What is it about?
There has been an unprecedented demand in the development of fibre reinforced ceramic composite materials as thermal protection systems for atmospheric re-entry vehicles. This calls for development of reliable fastening mechanism for joining such thermal protection systems to the airframe of the vehicle. This work describes the process and methodology followed for development and characterisation of carbon fibre reinforced silicon carbide (C/SiC) fasteners for such applications.
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Why is it important?
Our findings reveal the importance of critical dimensions such as fillet radius and thread root radius of realised C/SiC bolts. This is necessary for locating stress concentration during tensile testing of C/SiC bolts. A smaller fillet radius was found to be counterproductive as it caused undesirable failure in the head-shank interface of the bolts. Our study also suggests that C/SiC fasteners are a promising alternative over Molybdenum alloy fasteners for high temperature applications.
Perspectives
It certainly was a wonderful experience writing this article with my co-authors. The effort involved in developing and characterising these C/SiC fasteners was really challenging. I hope the article would be useful for researchers working in the field of ceramic matrix composites and its joining.
Mr. Shobhit Kumar
Indian Space Research Organisation
Read the Original
This page is a summary of: Development of C/SiC Fasteners for High-Temperature Applications, Materials Performance and Characterization, April 2021, ASTM International,
DOI: 10.1520/mpc20200161.
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