1. Figure 1: Three Modes of Delamination Growth
Mode I
Mode II
Mode III
Figure 1: Three Modes of Delamination Growth

2. MMB (Mode I II) (c) DCB (Mode I) (a) ENF (Mode II) (b)P I + - II 4
MMB (Mode I
II)
(c) P
DCB (Mode I)
(a) P
ENF (Mode II)
(b)
Figure 2: (a) Double Cantilevered Beam, (b) End-Notched Flexure, and (c) Mixed Mode Bending Tests

3. Crack front
PIII
(a)
2PIII
(b)
Figure 3: (a) Split Cantilevered Beam, and (b) Modified Split Cantilevered Beam Tests

4. Figure 4: ERR Distribution in the SCB Test

5. 4 z x y T PII PI - P Crack tip End support with one side fixture
III T
PI - II
Linear
bearing
Crack tip
End support with
one side fixture
Edge delamination
PII loading roller with one side fixture
Load tab
Load
pins y x z
PII 4
Figure 5: STB Test Schematic

6. Figure 6: STB Solid Model
Test Frame
PII Actuator
Support Frame
Load Tabs
PIII Actuator
End Support
PII Loading Roller
Load Frame Clevis
Specimen
Linear Bearing
Figure 6: STB Solid Model

7. Figure 7: Photograph of STB Test Setup
MTS (P I
) actuator P
III
actuator
End support
Linear bearing
PI actuator II
Figure 7: Photograph of STB Test Setup

8. Un-delaminated Region
End Delamination
Edge Delaminations
Un-delaminated Region
B= 25.4 mm
152 mm B β
Figure 8: Specimen Schematic Showing Edge Delaminations

9. Figure 9: Effect of Edge Delamination Length on Mode III ERR Distribution

10. Pin for pin-and-clevis
Load Block
Mode I carrying screw
Pin for pin-and-clevis
Spacer Tab
Specimen
Delaminated region
Figure 10: Load Tab Design

11. Figure 11: Typical Mode III Loading Curve

12. Upper clevis to load frame actuator
Load Block
Partially Threaded Rod
Pin
Figure 12: Original Upper Clevis Design

13. Figure 13: Finite Element Model of STB Specimen

14. Figure 14: Mode I Repeated Loading Test

15. PIII All pins threaded into load tabs
Lower Clevis
Upper Clevis
Load Tab
Specimen
PIII
Linear Bearing
Spacer Tab
Radial bearing
Pins
All pins threaded into load tabs
Pin head tight against thrust bearing
Thrust bearing
Pin shank fits inside thrust bearing
Figure 15: Modified Upper Clevis Design