Evaluation of the influence of yield conditions J2–J3 on the stress state of tubular specimens to confirm the static strength of gas turbine shafts

The adopted yield condition can influence the results of calculating the stress-strain state of a part in the case of sensitivity of the part material to the type of stress state. Of interest is the development of a methodology for selecting the yield condition, as well as an assessment of the degree of its influence on the calculation results. The convexity and symmetry requirements imposed on the yield conditions of metal polycrystalline alloys, together with the hypothesis of an elastic change in volume, make it possible to consider a limited set of yield conditions enclosed between the Tresca and Ishlinsky-Hill hexagonal prisms in the space of principal stresses — yield conditions J2–J3. The paper analyzes known versions of such conditions, using the example of B95 alloy, the operation of the algorithm for selecting the condition and estimating its parameters based on the results of testing tubular specimens for tension and torsion is demonstrated. Simulation of tests of tubular specimens under successive tension and torsion using various yield conditions is carried out. Analysis of the calculation results showed that the choice of the yield condition has a significant effect on the equivalent stresses and parameters of the type of stress state during torsion after preliminary stretching.
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