efforts, tensions, destruction limit, accumulation point, static definability, limiting state.

Questions of limiting state theory are discussed on the examples of rod system and general flat problem of ideal plasticity theory. Hyperbolic type of equations mainly inherent in statically determinate equations of limiting state theory is connected with reachingt of accumulation point characterized by disappearance of static indefinability zone. Limiting state theory equations concerning elliptical type correspond to accumulation point failure goes leaves to infinity.