International OPEN ACCESS Journal Of Modern Engineering Research (IJMER) | IJMER | ISSN: 2249–6645 | www.ijmer.com | Vol. 5 | Iss.4| Apr. 2015 | 8| Material Parameter and Effect of Thermal Load on Functionally Graded Cylinders Sehbaz Singh¹, Dr. Sanjeev Saini² 1 Department of Mechanical Engineering, M-Tech Scholar, DAVIET Jalandhar, India. ² Department of Mechanical Engineering, DAVIET, Jalandhar, India. I. Introduction There is a development of new class of new material known as composite material, due to improvement in performance of structural components in terms of weight reduction and high strength. Nowadays composite materials are used very widely because they have desirable properties and are suitable in different situations and served their purpose very well. They are made up of two or more constituent which are in soluble and mixed at microscopic level. These are heterogeneous materials and generally used to ingredients; a binder or matrix and reinforcement (Alman, 2001). The reinforcement is stronger and hard component where as matrix act as a binder and helps reinforcement to held in its fixed place. The matrix shields the reinforcement which may be breakable like long fibers used with plastics to make fiber glass. The composite material has high specific modulus and specific strength than that of monolithic materials. Specific modulus is the ratio of Young’s modulus to density where as specific strength is the ratio of strength to the density of material for an example, the strength of graphite-epoxy unidirectional composite material is same as that of steel but specific strength of this composite material is three time more than steel and hence reducing cost of material (Kaw, 1997). II. Functionally Graded Materials There development of new materials for components exposed to elevated temperature and high pressure due to advancement in technology. The conventional metals alone may not survive under high thermo- mechanical loading. Thus, a new concept of Functionally Graded Materials (FGM) evolved which led to the development of superior heat resistant materials. Such new development materials have capability to resist the extreme service conditions. Functionally graded material is a type of multiphase material in which the material properties change continuously along the position to meet the design requirements of the components. There also achieve the purpose of optimizing the structure (Gupta et al, 2005). Functionally graded materials are extensively used in applications such as aerospace, nuclear reactors, internal combustion engines etc. (Noda et al, 1998). The concept of FGM was first proposed by Japanese researchers in 1984-85 while they working on space plane project for advanced material in aerospace application. The body of the space craft will be undergo ABSTRACT: The present study investigates the creep in a thick-walled composite cylinders made up of aluminum/aluminum alloy matrix and reinforced with silicon carbide particles. The distribution of SiCp is assumed to be either uniform or decreasing linearly from the inner to the outer radius of the cylinder. The creep behavior of the cylinder has been described by threshold stress based creep law with a stress exponent of 5. The composite cylinders are subjected to internal pressure which is applied gradually and steady state condition of stress is assumed. The creep parameters required to be used in creep law, are extracted by conducting regression analysis on the available experimental results. The mathematical models have been developed to describe steady state creep in the composite cylinder by using von-Mises criterion. Regression analysis is used to obtain the creep parameters required in the study. The basic equilibrium equation of the cylinder and other constitutive equations have been solved to obtain creep stresses in the cylinder. The effect of varying particle size, particle content and temperature on the stresses in the composite cylinder has been analyzed. The study revealed that the stress distributions in the cylinder do not vary significantly for various combinations of particle size, particle content and operating temperature except for slight variation observed for varying particle content. Functionally Graded Materials (FGMs) emerged and led to the development of superior heat resistant materials. Keywords – FGM(Functionally graded material), Creep law, Von-Mises criterion, Creep Parameters,