Aluminium Design and Construction John Dwight

Table 11.7 and Figure 11.17 provide data on six selected two-component
adhesives (Araldite 2010 to 2015). The quoted cure times to achieve a
shear strength � of 1 N/mm 2 indicate how soon an assembled component
can be handled. Table 11.8 and Figure 11.18 give equivalent data for a
useful one-component adhesive, namely Araldite AV119. All the quoted
strengths, which are typical (not minima), are based on short-term tests
using the standard lap specimen.
The information was provided by Ciba, the strength figures being
unaffected by the alloy of the connected parts. It should be assumed
that the given values refer to specimens having an ideal glue-line thickness,
i.e. less than 0.3 and 0.6 mm respectively for the non-toughened and
the toughened adhesives (Section 11.4.9).
Manufacturers are usually able to provide values of percentage
elongation to fracture, as obtained from a bulk tension type of specimen
(Section 11.4.8). For all but one of the listed adhesives, the elongation is
low (1–4%). The exception is Araldite 2011, which is reported as reaching
a strain of nearly 5% at maximum tensile stress, with 20% elongation at
fracture (at a reduced stress). With 2011, therefore, there will be redistribution
of the stress in a bonded shear-joint before final collapse occurs.
Figure 11.17 Curing times (t) for six selected two-component Araldite adhesives, to
achieve shear strengths of 1 and 10 N/mm 2 . T c =curing temperature.
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