Evaluation of Metal–Ceramic Composite Joint Under Tensile Loads at Elevated Temperature

An experimental study was undertaken to understand the tensile behavior of metal–ceramic composite joint with bolted configuration. Nickel based super alloy (GTM-Su-263) and SiC f /SiC composite were the material systems with an aerospace grade MJ6 bolt of GTM-Su-718. This bolted assembly was pulled...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2017-04, Vol.70 (3), p.769-774
Main Authors: Petley, Vijay, Verma, Shweta, Saravanan, K., Stalin, M., Raghavendra, K., Venkateswarlu, K.
Format: Article
Language:English
Subjects:
Aerospace engineering
Bearing strength
Bolted joints
Ceramic fiber reinforced ceramics
Cermets
Chemistry and Materials Science
Corrosion and Coatings
Fiber pullout
High temperature
Materials Science
Metallic Materials
Nickel base alloys
Oxidation
Silicon carbide
Superalloys
Technical Paper
Temperature
Tensile strength
Tensile stress
Tribology
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Summary:An experimental study was undertaken to understand the tensile behavior of metal–ceramic composite joint with bolted configuration. Nickel based super alloy (GTM-Su-263) and SiC f /SiC composite were the material systems with an aerospace grade MJ6 bolt of GTM-Su-718. This bolted assembly was pulled at temperatures 25, 600 and 750 °C which were likely to be experienced in a typical aero engine. In case of metal–ceramic composite joint, the net tensile stress decreased from 110 to 88 MPa with increase in temperature from 25 to 600 °C. Similarly, the bearing stress reduced from 146 to 118 MPa. In all the metal–ceramic composite joints, the fracture initiated at the hole edge experienced the maximum tensile stresses. With further increase in temperature, reduction in the net tensile and bearing strength was significant and was attributed to the oxidation of the interface between the fiber and matrix. SEM studies clearly suggested that debonding and fiber pullout resulted in inferior tensile strength properties at elevated temperatures.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-017-1063-4