Peel diagram

When loading this test piece with force F it is noticed that, unlike in the tensile shear test, the force is not applied to an area A (= b x fu), but to a line X... X. The other area of the adhesive layer remains unstressed. Thus, in this case strength cannot be defined as force per area , but the force referring to a line is called peel resistance. If the test piece shown in Figure 10.5 is tom apart by means of force F, and the force over the peeled distance is recorded, the following peel diagram results (Figure 10.6). 

Fig. XII-15. Diagram of peel test. A and B, adhesive joint C, double Scotch adhesive tape and D, rigid support. (From Ref. 107. By permission of IBC Business Press, Ltd.)...

Fig. 6. Schematic diagram of the steps involved in the cookie cutter method of cell selection. (A) Cells are grown on plastic Petri dishes covered with a darkened nylon film. (B) Based on fluorescence intensity image scans using a stage-scanning laser microscope, rare event cells are identified, and octagonal welds are made around those cells to fuse the film to the dish. (C) The film is then peeled away from the dish. (D) The cookies containing the desired cells remain on the dish so that the cells may be analyzed further or subsequently cloned.

Figure 1. Schematic diagram of sample strip chart recording of the peel force vs. displacement.

Hie diagram show how limonene can be extracted from lemon peel by steam distillation. 

Schematic diagram of the layers of the skin adapted to peelings.

Fig. 3.5. A schematic diagram of the McMullan PEELS acquisition system currently in operation (courtesy of Dr C. Walsh). Simple switching of the post-quadrupole deflection coil can direct the transmitted electrons to separate detectors to form a bright field image as well as a two-dimensional micro-diffraction image respectively.

Figure 2. Schematic diagram of apparatus for measuring peel strength at various temperatures...

FIGURE 27.2. Diagram of an ASTM D1876 T-peel specimen. 

Figure 2 shows schematic diagrams of some good and poor joint designs related to the preceding comments. It can clearly be seen that the major difference between good and poor is to restrict peel-cleavage stress of the joint. 

Before canning, tomatoes, peaches, and the like are "caustic peeled" in a continuous process that involves treatment with hot, quite concentrated NaOH solution, followed, of course, by a thorough water wash. A typical conveyer system is diagrammed in Figure 3. Temperature control, long practiced in industry, presents no special problems the maintenance of the desired alkalinity is another matter (1J ). An effective approach makes use of the oldest electrochemical measurement, conductance. However, the modern electrodeless sensing system uses totally-enclosed coupled coils and is not fouled by suspended matter in the electrolyte. 

FIGURE 15. Schematic diagram of a 180° soft-machine peel test. 

Figure 6.2 Schematic diagram of some good and poor joint designs. The good designs attempt to distribute the imposed loads within the adhesive layer as a combination of shear and compressive stresses avoiding tensile, cleavage and peel stresses as far as possible.

Figure 6.27 (a) Schematic diagram of a peel test, (b) Distribution of normal stresses in the adhesive layer ahead of the advancing peel front [92]. 

The diagram of an impact peel test in Fig. 46.13 shows the difference of a crash-suitable adhesive in contrast with a very good structural automotive adhesive. 

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