Islamic Azad University Arak BranchJournal of Solid Mechanics2008-35051220090630Finite Element Analysis of Buckling of Thin Cylindrical Shell Subjected to Uniform External Pressure148158514298ENB PrabuDepartment of Mechanical Engineering, Pondicherry Engineering CollegeN RathinamDepartment of Mechanical Engineering, Pondicherry Engineering CollegeR SrinivasanDepartment of Mechanical Engineering, Pondicherry Engineering CollegeK.A.S NaarayenDepartment of Mechanical Engineering, Pondicherry Engineering CollegeJournal Article20090722One of the common failure modes of thin cylindrical shell subjected external pressure is buckling. The buckling pressure of these shell structures are dominantly affected by the geometrical imperfections present in the cylindrical shell which are very difficult to alleviate during manufacturing process. In this work, only three types of geometrical imperfection patterns are considered namely (a) eigen affine mode imperfection pattern, (b) inward half lobe axisymmetric imperfection pattern extended throughout the height of the cylindrical shell and (c) local geometrical imperfection patterns such as inward dimple with varying wave lengths located at the mid-height of the cylindrical shell. ANSYS FE non-linear buckling analysis including both material and geometrical non-linearities is used to determine the critical buckling pressure. From the analysis it is found that when the maximum amplitude of imperfections is 1<em>t</em>, the eigen affine imperfection pattern gives out the lowest critical buckling pressure when compared to the other imperfection patterns considered. When the amplitude of imperfections is above 1<em>t</em>, the inner half lobe axisymmetric imperfection pattern gives out the lowest critical buckling pressure when compared to the other imperfection patterns considered.http://jsm.iau-arak.ac.ir/article_514298_f065c919775b0d302300094c3b88c733.pdf