Page 42 - Engineered Interfaces in Fiber Reinforced Composites

Chapter 2. Characterization of interfaces 25

2 15
Applied strain =04% 50
- 25 -

Y $ E
.- c1 OE
2
v)
+ -25 2
v)
&
0 -50
L
0 -75
0 200 400 600 800 1000
(4 Axial distance (pm)

2

50
g 25
.- 0 2
c
E'
+ 5
v) -25 2
L
ai
e -50
LL
0 -75
0 200 400 600 800 1000
(b) Axial distance (pm)

100

2 50
0
+
v) 1 -50

Applied strain =2.5% -100
0 -150
0 200 400 600 800 1000
(4 Axial distance (pm)

Fig. 2.10. Fiber strain and interfacial shear stress (IFSS) profiles along the fiber length for a heat-treated
Kevlar 49 fiber-poxy resin composite. At applied strains of (a) 0.60% (b) 1.90% and (c) 2.5%. After
Galiotis (1993a,b).