Experimental investigation of impact induced delamination in thich composite plates using high speed photography and CGS interferometry
- California Institute of Technology, Pasadena, CA (United States)
In this work we present some preliminary results of optical experiments performed on dynamically deforming thick polymeric composite laminate plates. The composites used for this study are graphite-epoxy fiber reinforced composite plates, consisting of 48 plies (1/4 inch thickness) in a quasi-isotropic arrangement. The plates are impact loaded in an out-of-plane and an in-plane configuration using a gas gun. Impact velocities are of the order of 1 m/s. The lateral shearing interferometer of Coherent Gradient Sensing (CGS), in conjunction with high speed photography, is used to obtain real time interferograms of the out-of-plane deformation of the laminate. Both the elastic behavior of the laminate and the deformation following the onset of dynamic delamination are observed. Quantities such as the speed of delamination are measured and presented. It is planned to obtain a failure condition that will predict the initiation and growth of the delamination process in such composite systems. In addition, the effect of the application of a static pre-load, around the specimens, on the particular conditions for dynamic delamination is investigated.
- OSTI ID:
- 175414
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0389
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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