Abstract
We explore the possibility of determining cohesive laws by the J-integral approach for materials
having non-linear stress-strain behaviour (e.g. polymers and composites) by the use of a DCB
sandwich specimen, consisting of stiff elastic beams bonded to the non-linear test material, loaded
with pure bending moments. For a wide range of parameters of the non-linear material, the plastic
unloading during crack extension is small, resulting in J integral values (fracture resistance) that
deviate maximum 15% from the work of the cohesive traction. Thus the method can be used to extract
the cohesive laws directly from experiments without any presumption about their shape. Finally, the
DCB sandwich specimen was also analysed using the I integral to quantify the overestimation of the
steady-state fracture resistance obtained using the J integral based method.
Original language | English |
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Title of host publication | Proceedings of the 20th International Conference on Composite Materials |
Number of pages | 9 |
Publisher | ICCM20 Secretariat |
Publication date | 2015 |
Publication status | Published - 2015 |
Event | 20th International Conference on Composite Materials - Copenhagen, Denmark Duration: 19 Jul 2015 → 24 Jul 2015 Conference number: 20 http://iccm20.org/ |
Conference
Conference | 20th International Conference on Composite Materials |
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Number | 20 |
Country/Territory | Denmark |
City | Copenhagen |
Period | 19/07/2015 → 24/07/2015 |
Internet address |
Keywords
- Fracture mechanics testing
- Delamination
- J integral
- Non-linear stress-strain