Print ISSN: 1814-6120

Online ISSN: 2311-8385

Volume 18, Issue 1

Volume 18, Issue 1, Spring 2018, Page 1-38


Investigation of Stress Intensity Factor for Corrugated Plates with Different Profiles Using Extended Finite Element (XFEM)

Basrah Journal for Engineering Science, Volume 18, Issue 1, Pages 1-9

Corrugated plates play very important role in various
engineering applications. The occurrence of crack in the body of
corrugated plate might results in catastrophic failure. In the
present paper there are different profiles of corrugated plates
(trapezoidal, sinusoidal and triangle) that are studied. In each
profile the stress intensity factor and shape factor were
calculated for various crack orientations, various corrugation
angles and different curvature radius for the same profile. They
are all subjected to different loading conditions using Extended
Finite Element Method (XFEM).
It is found the stress intensity factor when load applied parallel
to corrugation direction is higher when load applied
perpendicular to corrugation direction. Also found that the
stress intensity factor increase by 115% when curvature radius
increases with the load applied perpendicular to corrugation.
This study also found and explained that the stress intensity
factor increases slightly when the corrugation angle of the triangle
corrugated plate increases. In all cases studied, the trapezoidal
the corrugated plate shows the lower values of the stress intensity factor
compared to the sinusoidal and triangle corrugated plates.

Energy and Exergy Analysis of Dual Channel Solar Air Collector with Perforating “V” Corrugated Absorber Plate

Basrah Journal for Engineering Science, Volume 18, Issue 1, Pages 10-15

This paper, an experimental study was carried
out on a dual channel with perforating “V” corrugated absorber
the plate of solar air collector which the air flows both in upper
channel and lower channel of the absorber plate for increasing
heat transfer coefficient and improving thermal performance. The
results of experimental procedures for dual channel with
perforating “V” corrugated absorber plate of solar collector were
compared with the flat plate dual channel of the solar collector.
Experimental calculations had been performed under Baghdad
(33.34° North latitude, 44.4° East longitude) climatic conditions at
different values of mass flow rates 0.021 kg/s, 0.027 kg/s and
0.32 kg/s. The results showed that the dual channel with
perforating “V” corrugated absorber plate of solar collector is
found to perform more efficiently than the flat plate dual channel
of the solar collector with an increased 39% in thermal efficiency. Then,
it showed that efficiency increases with increasing mass flow
rates. Also, it showed that the heat removal factor of the dual
channel with perforating “V” corrugated absorber plate of solar
the collector is 36% more than the flat plate dual channel of solar
collector. At the last part of the study, the exergy relations were
derived for both collectors. The results of this part showed that the
flat plate dual channel of solar collector is having the largest
irreversibility (exergy loss) and the dual channel with perforating
“V” corrugated absorber plate of solar collector is having a
greatest exergetic efficiency.

Effects of Coupling between Lateral and Torsional Motions in Seismic Response of Buildings

Basrah Journal for Engineering Science, Volume 18, Issue 1, Pages 16-30

The goal of the present paper is to study the adequacy
of torsional provisions in the international buildings code (IBC)
for irregular building taken into account effect of the angles of
seismic attacks. The responses of the frame-shear-wall twelvestory asymmetric building under earthquake loading by using
equivalent lateral force procedure and dynamic response
spectrum analysis have been studied intensively in this present
research paper. This study performs static and dynamic
response analyses of building models under earthquake ground
motions compatible with the design response spectrum defined
in the international buildings code. The dynamic response
spectrum was scaled according to the code static base shear. The
static and dynamic base shear with different angles of seismic
attacks has been calculated. The scaling factors, angles of
seismic attacks, accidental storey torsions, storey shear,
dynamic and static base shear have been evaluated here. The
torsional moment at different storey levels for dynamic analysis
has been estimated and compared with the static values.

Steady State Thermo XFEM Fracture Analysis of Isotropic and an Isotropic FG Plate with Inclined Center Crack

Basrah Journal for Engineering Science, Volume 18, Issue 1, Pages 31-38

The extended-finite element method (X-FEM) is used
for crack analysis of orthotropic and isotropic functionally graded composite material (FGCM) plate with a slanted crack
under thermal loadings. The enrichments functions of
discontinuity are implemented. Mixed-mode SIFs are
calculated in isotropic and orthotropic FGMs. Gaussian
technique (Q4) has been applied in the numerical calculation of
interaction of solution. Thermal effects, fundamental
equations, the interaction integral of non-homogeneous cases
(M-integral), and proposal numerical integration rule is set to
simulate and to debate the accuracy of the present work results
in comparing with the results of the references available in
the literature. In addition, the effect of the size of crack is studied
to discuss the values of energy release rate and stress intensity
factors with different crack angles. The present study is
implemented by using MATLAB program to present steady-state thermo XFEM fracture analysis of isotropic and an
isotropic FG plate with inclined center crack.