Volume 2 Issue 7



Abstract : In applications such as pressure vessel for industr ial gases or a media transportation of high- pressurized fluids and piping of nuclear reactors,the cylinder has to operate under severe mechanical and thermal loads,causing significant c reep hence reduced service life (Gupta and Phatak,2001;Tachibana and Iyoku,2004;Hagihara a nd Miyazaki,2008). As an example,in the high temperature engineering test reactor,the temp erature reaches of the order of 900 oC (Tachibana and Iyoku,2004). The piping of reactor cooling system are subjected to high temperature and pressure and may be damaged due to high heat generated from the reactor core (Hagihara and Miyazaki,2008). A number of studies pertaining to creep behaviour of the cylinder assume the cylinder to be made of monolith ic material. However,under severe thermo mechanical loads cylinder made of monolithic materi als may not perform well. The weight reduction achieved in engineering components,resul ting from the use of aluminum/aluminum base alloys,is expected to save power and fuel due to a reduction in the payload of dynamic systems. However,the enhanced creep of aluminum an d its alloys may be a big hindrance in such applications. Aluminum matrix composites offer a unique combination of properties,unlike many monolithic materials like metals and alloys,w hich can be tailored by modifying the content of reinforcement. Experimental studies on c reep under uniaxial loading have demonstrated that steady state creep rate is reduce d by several orders of magnitude in aluminum or its alloys reinforced with ceramic particles/whi skers like silicon carbide as compared to pure aluminum or its alloys (Nieh,1984;Nieh et al,1988). A significant improvement in specific strength and stiffness may also be attained in comp osites based on aluminum and aluminum alloys containing silicon carbide particles or whis kers. In addition,a suitable choice of variables such as reinforcement geometry,size and content of reinforcement in these composites can be used to make the cost-effective components with imp roved performance. With these forethoughts,it is decided to investigate the stea dy state creep in a cylinder made of Al-SiCp composite and subjected to high pressure and high t emperature. A mathematical model has been developed to describe the steady state creep behavi our of the composite cylinder. The developed model is used to investigate the effect of material parameters viz particle size and particle content,and operating temperature on the steady st ate creep response of the composite cylinder.

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Modified Date : 2015-07-20

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Prof. Vyankatesh S. Kulkarni , "ESTIMATION OF CREEP PARAMETERS IN AN ISOTROPIC UNIFORM COMPOSITE CYLINDER", IJIERT - International Journal of Innovations in Engineering Research and Technology, Volume 2 Issue 7, ISSN : 2394-3696, Page No.