Tensile adhesion strength

Crosslinking has been claimed to improve thermal resistance of the cyanoacrylate adhesive [18]. However, in other reports [6], little or no improvement in thermal resistance of the adhesive was demonstrated by the addition of a difunctional monomer. As seen in Fig. 2, the addition of varying amounts of crosslinker 7 provided no improvement in the tensile adhesive strength of ethyl cyanoacrylate on steel lapshears after thermal exposure at 121 °C for up to 48 h. 

Test Method for Adhesion in Peel of Elastomeric Joint Sealants Recommended Practice for Surface Preparation of Concrete for Application of Chemical Resistance Resin Monolithic Surfaces Method of Testing Release Papers Used with Preformed Tape Sealants Test Method for T-Peel Strength of Hot Applied Sealants Test Method for Tensile Adhesive Strength of Preformed Tape Sealants by Disk Method... 

Table 5.4 Tensile adhesion strength (ASTM C633-13) of LPPS (VPS) hydroxyapatite coatings Cl (deposited from as-received powder) and C2 (deposited from powder sintered for 1 h at 1300°C) as a function of immersion time in HBSS (n = 5) (Heimann and Vu, 1997).

The three types of coating were deposited onto Ti6Al4V substrates. The coating thickness varied between 160 and 270 pm. The parameter space used in the statistical design matrix is shown in Table 6.2. Table 6.3 shows the coded relevant parameters (in bold) for optimum values of surface roughness (Kj, porosity (P) and tensile adhesion strength (a). 

The coating properties varied as follows porosity 3-9%, surface roughness 9-22 pm and tensile adhesion strength 30-58 MPa (Table 6.4). 

Figure 6.2 shows cross-sectional SEM images of coating type I with maximum surface roughness (a), type II with maximum porosity (b) and type III with maximum tensile adhesion strength (c). The (crystalline) phase contents of the as-sprayed coatings are shown in Table 6.5. Coating type I has a maximum hydroxyapatite content of 66 3 mass%, followed by type III with 61 3 mass%. The... 

The coating tensile adhesion strength determined by ASTM C633-13 designation (see Chapter 7.5.1.1) can be expressed by the polynomial equation... 

Figure 7.40 Development of all-through cracks in a plasma-sprayed hydroxyapatite coating of about 200 pm thickness, 10 0.5 pm average surface roughness (fta), 5 1% porosity and 50 9 MPa tensile adhesion strength (Heimann et at., 2001).

DIN EN 582-01 (1994) Thermal spraying determination of tensile adhesive strength 2014 Beuth-Verlag GmbH, Berlin, Germany. 

The result shows that the determined values for the tensile adhesion strength are extremely low. The tensile adhesion strengths of all cement stone samples are significantly lower than the tensile strengths of both stones and the cement stones themselves. When judging the fracture pattern it could be observed that above all it had come to a cohesion failure of the stones. The examination of the test pieces before test start showed a pre-damage on all samples which had not been there on the stone slices after demoulding (Fig. 7). 

Cyanoacrylates were shown to form a strong durable bond between bones in vitro. Tensile adhesive strength betw een smooth bovine cortical bone specimens bonded together with the isobutyl monomer and tested after one day storage in water was approximately 6.5 mPa (Brauer et al, 1979). The monomer was used, without evidence of histotoxicity, to repair osteochondral fractures (Harper and Ralston, 1983) and recently to improve meniscal repairs (Koukabis et al, 1995). Butylcyanoacrylate was also used in facial bone surgery for frontal bone reconstitution (Avery and Ord, 1982). 

BS EN 582 1994 Thermal spraying. Determination of tensile adhesive strength. 

Test for tensile adhesive strength of preformed tape sealants by disk method Test for yield strength of preformed tape sealants... 

ASTM C-1135 can be used to determine the tensile adhesion strength of a sealant bond. Although no ASTM standards that specifically address the measurement of the adhesion or bond strength of sealants loaded in shear, the standards in place for adhesive bonds can be used (single lap shear - ASTM D-1002, notched lap shear - ASTM D-3165, and double lap shear - ASTM D-3528). Much of the adhesion testing that is performed in the industry is testing to determine the effects of environmental and chemical exposure on sealant adhesion. This exposure can be either static or cyclic (Gutowski and Cerra 2009). 

Almost the same improvements are obtained by applying the repair mortar through a dry shotcrete process. Within this process the water is mixed with the dry mortar only in the jet. After that the mixed mortar is immediately sprayed onto the surface. Despite this extremely short mixing and almost no slake time, the redispersible powder redisperses quickly and completely enough in order to improve the tensile adhesion strength and the flexural strength in almost the same magnitude compared to a conventional application by hand. 

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