期刊
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
卷 20, 期 15, 页码 1705-1726出版社
TAYLOR & FRANCIS LTD
DOI: 10.1163/156856106779024436
关键词
epoxy; aluminium; composites; dynamic mechanical analysis; finite element stress analysis; thermal analysis; glass transition temperature; stress-free temperature
Adhesive joints used in supersonic aircraft fuselage need to withstand low (-55 degrees C), as well as high (200 degrees C) temperatures. However, there are no adhesives suitable for the whole temperature range. A solution would be a joint with a combination of a low-temperature adhesive and a high-temperature adhesive, called a mixed-adhesive joint. In a bonded joint, the thermal stresses are generated essentially by the different thermal expansion properties of the adhesive and the adherends and, to a lesser extent, by the shrinkage of the adhesive produced by curing. The case of a mixed-adhesive joint is more complicated because there are two adhesives with different glass transition temperatures (T-g). To determine the stress-free temperature in a mixed adhesive joint, sandwich specimens of aluminium-adhesive-CFRP (carbon-fibre-reinforced plastic) were fabricated and the thermal strains were measured with strain gauges. In a mixed adhesive joint, two stress-free temperatures were found: the stress-free temperature of the high temperature adhesive, which is its cure temperature, and the stress-free temperature of the low temperature adhesive, which is its T-g..
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