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مکانیک::
مقدار اصلی
principal value
A2 and A3 of U are also the principal values of V, and if Au A2 and A3 define the principal directions of U, then R * Ax , R • A2 and R • A3 define the princi- pal directions of V.
and y coincide with those of 17, and their principal values are A2
F it is much easier to calculate C or JB than U or V, and so the easiest way to calculate the principal stretches and principal direc- tions is by calculating the principal values and principal directions of C or B.
2 \\ and 3 principal values of C
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