By Robert D. Adams (auth.), K. W. Allen (eds.)
Once back, prior to Easter, a goodly variety of humans amassed to listen to a sequence of papers on various features of adhesion provided by means of authors from a couple of nations. total all of them appeared to be in addition happy as ever with what they acquired. One may need idea that by means of now-the twenty-eighth year-the complete variety of attainable subject matters were scanned; yet no, there are papers that are keen on a wholly new one. This arises from the rather fresh reputation that if society is to utilise adhesives and achieve something like their power virtue, then there's a complete sector of dissemination of knowledge and a different kind of schooling which has to be comprehensive. to fulfill this want a number of projects were undertaken, and of those are mentioned inside of this volume-in addition to papers of the extra traditional technological kind. As consistently, i need to list my due to all those that make attainable either those meetings and the books in which the papers can be found to a much broader viewers. The viewers, the authors and their secretaries, a variety of humans in the collage, the publishers and their employees; all are crucial components of the complete. To them, every one and everybody, may perhaps I convey my honest appreciation and gratitude.
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Extra resources for Adhesion 15
The blister shapes produced by two modes of deformation are characteristically different and predictable. The expected interrelationships between Hc and ac are different. 58~=~ c h2 64D Figure 4 shows Hc against ac for the two extreme models based on bending and stretching and also selected experimental data for the present study. 46 TABLE 1 Various Relations Available for Computing Fracture Energy From Blister Test Data Author Equation Type of Storage Energy Model Used Dannenberg Total work Williams (a) InfInite Media Total work (b) Thin Specimen Bending energy Andrews et al Bending energy 2 Pea r=E 2.
J O+-~T-~~~~r-r-r_r-r-r_~~ -8 -6 -4 -2 o 2 Log Velocity ms-1 Figure 5: Plot of log fracture energy against log velocity for Maugis & Barquin data, peel data, pre-blown and pre-fIxed blister data_ Of more signifIcance however is the good agreement observed between the derived values of r based on the stretching analysis (equation 5) for the blister data and the sample peel data obtained for the rupture of smooth polyurethane-steel interfaces (Figure 5)_ Both sets of data are also in close agreement with the results represented by Maugis & Barquin .
S -20 E ! -10 iii .. 2 II. 1 0 10 20 Time (sec) 30 40 20 (sec) 30 40 60 50 E ! ::s 'ii II II: 40 30 20 10 0 0 10 Time FIGURE 3 The transducer reponse for blister height, H, pressure, P, and radius, a as a function of time. At a critical condition, the pressure reaches a maximum and the crack begins to accelerate; at this point, the pneumatic pressure is defmed as the critical pressure, Pc (Figure 3). Eventually the peeling condition becomes catastrophic and a rapid increase in velocity is observed.
Adhesion 15 by Robert D. Adams (auth.), K. W. Allen (eds.)