Shear pull test

FIGURE 6.9 Schematic view of a shear pull test configuration 

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Both static and dynamic tests are employed to evaluate the adhesion strength of cord-mbber composites. The major static tests used in tire industry are H-adhesion, 90/180° peel test, tire cord adhesion test (TCAT) and co-axial shear pull-out test (CSPT). Although these methods are... 

Scotch-tape test [13,16-20] Abrasion test [18,21] Bend and stretch test [15,22] Shearing stress test [22-24] Direct pull-off method [15,25-39] Moment or topple test [40-43] Electromagnetic tensile test [44] Laser spalation test [45] Ultracentrifuge test [13,22,46-50] Ultrasonic test [13,76] Peeling test (13, 51-54] Tangential-shear test [55,56] Scratch test [50,52, 57-73]... 

Tensile strength, Tensile strength is evaluated by pull testing on metal lap-shear coupons, most often aluminum. The standard test method is ASTM D1002, Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal) Alumi-... 

The first ever equation used to describe adhesion between solids was devised by Coulomb in 1773 to explain the movement of soils under load. In a shear box test (Fig. la), a powder is loaded with a normal force N, and sheared with a force F. In general, the plot of F versns N (Fig. 1(b) does not pass throngh the origin but is displaced by an amount A on the horizontal axis. This displacement A represents the adhesive force pulling the particles into contact by Dispersion forces or other molecular attractions. Conlomb s eqnation describing this behavionr may be written as... 

After a dwell time of five seconds under the device, it can be seen in Figure 7.10 that the shear strength of the bond between the LPDE sample and cyanoacrylate adhesive increased 10-fold, and the shear strength of the bond between the LPDE sample and the light cure acrylic adhesive increased 40-fold. Subsequently, MIL-STD-883 Method 2011.7 was applied as a destructive bond pull test to evaluate bond strength and bond strength distribution of various surface contaminations after CO2 treatment. The apparatus used had an accuracy of 5% and performed at a 90° peel angle. 

The adhesion of tiles to the substrate is certainly as important for a ceramic tile adhesive as the flexibihty. The European Norm uses a pull off test to determine the adhesion, where as the US standard ANSI 118.1 - 1999 prefers the shear bond test. A simple ceramic tile mortar with no polymer modification will fail in the adhesion test especially after heat aging or over wood (ANSI 118.11 - 1999). The same mortar modified with only 2 % of redispersible powder will pass both tests. With the puD-off... 

As described in Section 6.4.1.2, it is also possible to use shear testing to determine the adhesive strength of the metallization on MID [175]. An alternative to shear testing is to use a hooked chisel for pull-testing the legs of components and wire bonds. This can often be accomplished using the same system technology. 

FIG. 14 Printed circuit board JR-01 used for thermomechanical fatigue testing utilizing the thermal cycling conditions from -40 to 125°C, with 30-min dwell times at the temperature extremes. Testing also included a shear test for chip components, and a tensile pull test for QFP leads. 

In the push out test [93], the fiber is pushed into the matrix rather than being pulled out. The test allows the measurement of two quantities, Fdcb (the force at which debonding occurs) and F/., (the force needed to push the fiber through the matrix sample if it is thin enough). The bond shear strength Tdeb is calculated using the shear lag theory ... 

The mechanical properties of a material describe how it responds to the application of either a force or a load. When this is compared to an area, it is called stress, another term for pressure. Three types of mechanical stress can affect a material tension (pulling), compression (pushing), and shear (tearing). Figure 15.27 shows the direction of the forces for these stresses. The mechanical tests consider each of these forces individually or in some combination. For example, tensile, compression, and shear tests only measure those individual forces. Flexural, impact, and hardness tests involve two or more forces simultaneously. 

Pull-out tests done with PP monofilaments having a rectangular cross section that ranges from 0.5 x 1.0 to 0.65 x 1.4 mm, indicated that oxyfluorina-tion readily doubles the shear bond strength (see Table 16.14). 

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