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Dr. Mohammed Rahif Hakmi
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Chairman of Armada Group, Chairman of the Board of Honour of Karameh Football Club
Chairman of Armada Group, Chairman of the Board of Honour of Karameh Football Club

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Mohammed Rahif Hakmi
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Armada Group website

http://armadaholding.com/

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Mohammed Rahif Hakmi Published Research

Postbuckling behaviour of foam-filled, thin-walled steel beams

ARTICLE in JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 20(1):75-83 · DECEMBER 1991 
Department of Civil Engineering, University of Salford, Salford M5 4WT, UK

J.Michael Davies

Mohammed Rahif Hakmi
Armada Group

ABSTRACT

Sandwich construction is increasingly used as wall and roof cladding for building structures. Typically, a cladding panel may consist of two plane or profiled metal faces with a foamed plastic core. The core may be polyurethane, polyisocyanurate, polystyrene or phenolic resin. When such a panel is subject to static loading due, for instance, to wind, snow or temperature gradient, one face is compressed and becomes liable to local buckling. If this face has a trapezoidal or similar profile the failure mode is similar to that for profiled steel sheeting, though the failure stress is enhanced by the presence of the core. The compressed face element first forms a series of buckling waves which increase in amplitude in the postbuckling phase. Failure takes place when one buckle in the region of maximum bending moment cripples.In light gauge steel applications, the conventional design treatment for this phenomenon utilises the concept of effective width. In order to investigate the extension of the effective width concept to plate elements supported by plastic foam material, a series of tests were undertaken on foam-filled steel beams. This paper describes these tests and their interpretation in terms of an enhanced effective width formula.

https://www.researchgate.net/publication/222343116_Postbuckling_behaviour_of_foam-filled_thin-walled_steel_beams

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Fire Resistant Sandwich Panels for Offshore Structures-The cost effective use of fibre reinforced composites offshore

The results of a major research programme into the cost effective use of fibre reinforced composites offshore, undertaken as a Joint Industry Project by a consortium of universities and contractors are presented in this report.
The report includes a detailed (54 page) summary of current offshore composite applications, followed by a review of the 43 projects conducted during the programme which spanned 13 years and four phases of research and considered the following performance issues – fire, blast/impact, environmental durability, elevated temperatures, jointing, long term behaviour, non-destructive inspection and structural design. These are related to the use of pipes, panels, secondary structures
e.g. gratings, walkways etc. and top-side structures.
The report is intended for use as an information source for engineers involved in the use of composites offshore. The most significant advances have been in the areas of pipework and fluid handling, driven by their light weight and corrosion resistance compared to metals.

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Local Buckling of Profiled Sandwich Plates IABSE Symposium Brussels 1990
Sandwich construction is increasingly used as wall and roof cladding for building structures. Typically, a cladding panel may consist of two plane or profiled metal faces with a foamed plastic core. The core may be polyurethane, polyisocyanurate, polystyrene or phenolic resin. When such a panel is subject to static loading due, for instance, to wind, snow or temperature gradient, one face is compressed and becomes liable to local buckling. 

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A man is walking around with bank notes on him. (video translated in French)
And guess who's gonna be the most... Human of all the people that he's going to meet...

https://www.facebook.com/minutebuzz/videos/10153768483284284/?fref=nf

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Armada from the Helicopter

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