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

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 the concentration 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 that product 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 arranged with 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

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

This paper depends on a new analytical method to calculate relative deformation energies for complex die shape by using upper bound theory which is an important method to solve technical problem in the field of metal deformation .This study divides the complex shape to a number of sectors for counting the deformation energies and then to find the total energy requirement for extrusion process in die with arbitrary linear function. This study uses (H) section which represents one of complex shapes to calculate the relative deformation 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 it in a very good agreement

A Study on the Effects of Salt Concentration Environment on theMechanical Properties of Polyester and Composite Materials

The study investigates the effects of salt concentration on some mechanical properties of thermoset polyester resin without reinforce and polyester resin reinforced with random fiber glass mat. The volume fraction of the composite material varies in (15%, 25%, 35% and 45%). The two types of material were immersed for (40) days in different salt concentrations ratio (15%, 35% and 55%). The environment consists of salt 99.9% and 0.008% magnesium carbonate and potassium iodide. The study depends on the experimental results of impact test and tensile test to describe the mechanical properties of polyester resin and composite material. It is found that the fracture toughness of composite material increases at approximate ratio of (2.9%) while the polyester resin increases at approximate of (2.25%) due to increasing the salt concentration in water with ratio (40%), so that the fracture toughness increases with approximate ratio (3%) due to increase in the volume fraction ratio from (15%) to (45%). The elastic modulus of composite material increases with ratio of (14.9%) and (90.29%) for polyester due to increase in the salt concentration ratio in the water at approximate ratio of (40%). The elastic modulus increases at ratio of (13.73%) , the yield stress of polyester increase at ratio (50.32%) and yield stress of composite material increases at ratio (55%) as a results of increase in the volume fraction ratio from (15%) to (45%)