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Description of ASTM-D905 2008ASTM D905 - 08e1Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression LoadingActive Standard ASTM D905 | Developed by Subcommittee: D14.30 Book of Standards Volume: 15.06 ASTM D905Significance and Use It cannot be assumed that this test method measures the true shear strength of the adhesive bond. Many factors interfere or bias the measurement including the strength of the wood, the specimen, the shear tool designs themselves, and the rate of loading. Wood failure is very common in joints made with strong adhesives. Although high wood failure is normally desired, when it occurs the measured strength is lower than the true adhesive bond strength. Stress concentrations at the notches of the specimen tend to lower the measured strength. In a similar test for the shear strength of solid wood, Test Methods D 143 , these effects are self correcting so that the measured strength is close to the true shear strength of the wood. By analogy the same may be true in this test method, however, other factors are also involved and may alter the relationship. 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. This test method is suitable for product research and development, qualifying adhesives in accordance with certain product or performance specifications, and monitoring bonding process control. This test method may be suitable for comparing and selecting adhesives, however, such comparisons must be made with caution since the measured strength of some adhesives may be different in different types of joints. Strength values obtained by this test method are not suitable as design shear strengths values without adjustment by certain engineering design factors. 1. Scope 1.1 This 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. 1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets are provided for information purposes only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM Standards D143 Test Methods for Small Clear Specimens of Timber D907 Terminology of Adhesives D5266 Practice for Estimating the Percentage of Wood Failure in Adhesive Bonded Joints Keywords adhesive; bond; compression; compression loading; shear; strength properties; Bond strength--adhesives (wood-to-wood); Compression testing--adhesives; Shear testing--adhesives; Strength--adhesives; Adhesives (wood); Wood products (adhesives); Adhesive bonds; ICS Code ICS Number Code 83.180 (Adhesives) DOI: 10.1520/D0905-08E01 ASTM International is a member of CrossRef. ASTM D905This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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