. Heger ◽  
D. Munz
Keyword(s):  
Stress Concentration ◽  
Failure Probability ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Notch Root ◽  
Stress Gradient ◽  
Ceramic Components ◽  
Weibull Theory

The failure probability of notched tensile bars is calculated using the multi-axial Weibull theory. The influence exerted by the stress concentration factor, the stress gradient in the notch root, and the Weibull exponent is analyzed.

Failure Probability at the Predicted Minimum Lifetime After Proof Testing

1978 ◽  
Vol 61 (5-6) ◽  
pp. 213-216 ◽  
Author(s):  
J. E. RITTER ◽  
D. C. COYNE ◽  
KARL JAKUS
Keyword(s):  
Failure Probability ◽  
Proof Testing

scholarly journals Ceramic Applications in Turbine Engines (CATE) Development Testing

1983 ◽  
Author(s):  
H. E. Helms ◽  
S. R. Thrasher
Keyword(s):  
Gas Turbine ◽  
Process Development ◽  
Gas Turbine Engine ◽  
Turbine Engines ◽  
Development Work ◽  
Gas Turbine Engines ◽  
Turbine Engine ◽  
Proof Testing ◽  
Component Development ◽  
Ceramic Components

The objective of the CATE program was to apply ceramic components to the hot flow path of an existing vehicular gas turbine engine and thereby demonstrate the feasibility of structural ceramic components. To accomplish this the Allison IGT 404-4 gas turbine engine has operated at successively higher temperatures made possible by the introduction of ceramic components with performance and component durability demonstrations. Extensive ceramic material characterization, supplier process development work, development of non-destructive inspection (NDI) techniques, rig ceramic component development and proof testing, and engine demonstration testing have been conducted. This paper describes the CATE Project concept for development testing of ceramic components for use in vehicular gas turbine engines. Included will be the approach to development testing, a description of the CATE GT 404 engine and the ceramic components designed for that engine, a summary of the development test experience accumulated on the ceramic components, an assessment of the results and benefits gained from the program, and recommendations for follow-on component development work.

scholarly journals Initial Development of the AGT 100 Advanced Gas Turbine

1984 ◽  
Author(s):  
Richard A. Johnson
Keyword(s):  
Gas Turbine ◽  
First Year ◽  
Critical Test ◽  
Initial Development ◽  
Turbine Engine ◽  
System A ◽  
Design Changes ◽  
Electronic Control System ◽  
Proof Testing ◽  
Ceramic Components

The first year of development of an advanced unique gas turbine engine has been completed. Mechanical shakedown, through 100% speed, was accomplished with minimum failure damage to hardware. Design changes corrected problems encountered. Significant numbers of ceramic components were engine tested. The value of a flexible electronic control system, a parallel regenerator rig program, and ceramic component proof testing has been demonstrated. Critical test measurements, available computer models, and the totality of the engine environment were shown to be vital ingredients of the development process.

scholarly journals Proof testin of ceramic components. (1st report. Fast fracture strength after proof testing).

1987 ◽  
Vol 53 (492) ◽  
pp. 1638-1643 ◽  
Author(s):  
Jyunichi HAMANAKA ◽  
Yoshitaka NAKAMURA ◽  
Seijiro HAYASHI ◽  
Keiichi SAKAI ◽  
Fumio TAKEMASA
Keyword(s):  
Fracture Strength ◽  
Proof Testing ◽  
Ceramic Components ◽  
Fast Fracture

Testing of a Low Cooled Ceramic Nozzle Vane Under Transient Conditions

1998 ◽  
Author(s):  
M. Dilzer ◽  
Ch. Gutmann ◽  
A. Schulz ◽  
S. Wittig
Keyword(s):  
Finite Element ◽  
Failure Probability ◽  
Operating Conditions ◽  
Finite Element Analyses ◽  
Insulating Layer ◽  
Ceramic Structure ◽  
Thermally Induced ◽  
Nozzle Vane ◽  
Ceramic Components ◽  
Sintered Silicon

At the Institut für Thermische Strömungsrnaschinen, University of Karlsruhe (ITS) a design technology has been introduced to reduce the mechanically and especially the thermally induced stresses in ceramic components. The concept is based on a three-layered construction (outer ceramic shell - heat insulating layer - metallic core) and an optimization of the thicknesses of the single layers, in order to obtain a homogenous temperature distribution in the ceramic structure. The optimization is performed by finite element analyses in combination with failure probability calculations. This methodology has been applied to increase the reliability of a first stage Sintered Silicon Carbide (SSiC) ceramic nozzle vane of a stationary gas turbine (70MW/1400°C). As a result it was found that the mechanically and thermally induced loads have been reduced considerably and do not exceed 100MPa, thus achieving adequate life based upon failure probability calculations. Even in a trip situation (fuel cutoff), when the highest loads do occur, the calculations demonstrate a significantly reduced failure probability. The results of the finite element analyses were verified by simulating the typical operating conditions after fuel cutoff in a test rig.

Volumetric X-Ray Imaging for Ceramic Microturbine Rotors

2002 ◽  
Author(s):  
W. A. Ellingson ◽  
E. R. Koehl ◽  
J. Stainbrook ◽  
M. Rivers
Keyword(s):  
Cross Sections ◽  
High Speed ◽  
Production Costs ◽  
Imaging Method ◽  
Scale Production ◽  
Full Size ◽  
X Ray ◽  
X Ray Imaging ◽  
Proof Testing ◽  
Ceramic Components

Use of ceramic components in the hot section of gas-fired microturbines would allow higher operating temperatures and thus better operating efficiencies. However, the cost of such ceramic components is an issue for commercial-scale production. Costs can be reduced, in part, through improving fabrication yields. Use of nondestructive evaluation (NDE) methods in early stages of fabrication will support the development process to improve yields and subsequently reduce costs by rejecting flawed components prior to final processing and proof testing. An NDE approach using high-speed 3D X-ray tomographic imaging has been investigated. A large (40 × 40 cm), flat-panel, amorphous silicon X-ray detector, together with fast image processing, has been shown to allow full-volume X-ray imaging with detection of internal features in full-size as-cast parts. Gelcast radial-flow microturbine rotors, ≈23 cm in diameter, have been studied for internal defects with this 3D X-ray imaging method. Internal cracks, voids, and other variations in density within the rotors have been detected. Data acquisition speeds of 3 full frames per second have been achieved with reconstruction times of individual cross-sections of less than 1 second. This paper presents details of the 3D X-ray imaging method and results achieved on full-size microturbine rotors.

scholarly journals Proof testing of ceramic components. 2nd report. Fatigue fracture strength after proof testing.

1990 ◽  
Vol 56 (523) ◽  
pp. 462-468 ◽  
Author(s):  
Jyunichi HAMANAKA ◽  
Hiroyasu EZUMI ◽  
Akihiko SUZUKI ◽  
Shigekatu SUGIYAMA
Keyword(s):  
Fatigue Fracture ◽  
Fracture Strength ◽  
Proof Testing ◽  
Ceramic Components
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