Results

In general the specimens failed 100 % cohesively unless otherwise stated below. For a few specimens, imperfections due to air entrapment (bubbles) during mixing and application as well as insufficient mixing (streaking) were observed.

Tension Tests—Table 2 and Fig. 9 provide a summary of the tension test results obtained with specimen Type H0. Figure 10 shows, as a representative sample, the individual stress-strain curves measured for Sealant A at the differ­ent movement rates.

Test results for specimen Type HW were obtained after accelerated ETAG 002 weathering for all sealants at a movement rate of 5 m/ s. Table 3 and Fig. 11 show a comparison of these test results with those obtained for the (unweath­ered) H0 specimens.

The fracture behavior of Sealant A specimens was completely cohesive in the sealed joint. For some specimens of Sealants B and C partially adhesive failure was observed between the sealant and the substrate (aluminum or glass).

For Sealant B, the effect of sealed joint cross section on the tension test results was investigated for all movement rates. Table 4 and Fig. 12 summarize the results obtained for specimen Types HL and HS in comparison to Type H0. Due to the smaller sealed joint volume the results for the specimen Type HS were considerably more affected by vibrations induced by the striker than those obtained for specimen Types HL and H0. The superimposed vibrations did not

image212

image213

FIG. 9—Tension test results obtained with specimen Type H0.

allow a meaningful analysis of stress maxima for movement rates >1 m/s, although the stress-strain curves showed a clear trend towards increased tensile strength for higher movement rates.

Shear Test—Table 5 summarizes the results of the shear tests carried out on Sealant B using specimen Type M.

Combined Tension and Shear Test—Table 6 summarizes the results of the combined tension and shear test carried out on Sealant B using specimen Type

L.

Compression Test—Table 7 summarizes the results of the compression test carried out on all sealants using specimen Type H0.