International Research Journal of Engineering, IT & Scientific Research
Available online at https://sloap.org/journals/index.php/irjeis/
Vol. 5 No. 3 May 2019, pages: 28~41
ISSN: 2454-2261
https://doi.org/10.21744/irjeis.v5n3.645
28
Effect of Reversing Lamination Scheme
Osama Mohammed Elmardi Suleiman
a
Mahmoud Yassin Osman
b
Tagelsir Hassan
c
Article history: Abstract
Received: 27 December 2018
Accepted: 31 March 2019
Published: 31 May 2019
New numerical results are generated for in-plane compressive biaxial
buckling which serves to quantify the effect of reversing lamination scheme
on buckling loading. The buckling loads have been determined for two
modulus ratios 40 and 5. It is observed that the buckling loads are completely
the same for the given first three modes. Therefore, it can be concluded that
the buckling load of laminated plates will remain the same even if the
lamination order is reversed. The reason behind this is that the transformed
elastic coefficients, [
], are equal for both lamination schemes.
Keywords:
classical laminated plate theory;
composite laminated decks
plates;
finite element;
Fortran program;
reversing lamination scheme;
2454-2261
©
Copyright 2019. The Author.
This is an open-access article under the CC BY-SA license
(https://creativecommons.org/licenses/by-sa/4.0/)
All rights reserved.
Author correspondence:
Osama Mohammed Elmardi Suleiman,
Nile Valley University, (Sudan/East Africa).
Email address: osamamm64@gmail.com
1. Introduction
The effects of lamination scheme on the non – dimensional critical buckling loads of laminated composite plates
are investigated.
The material chosen has the following properties:
1
/
2
= 5, 10, 20, 25, 40 ;
12
=
13
=
23
= 0.5
2
;
12
=
0.25 .
Several numerical methods could be used in this study, but the main ones are finite difference method (FDM),
dynamic relaxation coupled with finite difference method (DR) as is shown in references (Turvey & Osman, 1990;
Turvey & Osman, 1989); Turvey & Osman, 1991; Elmardi, 2014; 2015; 2015a; 2015b; 2016), and finite element
method (FEM).
In the present work, a numerical method known as the finite element method (FEM) is used. It is a numerical
procedure for obtaining solutions to many of the problems encountered in engineering analysis. It has two primary
subdivisions. The first utilizes discrete elements to obtain the joint displacements and member forces of a structural
a
Nile Valley University, (Sudan/East Africa)
b
Kassala University, (Sudan/East Africa)
c
Omdurman Islamic University, (Sudan/East Africa)