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equivalent strain

Submitted by far_jod on

Dear reaserchers

Here is my question in developing the eqivalent strain via in-plane stress problems. please let me find your answers.

I did an experimental test on a 6 mm thickness plate. Principal strains (ε1,ε2) was developed from recorded strains via Rosset strain gauges . To develop the equivalent strains I need ε1 , ε2 , ε3  in the following eqation:

dεe=(√2/3)(dε12+dε22+dε32)1/2

As there are not recorded any ε3 ,thus let me know that how i can calculate the eqivalent strains?

regard

Far

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