$1\mathrm{.}22$ Figure P$1\mathrm{.}22$ shows $($i$)$ elastic$-$perfectly plastic and $($ii$)$ elastoplastic with strain hardening idealized responses. What stress is needed in each case to have:

Figure P$1\mathrm{.}22$

Figure P$1\mathrm{.}22$ Full Alternative Text

a$.$ a strain of $0\mathrm{.}001?$

b$.$ a strain of $0\mathrm{.}004?$