stress-strain

In doing a simple tensile test on a metal-polymer sandwich material, the
stress-strain curve appears to have 2 elastic regions.
i.e. the curve goes like this:
i) a very steep straight line (elastic region)
ii) a sharp change to a very gentle slope
iii) a second steep elastic region
iv) gentle yield and slope to failure
It basically looks like one small stress-strain curve then another big one, then
failure.
Has anyone noticed the following phenomena, or has any ideas about the reasons
for it.
Cheers
anjali
Reply to
Anjali Pandit
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