By Robert D. Adams (auth.), K. W. Allen (eds.)

Once back, earlier than Easter, a goodly variety of humans accumulated to listen to a sequence of papers on a number of features of adhesion offered by way of authors from a couple of nations. total all of them appeared to be in addition happy as ever with what they obtained. One may have notion that by means of now-the twenty-eighth year-the entire variety of attainable subject matters have been scanned; yet no, there are papers that are involved in a completely new one. This arises from the really contemporary acceptance that if society is to utilise adhesives and achieve whatever like their capability virtue, then there's a complete region of dissemination of data and a unique kind of schooling which needs to be entire. to satisfy this want a number of projects were undertaken, and of those are suggested inside this volume-in addition to papers of the extra traditional technological sort. As constantly, i need to list my because of all those that make attainable either those meetings and the books by which the papers can be found to a much wider viewers. The viewers, the authors and their secretaries, a number of humans in the collage, the publishers and their employees; all are crucial components of the complete. To them, every one and everybody, could I show my honest appreciation and gratitude.

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Therefore, an analysis based on stretching, which is fully described elsewhere [2], is used to calculate fracture energy of the polyurethane-steel interface studied in the present work. We have used the relationship [2]. (5) 4. 1 Uncoated Smooth Polyurethane-Steel Interfaces Figure 5 shows typical data for r as a function of the estimated peeling velocity. The computed values of r are a strong function of the corresponding crack velocity which is in part determined by the imposed flow rate. 48 4,----------------------------, [] • 0 A 3 e M & Bdala Peeldata pre-blown blist pre-fixed blist A 2 ..

The Tapometer being used to test one of the curved specimens RESULTS The results are presented in Figures 11 to 20. The results of the Tapometer tests are presented as graduated shaded plots with the darkest regions indicating test points producing the highest difference readings (ie good areas) and the lightest region the lowest values (ie defective areas). DISCUSSION For the purposes of this discussion the specimens were grouped into five categories: those with disbonds, voids, inclusions, geometric characteristics and, finally, a damaged joint.

O Varying bond1ine thicknesses in the range 0 - 3 mm can be tested without re-ca1ibrating. o The technique has been shown to work on substrates with simple curvature . o Varying cross-sections in joints can be detected reasonably well. More generally, it is has been seen that assessment of bond quality cannot be made f rom an individual tes t resu1 t. Ins tead, a series of tes ts mus t be carried out over the whole joint area to identify defective regions. This can obviously make interpretation of the results difficult.

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