4. (25 points) Questions (circle your answer when necessary) When extruding a vi

Question

4. (25 points) Questions (circle your answer when necessary) When extruding a viscoelastic polymer of a square section through a die, the die opening must be a square section of the same dimensions (TRUE-FALSE) Comminution: It is defined as the breaking up of large solid particles by mechanical means TRUE-FALSE) When working with powders, higher densities are achieved (at the same compacting pressure) with smaller size particles (TRUE-FALSE) Blow molding is a typical process used to produce a plastic ball (TRUE-FALSE In the same material, hot isostatic pressing (HIP) will give a material of higher and uniform density than by compact pressing and sintering (TRUE-FALSE). Cutlery is mainly produced by hot forging (TRUE-FALSE In a sheet metal, the material propensity to earing is determined by the planar anisotropy ratio TRUE-FALSE) The more isotropic is the steel sheet, the more suitable for its use as car chassis (TRUE - FALSE) For a material with a melting point of 1085oC, the sintering temperature is In metal infiltration, gravity is the main force that draws the metal liquid of the filler into the pores (TRUE-FALSE) The "Gob" is a term applied to a slurry of copper particles for impregnation (TRUE-FALSE). The Float Process is used to produce complex shapes of glasses (TRUE-FALSE) The mechanical behavior of a viscoelastic material is determined by the rate of deformation (strain rate) (TRUE-FALSE) Anisotropic means which one of the following: (a) composite materials with composition consisting of more than two materials (b) properties are the same in every direction, (c) properties vary depending on the direction in which they are measured, or (d) strength and other properties as a function of curing temperature. In the same material, hot isostatic pressing (HIP) will give a material of higher and uniform density than by compact pressing and sintering ( TRUE-FALSE)

Explanation / Answer

A)True

When extrusion process the opening of the dye must me square in corss section

B)True

Communiation is breaking of large solids into smaller ones

C)True

When particles are small there is more number of particles are adjusted in smaller space without any spaces, so density is high for smaller ones

D)True

Blow molding technique is used for making molds of like hollow

E)True

F)True

G)True

When all properties of material are same depending on direction then the solid is said to be isotropic,when properties of material changes in direction that solids are called as anisotropic

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