Engineering and Structural Adhesives by D.J. Dunn

By D.J. Dunn

This assessment discusses the categories of engineering and structural adhesives in use, houses, merits and drawbacks, and purposes. the writer is a professional with a long time of expertise in adhesive learn and improvement. The assessment is observed via round four hundred abstracts from papers and books within the Rapra Polymer Library database, to facilitate extra studying in this topic.

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Pot life issues in the dispenser due to heat or atmospheric contamination. • Anaerobic adhesives should be kept in contact with atmospheric oxygen to maximise pot life and care should be taken to exclude transition metals in the dispensing lines and valves, which can act as accelerators for the adhesives. Stainless steel and polyethylene are usually the best materials for dispensing lines and pots. • Hot melt polyurethane dispensers must be purged with dry air or nitrogen to prevent premature curing and since their viscosities tend to increase rapidly on prolonged storage at high temperatures, this must be checked frequently and appropriate timers or temperature controllers should be installed to prevent overheating during line shutdowns.

London. 269-72, 29cm, 012 ORGANOSILANE TREATMENTS FOR ALUMINIUM ALLOYS Allington R D; Davis S R; Digby R P:Porritt N; Shaw S J QinetiQ; Airbus UK (Institute of Materials) © Copyright 2004 Rapra Technology Limited The results are briefly reported of Boeing wedge tests carried out on joints of silane-treated aluminium alloy and epoxy resin adhesive to determine the effects of several experimental parameters on the durability of the adhesive joints. Variables investigated were solvent type, silane concentration, pH, hydrolysis time prior to application and silane film drying conditions.

Although these tests are useful in adhesive development and quality control, they are destructive and cannot offer failure prediction for inservice components. Ultrasonic inspection is the most commonly used non-destructive test method and can accurately assess debonding in single adhesive bonds, providing the sensor is perpendicular to the defect plane. However, ultrasound does have some limitations in multilayered specimens and when the sensor cannot be aligned easily. Guide wave technology has been described for evaluation of bonds in curved aircraft surfaces (355).

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