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lode angle value to fulfill the shear state in the deviatoric plane

lode angle value to fulfill the shear state in the deviatoric plane

lode angle value to fulfill the shear state in the deviatoric plane

(OP)
I make some work concerning a clay cylinder. The cylindrical coordinate is respected. Mohr Coulomb plastic criterion is considered, it is projected on deviatoric pie-plane and it is expressed in (I1/3 , J2,theta(lode angle)).
I would appreciate knowing your advice concerning the following question.
Does theta has to be ONLY = -30° or Only = +30 ° or either in the range from 0° to +30° or from 0° to -30° in order to fulfill the constancy condition (shear case)?.
Thank youbeforehand

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