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The previous team from last year failed to obtain correct data for strain in glass under changing temperature; they did not use the appropriate adhesive that would not soften under high temperature. This year, an epoxy called OMEGA Bond 200 was used (figure 1). Its physical properties are also attached below (figure 2). The preparation and curing time of using this epoxy totals to about 10 hours. The epoxy comes as a twin package dividing the resin and the catalysts. First, the package must be heated up to about 150 ºF for about an hour. Second, the "green" divider must be removed to mix 100 parts of the resin (black) and 10 parts of the catalysts (white) until the mix is uniform in color-- the package is already in 10:1 ratio for the resin and the catalysts. After the product is properly mixed, it can be applied to the surface. This adhesive only cures under high temperatures. Curing time takes 8 hours if it is put in the oven under 250F250ºF, and less time if placed under higher temperatures.

Strain Gages/Wheatstone Bridge System

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