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Article
Finite Element Analysis of Fire Extinguisher for Different Types of Composite Materials

Author: Raed Naeem Hwyyin
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 13 Pages: 2617-2636
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The stress and strain concentrations of a fire extinguisher made of different types of composite materials are investigated. The prediction of the failure limit and its location in the proposed design is always the associated problem that is inescapable and difficult to be solved completely in the shape design of pressure vessel. A three dimensional analysis in finite element method was made for determining theconcentration of stress and strain of the extinguisher. The xtinguisher is made of polyester resin reinforced with different types of fiber glass. The aim of the present investigation is to study the effect of different levels of internal pressure and different types of composite material on the failure limit for limiting capability of applying thatproduct in practical field.The results are compared with those obtained from the corresponding model where xy-strain of composite material reinforced with random fiber glass increases with rate (98%) while in the composite material reinforced with fiber glass arrangedwith 45o it increases with rate (99.8 %) due to increase in the internal pressure to (0.9-5) MPa. The comparison between theoretical and numerical results gives a good agreement.


Article
Three-Dimensional Analysis of Extrusion in Complex Die by Using Upper Bound Theory

Authors: Hatam Karim Kadhim --- Raed Naeem Hwyyin --- Azhar Sabah Ameed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 4 Pages: 639-650
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper depends on a new analytical method to calculate relativedeformation energies for complex die shape by using upper bound theory which isan important method to solve technical problem in the field of metaldeformation .This study divides the complex shape to a number of sectors forcounting the deformation energies and then to find the total energy requirementfor extrusion process in die with arbitrary linear function. This study uses (H)section which represents one of complex shapes to calculate the relativedeformation energies for it, taking into account the effects of friction factor ,relative die length and reduction of area .The results of the present study are compared with M.KIUCHI study and found itin a very good agreement.

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