Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Composite Materials

Surface Treatment of Thermal sprayed Ceramic Coatings by Laser Beam

I. K. Jasim; A. SH. Mahmood; Th. A. Hassan

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 737-743

Composite structure of magnesia partially stabilized Zirconia (MgO-PSZ) with a Ni-Al bond coat have been investigated.This composite was sprayed on to a stainless steel grid of stainless steel-304 substrate to produce coating layer. The measurements of microstructure surface roughness, porosity and microhardness for sprayed layers wereperformed. PulsedNd: glass laser with pulse duration of 300 µs. and an energy ranging between (1-7.6)jouleswas used to investigate the effect of heat treatment on the sprayed layer.The laser treatment causeda reduction in surface roughness and porosity.An improvement in the mechanical properties of the composites wasobserved.

Buckling Analysis of Composite Laminated Plate with Cutouts

Hani Aziz Ameen

Engineering and Technology Journal, 2009, Volume 27, Issue 8, Pages 1611-1621

The determination of critical buckling load of composite plate is an
important factor in determining the structural stability, which was done by ANSYS
program and experimental investigation was carried out on many specimens of
composite material of E-glass fiber reinforced polyester plastic materials with
different no. of layers. Five cases are studied to show the effect of cutout’s
parameter on the structural stability in which the shape ( circle, square, rectangle),
size (20, 30, 50 ) mm, rounding corner (5, 7.5, 10)mm and orientation of cutouts
(0°,30°,45°,60°) are presented . Also the effect of plate thickness (no. of layer) is
studied .
In general , the results of the square clamped laminated plates with circle
cutout come out in a good agreement. Which is decrease of buckling load of the
plates with change the shape from circle, square and rectangle and in case of cutout
size. The critical load is still constant with the radii rounding corner and increased
with increasing the cutout orientation and the thickness of the plate. The effect of
cutout will determine the increase or decrease of the buckling