Abstract
A mechanical and optical characterization study in a uniaxial field was conducted on a commercial di-phase photoelastic material suitable for stress freezing. Results were used in a plane-strain theory for predicting nonlinear crack-tip behavior with the Prandtl-Reuss equations and a Mises criterion. These predictions were compared with frozen-stress photoelastic results obtained from experiments on a variety of technologically important three-dimensional cracked-body problems. Results indicate substantially greater stiffness or constraint in the nonlinear zone near the crack tip than predicted using uniaxial data. However, the value of the maximum shear stress at the onset of nonlinear behavior was accurately established and was the same for all cases examined.
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