Coppens_Thesis - EFFECTS OF THREE-DIMENSIONAL GEOMETRY ON...

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EFFECTS OF THREE-DIMENSIONAL GEOMETRY ON PENETRATION AND PERFORATION RESISTANCE By George Joseph Coppens A THESIS Submitted to Michigan State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Department of Mechanical Engineering 2004
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ABSTRACT EFFECTS OF THREE-DIMENSIONAL GEOMETRY ON PENETRATION AND PERFORATION RESISTANCE By George Joseph Coppens This thesis determined the penetration and perforation thresholds of laminated, stitched, and two- and three-dimensionally woven composite plates subjected to transverse impact. All composite plates were made from glass/epoxy prepreg tape so direct comparisons could be made about the effects of through thickness reinforcement on penetration and perforation thresholds. The effects of fiber angle were also studied. The laminated plates were made with various stacking sequences and had no additional through thickness reinforcement. The stitched plates were reinforced through the thickness with one-millimeter wide strips of prepreg. The two- and three-dimensional plates were hand woven using 12.7 mm wide strips of prepreg. The three-dimensional weaving technique was innovative in that it incorporated new fabric geometry to reinforce the plates through the thickness. A drop weight tester with an instrumented tup was used to impact the plates. The impact test data was used to determine the penetration and perforation thresholds. The three-dimensional woven plates had larger penetration and perforation thresholds than the laminated and two-dimensional plates as well as reduced delamination areas. The stitched plates had the largest penetration and perforation thresholds. Through thickness reinforcement increased penetration and perforation thresholds. The fiber angles of the laminated and three-dimensional plates also influenced their penetration and perforation thresholds.
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DEDICATION This work is dedicated to all my family and friends who have supported me during the years I have been in college.
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ACKNOWLEDGMENTS The assistance of Dr. Dahsin Liu was gratefully appreciated during my time at MSU. I would also like to thank my committee: Dr. Kwon, Dr. Lee, and Dr. Loos. iv
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TABLE OF CONTENTS Effects of Three-Dimensional Geometry on Penetration and Perforation Resistance . ...1 2004. ................................................................................................................................. 1 ABSTRACT. .................................................................................................................... 2 EFFECTS OF THREE-DIMENSIONAL GEOMETRY ON PENETRATION AND PERFORATION RESISTANCE. .................................................................................... 2 DEDICATION. ............................................................................................................... iii ACKNOWLEDGMENTS. ............................................................................................. iv TABLE OF CONTENTS. ................................................................................................ v LIST OF TABLES. ...................................................................................................... viii LIST OF TABLES. ......................................................................................................... viii LIST OF FIGURES. ....................................................................................................... ix LIST OF FIGURES. .......................................................................................................... ix 1. Introduction ................................................................................................................................................... 1 1.1 Literature Survey. ...................................................................................................... 2 1.1 Literature Survey. ...................................................................................................... 2 1.2 Scope of Current Study. ............................................................................................. 4 1.2 Scope of Current Study. ............................................................................................. 4 1.3 Organization. .............................................................................................................. 5 1.3 Organization. .............................................................................................................. 5 2. Fabrication .................................................................................................................................................... 6 2.1 Material. ..................................................................................................................... 6 2.1 Material. ..................................................................................................................... 6 2.2 Manufacturing. ........................................................................................................... 6 2.2 Manufacturing. ........................................................................................................... 6 2.2.1 Laminated Plates. ................................................................................................ 6 2.2.2 Stitched Plate. ..................................................................................................... 8 2.2.3 Two-Dimensional Woven Plate. ......................................................................... 8 2.2.4 Three-Dimensional Woven Plates. ................................................................... 11 2.3 Curing. ..................................................................................................................... 15 2.3 Curing. ..................................................................................................................... 15 2.4 Specifications. .......................................................................................................... 18 2.4 Specifications. .......................................................................................................... 18 3. Testing ........................................................................................................................................................ 19 3.1 Testing Facility. ....................................................................................................... 19 3.1 Testing Facility. ....................................................................................................... 19 3.2 Operating Procedures. .............................................................................................. 21 3.2 Operating Procedures. .............................................................................................. 21 3.3 Load-Deflection Curves.
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This note was uploaded on 07/25/2008 for the course ME 222 taught by Professor Kwon during the Summer '08 term at Michigan State University.

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Coppens_Thesis - EFFECTS OF THREE-DIMENSIONAL GEOMETRY ON...

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