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Extra resources for Advances in Adhesives, Adhesion Science, and Testing

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The laserscan instrument was sensitive enough to detect these narrow adhesive regions, which may not have been readily apparent in visual observations. Specimen 3 (Fig. 2) was also a problematic surface to evaluate visually even though the regions of adhesive and wood failure were more obvious than those of specimen 2. Despite this, the visual determinations of wood failure still varied widely (30-95 %). The laser-scan instrument indicated 52 % wood failure at the 40 ~tm-tolerance levels and 37 % wood failure at the 60 ktm-tolerance levels.

Each vertical bar in the figure represents an increment of strain energy density (SED). However, to improve the accuracy of fmding the yield point, the authors retained only the SED corresponding to the shaded triangular areas atop each bar as the indicator of elastic and inelastic behaviors: 1 Au = 1 ~~ - ~( 2= TM -~') (~,+i-E,) (]) where Au = SED, A~ = stress increment, and AE = strain increment. It is emphasized that the strain increments must be constant during the entire test. The adhesive behaves elastically for as long as Au is linear and inelastically when Au deviates from a linear trend.

Presented at ASTM Symposium on Advances in Adhesives, Adhesion Science, and Testing on 4-6 October 2004 in Washington, DC. l Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061. 2 Professor Emeritus of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA 2406 I. 3 Professor of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA 24061. PA 19428-2959. 53 54 ADVANCES IN ADHESIVES, ADHESION SCIENCE, AND TESTING to obtain information relevant for crash-worthiness, but quasi-static testing was also conducted to provide a means of comparison with dynamic data.

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