Optimization of Drilling Parameters in Sisal-Human Hair Hybrid Composite Using Grey Relational Analysis

Figure 4

SEM image of (a) 60% epoxy and 40% fiber after tensile fracture; (b) 90% epoxy and 10% fiber-presence of void; (c) 90% epoxy and 10% fiber-fiber pull out; and (d) 90% epoxy and 10% matrix breakage.

(a)

(b)

(c)

(d)