lab manual - Material Selection Lab: Designing a Polymer...

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Material Selection Lab: Designing a Polymer Matrix Composite Lab manual Introduction This lab manual will guide you through the procedures for your design project. Some of the key terms for this project are italicized in this manual. To help you become familiar with casting terminology, the common name of an item will be given along with its corresponding name in casting terminology. Then the casting term, rather than the common name, will be used in the remainder of the manual. In this lab, you are charged with designing a polymer matrix composite (PMC) for a structural loading application, namely uniaxial tension . This manual will guide you through the steps to produce your samples in the given geometry; however, you will have to adjust the procedure to suit your chosen system. You will begin by producing a mold made from a room temperature vulcanizing (RTV) silicone rubber. Once the mold is finished, you can use it to make several test specimens. You will be allowed to submit three specimens for testing, and results from the best performing sample will be considered. Standard laboratory safety practices including safety glasses, gloves, long pants, and closed-toed shoes are required for participation in this lab. The chemicals in this lab will stain clothing. Dress accordingly. Procedures Materials: plastic cups mold release (petroleum jelly) adhesive putty (Play-Doh) RTV tin cure silicone rubber (Smooth-On OOMOO™ 30) glass stirring rods ASTM E-8 dog bone pattern spray on mold release (Smooth-On Universal Mold Release) paper towels chosen reinforcement anything needed to suspend chosen reinforcement in desired manner urethane resin (Smooth-On SMOOTH-CAST 300) furnace razor blade hand saw sandpaper Tensile load frame dyes Tensile load frame with ¾-10 grips for ASTM E-8 type specimen
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Mold construction To produce a mold for casting, a master pattern is required. In a casting shop, a master pattern is created by the pattern maker taking shrinkage into consideration. Shrinkage is the volume change associated with solidification. Typically, the master pattern is larger than the desired dimensions because most materials shrink upon solidification. We will consider any shape change to be negligible, so our master pattern
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This note was uploaded on 11/16/2011 for the course EMA 3013C taught by Professor Bourne during the Spring '10 term at University of Florida.

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lab manual - Material Selection Lab: Designing a Polymer...

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