The internal pores would give some error while calculating from Archimedes principle. Only the open pores would be infiltrated by liquid not the internal closed pored .

Dear, Muhammad Waqas Khalid

I guess the machine might be setup with standard density values of alumina and SiC, whereas in real case it can vary from 3.4 to 3.7 g/cc. Machine results may be approximate..

Have you tried with "Rule of Mixture" to find density of any composite?

According to this rule, the quantity of matrix and reinforcements in a composite can be found either by weight fraction (w) or by volume fraction (v)

ρc = ρm νm + ρr νr

Where, ρc, ρm and ρr - respective densities of the composite, matrix and reinforcements.

νm and νr - Respective Volume fractions of matrix and reinforcements.

Hope it will help..

-MK

The internal pores would give some error while calculating from Archimedes principle. Only the open pores would be infiltrated by liquid not the internal closed pored .

I agree with Mr.MK fully.

A.V.Sethuraman

Measurement of weight/mass is generally indisputable with preponderance of high precision weight measuring devices. The parameter causing the changes in density from Calculation using Archimedes and Machine is the volume of the composite. Calculating volume using Archimedes seems to be more exact (taking note of surface/peripheral imperfection and especially for irregularly shaped profiles) and thus the displaced liquid volume gives the near precise volume of the composite (though you cannot ignore imperfection of the internal porosity as explained by Mr Abhishek). The volume therefore seems to be less (thus higher density value) when using Archimedes as compared to using machine or calculating the volume (volume higher with inclusion of surface and internal imperfections and thus density seems lower).

I agree with the answers of Abhishek and Bashar

Regards,

Sridhar Lanka.

Archimedes principle doesn't work especially in case of density measurement of cast composites due to presence of porosity. For this purpose a procedure combining the microscopic and water displacement methods has been successfully tried as it is reported sometime in 1982-84.

Dr. Ghosh,

Could you kindly emphasize more about the combination of microscopic and water displacement procedures or provide me with supportive information links for the material. Archimedes principle also uses the concept of water displacement, then what is the necessity of using both microscopic and water displacement combination for measurement of density of a cast composite.

Regards,

Sridhar Lanka.

Dear Muhammad Waqas Khalid, If measure the actual density of composite specimen using Archimedes Principle, the rise level of water should be more accurate so that you can get accurate results. For that, u can repeat the experiment for 6 times and take the average value which may close to the density measured by standard equipment.

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