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Dent-to-stiffener evaluation concept for thin-walled steel cylinders

Akarsu Oğuzhan, Bayrak Bariş, Kiliç Mahmut, Maali Mahyar, Aydin Abdulkadir Cüneyt

Architecture Civil Engineering Environment

2023

Vol. 16, no. 3

43--54

Defects/imperfections can occur during manufacturing, assembly, welding, and other processes, which can reduce the critical buckling load. However, the axial buckling load is beyond the scope of this work, and there are many studies on the stiffening effect of longitudinal dents. This concept combined the idea of the dent-to-stiffener evaluation concept for thin-walled steel cylinders. This study aims to transform the dents into artificial dents for a stiffening effect on the buckling phenomena. For this purpose, 37 thin-walled steel cylinder models, including the perfect model, were designed for varying dent shapes, dent widths, dent depths, dent lengths, and dent angles. The study also contributed to the effect of dent parameters on the critical buckling load of thin-walled steel cylinders. In particular, increasing the initial buckling will motivate the industry to convert dents into stiffeners with small artificial touches to enhance the longevity of the structure. The results showed that the introduction of certain artificial dents can significantly increase the critical buckling load of cylinders, thus improving their resistance against buckling, which has significant implications for various industries that use thin-walled steel cylinders in their structures. The proposed simulations for transforming dents into artificial stiffeners can be a valuable tool for enhancing the longevity and safety of thin-walled steel cylinders and other structures.

Dynamical analysis of stiffened plates under patch loading

Srivastava A. K. L., Pandey S. R., Kumar A.

International Journal of Applied Mechanics and Engineering

2013

Vol. 18, no. 2

537--553

The vibration characteristics of stiffened plates with cutouts subjected to in-plane partial edge loadings at one end at the plate boundaries are studied using the finite element method. Buckling loads and vibration frequencies are determined for different cutout ratios and extent of partial edge loading at one end. In the structural modelling, the plate and the stiffeners are treated as separate elements where the compatibility between these two types of elements is maintained. The main elegance of the formulation lies in the treatment of the stiffeners. The stiffeners can be placed anywhere within the plate element, and need not be placed on the nodal lines. The vibration characteristics are discussed and the results are compared with those available in the literature. Numerical results are presented for a range of cutout to plate size from 0 to 0.8.

Application of different dynamic stability criteria in case of columns with intermediate stiffeners

Teter A.

Mechanics and Mechanical Engineering

2010

Vol. 14, nr 2

339-349

In this paper, the dynamic responses of the open cross section columns with intermediate stiffeners subjected to in-plane pulse loading of a rectangular shape were concerned. Columns made of isotropic material were assumed to be simply supported at both loaded ends. The problem of the interactive buckling was solved by finite element method (FEM) - ANSYS 9. The critical dynamite load factors DLF has been determined using the most popular Budiansky-Hutchinson's criterion and they have been verified with author's versions of the phase portraits criterion.