Page 192 - 3D Fibre Reinforced Polymer Composites

Stitched Composites 181

6oo r

-

100 - Unnotched CFRP stitched with glass
n Notched CFRP stitched with glass
'
0L.J - '..***.I ' .*.L*.d *.--..-' .*-
ioo io' id id lo4 lo5 io6
Number of Compression Load Cycles

Figure 8.13 A comparison of measured fatigue data points against theoretical S-N
curves for two types of stitched carbotdepoxy composites fatigued under compression-
compression loading (Data for the upper and lower data points are from Vandermey et
al. (1991) and Portanova et al. (1992), respectively).

- 250

d
E 200

150
-..
..
100 - 0 No Stitchina -..
m Light Stitching (3 km')
50 - - Heavy Stitching (6 km') ' -
' ' .'**d yWCYI ' ' .,.d ' ' a *.***' ' ' ' '
*
0 '--a'1 a
IO-' 10" 10' 1d io3 10' io5 10" io'
Number of Tension Load Cycles

Figure 8.14 S-N curves for an unstitched and two stitched glasshinyl ester composites
fatigued under zero-to-tension loading (Data from Shah Khan and Mouritz, 1996).