ASTM D905: Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression LoadingThis test method covers the determination of the comparative shear strengths of adhesive bonds used for bonding wood and other similar materials, when tested on a standard specimen under specified conditions of preparation, conditioning, and loading in compression. This test method is intended primarily as an evaluation of adhesives for wood.
The values stated in SI units are to be regarded as the standard. The values given in brackets are provided for information purposes only.
The rate of loading affects the strength of an adhesive bond according to the adhesive’s rheological properties. The more viscoelastic or plastic the adhesive, the greater effect. Thermosetting adhesives like urea- and phenol-formaldehyde are elastic.
Their bond strengths can be measured over a range of loading rate from 0.038 to 1.27 cm/min [0.015 to 0.5 in./min] with no apparent affect.
Thermoplastic adhesives like polyvinyl acetate, hot melts, and elastomer-based adhesives exhibit a broad range of elastic, viscoelastic, and plastic behaviors. Their bond strengths will be affected to varying degrees by changing the loading rate.
Generally, increasing the rate, increases the measured strength.
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