A steel sheet was deformed plastically. After unloading, it was found that
the principal engineering strains in the plane of the sheet were e1=0.172
and e2=-0.0431. Assume that the ratio of the stresses,α=σ2/σ1,was held
constant during the loading and that there was no stress normal to the sheet
surface. Also assume the von Mises criterion.
(a)Find the ratio,α=σ2/σ1, that prevailed during loading.
─
(b)Find the ratio,σ/σ1, that prevailed during loading.
(c)Find the effective strain.
(d)Assume that the tensile stress-strain curve for this steel can be
approximated by σ=Kε^n with K=650MPa and n=0.22. Find the value of
σ1 just before unloading.
請問要如何講解說明這題，知道怎麼算，但不會講解 =_=
麻煩版友們，拜託了! 萬分感謝!!
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