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Characterizing delamination migration in carbon/epoxy tape laminates
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Obrien, Thomas K. Ratcliffe, James G. Czabaj, Michael W. |
| Copyright Year | 2012 |
| Description | A new test method is presented for the purpose of investigating migration of a delamination between neighboring ply interfaces in fiber-reinforced, polymer matrix tape laminates. The test is a single cantilever beam configuration consisting of a cross-ply laminate with a polytetrafluoroethylene (PTFE) insert implanted at the mid-plane and spanning part way along the length of the specimen. The insert is located between a 0-degree ply (specimen length direction) and a stack of four 90-degree plies (specimen width direction). The specimen is clamped at both ends onto a rigid baseplate and is loaded on its upper surface via a piano hinge. Tests were conducted with the load-application point located on the intact portion of the specimen in order to initiate delamination growth onset followed by migration of the delamination to a neighboring 90/0 ply interface by kinking through the 90- degree ply stack. Varying this position was found to affect the distance relative to the load-application point at which migration initiated. In each specimen, migration initiated by a gradual transition of the delamination at the 0/90 interface into the 90- degree ply stack. In contrast, transition of the kinked crack into the 90/0 interface was sudden. Fractography of the specimens indicated that delamination prior to migration was generally mixed mode-I/II. Inspection of the kink surface revealed mode-I fracture. In general, use of this test allows for the observation of the growth of a delamination followed by migration of the delamination to another ply interface, and should thus provide a means for validating analyses aimed at simulating migration. |
| File Size | 5288377 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120016321 |
| Archival Resource Key | ark:/13960/t4mm19z7q |
| Language | English |
| Publisher Date | 2012-10-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Scanning Electron Microscopy Polytetrafluoroethylene Epoxy Matrix Composites Kinking Mechanical Properties Plastic Tapes Laminates Cantilever Beams Load Tests Finite Element Method Simulation Delaminating Ply Orientation Fractography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
