Download Advances in Adhesives, Adhesion Science, and Testing by Dennis Damico (Editor) PDF

By Dennis Damico (Editor)

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Initially; the specimen was scanned across the non-bonded portion of the adherend (Fig. 5). About 1000 sensor readings were acquired for each profile (or about one reading per 25 ~tm). The specimen was then advanced 1 mm lengthwise and again scanned across its width. This process was repeated up to 25 times to define a precise beam grid (Fig. 5) for scanning all specimens. To determine adhesive failure, it was necessary to apply appropriate algorithms to the data. For quantitative analysis data were imported to a spreadsheet, smoothed to remove noise from the LVDTs, and then sorted to remove edge effects.

9). Once flattened, the data could then be sorted by distance to the bondline to produce a frequency distribution (Fig. 10). A negative displacement corresponds to wood fragments removed from the adherend. A positive displacement corresponds to wood fragments on the surface that were removed from the opposite adherend. This flattening technique worked well for all specimens except number 5, which had significant cup and bow. 30 ADVANCES IN ADHESIVES, ADHESION SCIENCE, AND TESTING FIG. 6---Two-dimensional digital contour plot of Specimen 2.

The gage length was subsequently used to calculate the strain. TABLE 1--Typical dimensions of FM 300K adhesive specimens. D. 08 40 ADVANCES IN ADHESIVES, ADHESION SCIENCE, AND TESTING Conditioning Relative humidity (RH) is defined as the partial pressure of water divided by the vapor pressure of water at the ambient temperature. Highway bridges in service are exposed to 30 to 100 % RH and --40 to 50~ RH and temperature greatly affect the mechanical properties of polymeric materials. To properly account for these environmental effects, the moisture content in the specimen must be in equilibrium with the RH of the air in the chamber.

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