density of composite materials calculation ~ MECHTECH GURU

# Measurement of density

Twelve numbers of samples have been prepared for measurement of density. The parameters required to measure the density parameters are diameter (d) and length (l) that have been measured three times in each of the twelve samples by digital Vernier caliper. Mean diameter (Dm) and mean length Lm of each sample are measured in order to obtain more accurate data. The volume of each sample is also calculated from mean diameter (Dm) and mean length (Lm). Composite samples are weighted by digital weighing machine and mean mass (Mm) is calculated by mass (m). Value has been taken for three times for each sample of twelve different composites. Densities (β) of each sample under individual composite have been calculated by volume (V) and mean mass (Mm) of every sample.Formulae that have been used in this present investigation are given below:

Dm = (d1+d2+d3)/3 (mm)

Lm = (l1+l2+l3)/3 (mm)

V = [л/4dm2X lm] (mm3)

Mm = [m1+m2+m3]/3 gm

Density of sample β = Mm/V gm/mm3

The green density and sintered densities have been measured by using the above formulae and discussed in this section. The theoretical density of the samples was calculated. The theoretical density (ρth) of graphite /Al composite was determined by using the following equation:

MGr =Mass fraction of the graphite

MAl= Mass fraction of aluminum

ΡGr=Density of graphite (≈ 2.07 g/cm3)

ΡAl=Density of aluminum(≈2.7 g/cm3)

## Measurement of green density

Diameter and length of each sample after compaction is calculated with the help of digital Vernier caliper. Volume of each sample are calculated and the data are given in Table 6.1. Green density of each sample is calculated with the help of mass and volume of the sample after compaction and the data are presented in Table 6.2. Compaction pressure vs green density is plotted in Figure 6.1. Figure 6.1 shows that green density increases with increasing compaction pressure.

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