Dynamic delamination crack propagation in unidirectional fiber composite
Book
·
OSTI ID:237743
- Purdue Univ., West Lafayette, IN (United States). School of Aeronautics and Astronautics
A newly designed DCB specimen was introduced for the study of Mode 1 delamination fracture toughness of fiber composites at high crack propagation speeds. A strip of FM-1000 adhesive was placed at the tip of a pre-existing crack of specimen during laminate lay-up. The presence of the adhesive strip increased the crack initiation toughness substantially so that after initiation an unstable crack propagation was generated and high crack propagation speed could be achieved. Specimens were loaded at quasi-static deflection rate on an MTS machine. Crack extension was monitored by means of a conductive paint circuit applied along the path of the propagating crack. Continuous records were obtained of the load, deflection, and crack extension. The strain energy release rate was calculated by the finite element method using plate elements. Through the simulation of dynamic crack propagation in DCB specimen, it was also found that the energy release rate distribution along an assumed straight crack front is not uniform and the shape of distribution varies with the crack propagation speed.
- OSTI ID:
- 237743
- Report Number(s):
- CONF-9510177--; ISBN 1-56676-376-2
- Country of Publication:
- United States
- Language:
- English
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