Question

In Glass Fiber Reinforced plastic (GFRP) composites with long fibers, the role of matrix is to

(P) Support and transfer the stresses to the fibers

(Q) Reduced propagation of cracks 

(R) Carry the entire load

(S) Protect the fibers against damage

The correct statements are

1.  P, Q and R
2. Q, R and S
3. P, Q and S
4. P, R and S
5.

Answer 1

Correct Answer - Option 3 : P, Q and S

Concept:

Fiber-reinforced plastic is a composite material made of a polymer matrix reinforced with fibers. The fibers are usually glass, carbon, aramid, or basalt. Rarely, other fibers such as paper, wood, or asbestos have been used. When fiber material is glass it is called Glass fiber reinforce plastic.

In composite material, the matrix material serves the following functions:

• Holds the fibers together.
•  Protects the fibers from the environment.
• Support and transfer the stresses to the fiber
•  Distributes the loads evenly between fibers so that all fibers are subjected to the same amount of strain.
• Enhances transverse properties of a laminate.
• Improves impact and fracture resistance of a component. 
• Helps to reduce the propagation of crack growth through the fibers by providing an alternate failure path along with the interface between the fibers and the matrix.
• Carry interlaminar shear.
• Protect the fiber against damage.