Laminates composed of alternating layers of metal and fiber reinforced polymers (FRP's) exhibit a number of properties, which are preferable to either metals or FRP's alone, making them attractive materials for a number of industries, particularly aerospace. A number of questions persist, however, before these new composites can be widely accepted and utilized; one of which is their response to impact, which may occur over a wide range of velocities. Numerical methods, especially the FEA method, have been widely used to simulate the impact response because they can reduce the cost and save time comparing with the experiment. In this work, a continuum damage based model (CDM) is developed and implemented into FEA commercial software ABAQUS. Using a rate-dependent plasticity model for the constitutive behavior of Aluminum and the CDM for the behavior of fiberglass laminates, the dynamic penetration is simulated using ABAQUS. Force vs. displacement results compare well with those obtained from the experiments. In addition, the computed damage region is in close agreement with that seen in sectioned specimens of the tested material. Simulations are also performed for ballistic experiments conducted on 150mm x 150mm clamped panels of the same laminates. Ballistic experiments involve both the local penetration response as well as the global deformation behavior, particularly at velocities near the ballistic limit, where significant flexural deformation takes place. Results from the simulation agree well with the ballistic experiment results. Given the validity of the modeling approach, the high velocity impact response of the other metal/fiber systems can be examined minimizing the need for trial and error fabrication.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.80121 |
| Date | January 2003 |
| Creators | Li, Wei, 1970 May 26- |
| Contributors | Nemes, James A. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mechanical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 002095397, proquestno: AAIMQ98544, Theses scanned by UMI/ProQuest. |
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