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There are a total of 23 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Review of acousto-ultrasonic NDE for composites
Author(s): Vary, Alex; Kautz, Harold
Abstract: Acousto-ultrasonics utilizes simulated stress waves to detect and quantify defect states, damage conditions, and variations of mechanical properties in fiber reinforced composites. The term acousto-ultrasonics denotes a ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2008-05-31
Accession Number: 91N18192; Document ID: 19910008879
Acousto-ultrasonic nondestructive evaluation of materials using laser beam generation and detection
Author(s): Huber, Robert D.; Green, Robert E., Jr.; Vary, Alex; Kautz, Harold
Abstract: Presented in viewgraph format, the possibility of using laser generation and detection of ultrasound to replace piezoelectric transducers for the acousto-ultrasonic technique is advanced. The advantages and disadvantages of ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2008-05-31
Accession Number: 91N18193; Document ID: 19910008880
Application of scanning acoustic microscopy to advanced structural ceramics
Author(s): Vary, Alex; Klima, Stanley J.
Abstract: A review is presentod of research investigations of several acoustic microscopy techniques for application to structural ceramics for advanced heat engines. Results obtained with scanning acoustic microscopy (SAM), scanning ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N23987; Document ID: 19870014554; Report Number: E-3632, NAS 1.15:89929, NASA-TM-89929
Ultrasonic NDE of structural ceramics for power and propulsion systems
Author(s): Vary, Alex; Generazio, Edward R.; Roth, Don J.; Baaklini, George Y.
Abstract: A review of research investigations of several ultrasonic evaluation techniques applicable to structural ceramics for advanced heat engines is presented. This review highlights recent work conducted under the sponsorship of ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N26362; Document ID: 19870016929; Report Number: E-3705, NAS 1.15:100147, NASA-TM-100147
Tensile strain measurements of ceramic fibers using scanning laser acoustic microscopy
Author(s): Kent, Renee M.; Vary, Alex
Abstract: A noncontacting technique using scanning laser acoustic microscopy for making in situ tensile strain measurements of small diameter fibers was implemented for the tensile strain analysis of individual Nicalon SiC fibers ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-10-10
Accession Number: 92N24986; Document ID: 19920015743; Report Number: E-6919, NAS 1.15:105589, NASA-TM-105589
Quality Evaluation By Acousto-Ultrasonic Testing Of Composites
Author(s): Vary, Alex
Abstract: Promising nondestructive-testing method based on ultrasonic simulation of stress waves. Report reviews acousto-ultrasonic technology for nondestructive testing. Discusses principles, suggests advanced signal-analysis schemes ...
NASA Center: Glenn Research Center
Publication Year: 1989
Added to NTRS: 2005-09-30
Accession Number: 89B10314; Document ID: 19890000314; Report Number: LEW-14709
NDE standards for high temperature materials
Author(s): Vary, Alex
Abstract: High temperature materials include monolithic ceramics for automotive gas turbine engines and also metallic/intermetallic and ceramic matrix composites for a range of aerospace applications. These are materials that can ...
NASA Center: Glenn Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N19464; Document ID: 19910010151; Report Number: E-6023, NAS 1.15:103761, NASA-TM-103761
Fuzzy sets predict flexural strength and density of silicon nitride ceramics
Author(s): Cios, Krzysztof J.; Sztandera, Leszek M.; Baaklini, George Y.; Vary, Alex
Abstract: In this work, we utilize fuzzy sets theory to evaluate and make predictions of flexural strength and density of NASA 6Y silicon nitride ceramic. Processing variables of milling time, sintering time, and sintering nitrogen ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N27270; Document ID: 19930018081; Report Number: E-7794, NAS 1.15:106049, NASA-TM-106049
Soft computing in design and manufacturing of advanced materials
Author(s): Cios, Krzysztof J.; Baaklini, George Y; Vary, Alex
Abstract: The potential of fuzzy sets and neural networks, often referred to as soft computing, for aiding in all aspects of manufacturing of advanced materials like ceramics is addressed. In design and manufacturing of advanced ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N28624; Document ID: 19930019435; Report Number: E-7597, NAS 1.15:106032, NASA-TM-106032
Radial basis function network learns ceramic processing and predicts related strength and density
Author(s): Cios, Krzysztof J.; Baaklini, George Y.; Vary, Alex; Tjia, Robert E.
Abstract: Radial basis function (RBF) neural networks were trained using the data from 273 Si3N4 modulus of rupture (MOR) bars which were tested at room temperature and 135 MOR bars which were tested at 1370 C. Milling time, sintering ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N27129; Document ID: 19930017940; Report Number: E-7795, NAS 1.15:106048, NASA-TM-106048
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