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

By Dennis Damico (Editor)

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2 % offset method. The method is also applicable to other materials that exhibit a barely discernable transition from elastic to inelastic behavior such as aluminum and high-strength steel. This expectation was verified with specimens made of 2024-T4 aluminum, 6061-T651 aluminum, and ASTM A709 HPS 690W Cu-Ni steel. 50 ADVANCES IN ADHESIVES, ADHESION SCIENCE, AND TESTING * 9 Other applications of the SED method could include determining the onset of instability in columns and beams from records o f load-displacement and moment-curvature such as: buckling, web local buckling, flange local buckling, and lateral-torsional buckling.

The digital micrometer and the traveling microscope were accurate to • ram. These measurements were made at five cross-sections spaced 30 mm apart and centered about the midpoint of the 127-mm gage length between the two grips. The cross-sectional area is the product of thickness and width. The smallest of the five areas was used to calculate the stress for the stress-strain curves. Table 1 lists the mean and coefficient of variation of the thickness, width, and area of three randomly selected specimens.

015,8) "The tensile properties in parentheses are averages for replicate specimens. 860) LENWARI ET AL. ON SED METHOD 47 9 9 7 . TABLE 5 - - S u m m a ~' , o f average tensde properttes o f F M 300K adhesn e. 2 % offset method overestimates the yield strength by the SED method. Given the large variety of stress-strain curves for adhesives subjected to different environments and strain rates, a single offset value cannot be expected to accurately predict the yield strength. Figures 9-11 show the effect of environment on the stress-strain curves at 10"2/s, 10"4/s, and t0"6/s strain rates, respectively.

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