Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Buckling

Parametric Study on Buckling Behavior of Aluminum Alloy Thin-Walled Lipped Channel Beam with Perforations Subjected to Combined Loading

Dalya S. Khazaal; Hussein M. AL-Khafaji; Imad A. Abdulsahib

Engineering and Technology Journal, 2021, Volume 39, Issue 1A, Pages 89-103
DOI: 10.30684/etj.v39i1A.1710

The objective of the research presented in this paper is to investigate the buckling behavior of a perforated thin-walled lipped channel beam subjected to combined load. A nonlinear finite element method was used to analyze the buckling behavior of the beam. Experimental tests were made to validate the finite element simulation. Three factors with three levels for each factor were chosen to examine their influence on the buckling behavior of the beam and these factors are: the shape of holes, opening ratio and the spacing ratio of . The finite elements outcome was analyzed by using Taguchi method to identify the best set of three-parameter combinations for optimum critical buckling load. The analysis of variance technique (ANOVA) was implemented to determine the contribution of each parameter on buckling strength. Results showed that the mode of buckling failure of the perforated beam is lateral-torsional buckling and the hexagonal hole shape, =1.7 and = 1.3 were the best combination of parameters that gives the best buckling strength. The results also showed that the shape of holes is the most influential on buckling behavior of the perforated beam for this case of loading.

Dynamic Buckling Behavior for 304 Stainless Steel Columns Using Electrical LASER Alarm System

Hussain Jasim Al-Alkawi; Ekbal Hussain Ali; Firas Ali Jasim Al-Mahaweeli

Engineering and Technology Journal, 2016, Volume 34, Issue 11, Pages 2036-2046

The paper summarized some experimental main results of dynamic buckling under increasing compression load. The buckling behavior of 304 stainless steel was investigated using Euler and Johnson formulas, which is the most commonly used in industrial applications. It has been verified that metallic materials can exhibit non-linear buckling behavior with mechanical properties dependency. This behavior yield a non-linear model which based on Hong’s model but using the mechanical properties with cycles to failure. It was observed that the proposed model gave safe predictions while the Hong’s model yields non satisfactory predictions of critical buckling loads and also design electrical LASER alarm system to avoid the failure occurs in the specimen when access to critical buckling load.

Studying the Tensile and Buckling for PMMA Reinforced by Jute Fibers for Prosthetic Pylon

Jawad Kadhim Oleiwi; Shaymaa Jumaah Ahmed

Engineering and Technology Journal, 2016, Volume 34, Issue 1, Pages 111-122

The main objective of this research is studying the tensile and buckling of Jute fibers reinforced composite by varying the number of Jute fibers layers and fibers angle (±45°&0°/90°). Vacuum bagging technique was adopted for the preparation of laminated composite specimens that made from PMMA as matrix and Perlon layers with different number of Jute fibers layers as reinforcement materials. Also the finite element method (ANSYS-15) was used by creating a model of prosthetic pylon and applied compressive load at heel strike step from gait cycle to know the critical buckling stress. The results showed that the best laminated composite specimens have three Jute fibers layers at (0 º /90 º) fibers orientation relative to applied load. Where, the critical buckling stress, tensile strength, and modulus of elasticity were (442MPa, 61MPa, and 3.75GPa) respectively, while, the percentage elongation was (2.1).

Effect of Post-Buckling on The Stiffness and Stress of Plate

Hani Aziz Ameen; Kayser Aziz Ameen; Ibtissam Mahdi shihab

Engineering and Technology Journal, 2015, Volume 33, Issue 2, Pages 415-430

This paper presents a theoretical investigation of post and pre-buckling of the simply supported plate. The effect of post and pre buckling on the stiffness of plate is determined. The full derivation of the equation described the ratio of stiffness of plate in the post to pre buckling is derived and from this equation it can be deduced that the simply support plates lose about (3/5) of their initial compressional stiffness after buckling also it can be concluded that after buckling the maximum stress increases at almost four times the pre-buckling.

Studying a Buckling Behavior for Edge Cracked Plates Under Compression

Nathera Abdual Hassan Saleh; Saddam Kallsan Kuess

Engineering and Technology Journal, 2012, Volume 30, Issue 1, Pages 24-42

In this work, the buckling behavior for edge cracked plates under
compression loading is studied considering the influence of the crack parameters
(i.e. size, location and orientation), plate aspect ratio and plate boundary
conditions. The problem was solved numerically using finite element method
utilizing ANSYS software version11 .The obtained results show that the crack
parameters as well as plate aspect ratio and plate boundary conditions are
efficient factors on the buckling coefficient and corresponding nodal patterns of
such plates. The useful numerical results for buckling coefficients and
corresponding nodal patterns are displayed in figures. According to the author's
knowledge about the published literature on the buckling field, there is no
specific report on the nodal patterns results of such edge cracked plates.

Tensile and Buckling Analysis of the Polymer Composite Beam Reinforced by Natural Jute Fiber

Mohamad Ali Tariq; Qahtan Adnan Hamad; Mohamad K. Alwan

Engineering and Technology Journal, 2011, Volume 29, Issue 1, Pages 129-140

This research focuses on the preparation of polymer matrix composite
material by (hand lay – UP) method, where the material was prepared from
unsaturated polyester resin (up) as a matrix reinforced by natural jute fiber with
different volume fractions (3%, 4%, 5%, 6%).The experimental work and finite
element techniques were used to analysis the tensile and the buckling analysis of
the composite beam reinforced by natural jute fiber at different volume fraction.
The results of experimental work of the modulus of elasticity were in the
range of the theoretical results. The critical load increased with increase the fiber
volume fraction that ( cr P =610N) at ( f V = 3%) and ( cr P =830N) at ( f V =6 %) for
the experimental results.While ( cr P =619N) at ( f V = 3%) and ( cr P =877N) at
( f V =6 %) for the finite element results.