Loading durability

TABLE 15.19 Effect of Adhesives on the Sustained Load Durability of FPL-Etched Aluminum Specimens46... 

In all cases, more than one specimen was tested for sustained load durability and the legend for the bar-graphs is as follows. The ordinate shows the sustained load applied to the samples while the abscissa shows the days of exposure. A white bar with an arrow at the end indicates no failure of the specimens, while a white crosshatched bar indicates that at least one sample is still in test. A white bar with a blunt end indicates that all of the samples had failed. In this case, the average of the days to failure of all the tested specimens is given. When possible, the degree of cohesive failure is shown at the end of the failed specimen bar-graph. For example, 0.1 C means 10% cohesive failure and 90% apparent adhesion failure. 

Sustained Load Durability Results for 177 c Cured Film Adhesives on Clad 2024T-3 Aluminum. (The metal was FPL etched, unless otherwise noted.)... 

Sustained Load Durability Results for 120 Cured Paste Adhesives on FPL Etched 5052T-4 Bare Aluminum... 

A three phase project was developed. Phase 1 consisted of a proof of concept with focus on coilability under load (successfully completed in 2012) Phase 2 was to proceed with operational speed and load durability optimization NDT Development and Phase 3, a pre-commercialization in-situ operational mine trial. 

Wangsness, D.A., Snstained load durability of stractural adhesives. Journal of Applied Polymer Science, Applied Polymer Symposia, 32 296-300,1977. bas on symposium on Durability of Adhesive Bonded Stractures held at Picatinny Arsenal, October 27-29,1976. 

Heat resistance (°C) 800 180 Higher load durability maintained in high-temperature ranges... 

The cyclic immersion test and the stressed high-humidity (sustained load durability) test are particularly aggressive and are both discriminating tests for adhesive durability performance. 

The results of the sustained load durability testing and the outdoor weathering studies both give the same order for the relative durabilities of the different adhesive classes and these are summarized in Table III. However, such a ranking of performance should only be taken as a guide. 

Figure 5. Effect of adhesive on the sustained load durability of FPL-etched aluminum specimens. (Exposure conditions are indicated.) r i All samples failed, partial failure,...

In contrast to the attention given to the bonding of aluminum and wood, very few studies have been reported dealing with the durability of other structurally bonded systems." A limited amount of sustained load durability data is available for steel bonded with epoxies and aluminum bonded with urethanesin recent years, reports have appeared dealing with the environmental resistance of modified acrylics and cyanoacrylates. Brockmann has also reported on the durability of steel joints exposed to hostile environments. " ... 

Authors from 3M [14] described the testing of two epoxy adhesives for aluminium designed for hem flange bonding and panel bonding. These adhesives showed outstanding sustained load durability in cyclic corrosion tests even if stressed to 40% of their initial shear strengths. 

Wangsness DA. Sustained load durability of structural adhesives. J Appl Polym Sci, Appl Polym Symp 1977 32 296—300, based on symposium on Durability of Adhesive Bonded Structures held at Picatinny Arsenal, October 27—29, 1976. 

---