Question 1. If a fiber weight 3.0 g and composite specimen weighing 4.g. The composite specimen weighs 2.0 g in water. If the specific gravity of the fiber and matrix is 2.4 and 1.3, respectively, find the 1. Theoretical density of composite 2. Experimental density 3. Void fraction

Explanation:

From the given information:

weight of fiber = 3.0 g

weight of composite specimen = 4.0 g

specimen composite weight in water = 2.0 g

specific gravity of fiber = 2.4

specific gravity of matrix = 1.3

The weight of the matrix = weight of the composite - the weight of fiber

⇒ (4.0 - 3.0) g

= 1.0 g

The theoretical density of the composite can be determined by using the formula:

The experimental density is determined  by using the equation:

The void fraction is:

= 0.1818

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