Department of Physics, Faculty of Sciences, University of Douala, Douala, Cameroon;
Douala Institute of Technology, Douala, Cameroon;
Laboratory of Material Sciences, Department of Physics, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon;
Department of Mine, Mineral Processing and Environment, School of Geology and Mining Engineering, University of Ngaoundéré, Meiganga, Cameroon;
Functionally; Graded; Materials; Radial; Stresses; Tangential; Stresses; Cylinder; Wall;