Dear Wenlong
Thanks for replying.
1. Yes, there is large deformation.
2. Yes, large deflection is turned on.

I have found equivalent stress and strains for some set of elements. I got again the linear stress-strain curve as it did for the all the elements.

I have not scoped only for one element. I will try this once.

Also, my doubt is from where should that element is considered. Is it from the necking region?

Thanks in advance
Best Regards