1. Sam Krueger

2.  Entertainment Center  Preliminary design  Initial  36 plies, glass epoxy  [0 11 /±45 1 /90 5 ] s  No core  Modified design  36 plies, glass epoxy  With foam core  Final design  24 plies, glass epoxy  [0 12 /±45 0 /90 12 ] s  Foam core  Dimensions  Width = 20”  Length = 30”  Thickness = 0.345”  Height = 24”  Withstand 150 lbs in weight

3.  Preliminary Analysis  Final Analysis of Design  Estimations  Factor of Safety ≈ 3  Compressive Strength ≈ 200 MPa

4.  Layup  Top to bottom  12 plies bottom  12 plies top  Leg attachment  Attach top shelf with screws  Lower shelf  1” diameter holes in each corner  Plate to keep lower shelf in place  Problems  Excess material  Edges, corners  Rounding off edges  Trimming where necessary  Time  Time consuming during lay up  Rushing  Loss of quality  Dry Spots  Sloppy edges  Bubbles on bottom layer

5.  Numerical  Assumed max uniform load = 150 lbs/ft  Composite Core Code  Bending Shear Modulus  Shear Modulus  Achievements  Completed composite piece  Top shelf  Withstands desired load  Inaccurate testing  Sitting on top of it  Incomplete  Legs not attached  Second shelf  Paint  Actual testing  Time constraints

6.  Questions, concerns, comments?