This paper is concerned with anisotropic material in the two-dimensional case. A general yield function is postulated, and it is shown that both the equilibrium equations and the velocity equations are hyperbolic. Moreover, in the perfectly plastic-rigid media the velocity characteristics coincide with the stress characteristics. Thus, for practical applications, once the parameters of the yield function have been found for the anisotropic material, the conventional method of the isotropic case may be adopted, using the relevant relationships along the characteristics. An illustrative example is given.

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