METHOD FOR DETERMINING THE STATIC STRENGTH OF A COMPLEX STRESSED PART OUTSIDE THE ZONES OF CONTACT FORCES ACTING ON IT (VARIANTS) Russian patent published in 2023 - IPC G01L1/00 G01N3/32 

FIELD: measuring technology.

SUBSTANCE: invention relates to methods for determining the strength of complex stressed parts loaded with a system of forces, individual components of which can change asynchronously with respect to each other, and the number of cycles of their loading does not exceed the limit of quasi-static fatigue. Essence: in the Oστ coordinate system, a series of limiting Mohr circles are constructed, which cover various tensors of the limiting plane-stressed states of the part material preceding its static strength limit or the beginning of plasticity. The diameters of these circles are drawn in straight lines parallel to the Oτ axis and a line is drawn around the intersection points of these diameters with the circles bounding the specified Mohr circles. This line is the boundary of the region of the limiting plane-stressed states of the part material. In the experimental construction of such a boundary, the limiting Mohr circles are constructed by creating various tensors of the plane-stressed state in samples from the part material, and in its calculated construction according to formulas accepted as strength hypotheses. Tensors of plane-stressed states that occur at various points of the surface layer of the part during loading are depicted in the coordinate system Oστ in the form of Mohr circles and monitored so that the diameters of these circles drawn in the vertical direction do not go beyond the boundary of the region of the limiting plane-stressed states of the part material. Additionally, the specified reserve of static strength n in the studied area of the surface of the part is determined.

EFFECT: increase in the accuracy of determining the static strength of parts on their surface areas located outside the impact zones of contact forces.

2 cl, 6 dwg, 1 tbl