METHOD OF DETERMINING COEFFICIENT OF NORMAL STIFFNESS OF ELASTIC-PLASTIC CONTACT PARTS WITH DOUBLE CURVATURE Russian patent published in 2016 - IPC G01N3/08 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment for determination of contact stiffness. Essence of the invention: surfaces of contacting parts with certain elastic constants of materials are pressed to each other with preset force F, normal to the plane of joint; there is determined residual h and elastic α_y of the part complete approach in contact and their sum is used to determine the value of complete approach α in contact, followed by determination of coefficient j of normal stiffness of elastic-plastic contact of parts with two-fold curvature. Preliminary, there is measured plastic hardness ND₁ and ND₂ of every part in the contact zone, on the basis of which there is determined a normalised plastic hardness ND_pr of contacting parts, then there is determined a total residual part of approach h_Σ at the center of parts contact, with due account for which there is determined a total elastic approach α_e,Σ in the centre of the parts contact, with subsequent determination of total complete approach α_Σ and coefficient j of normal stiffness of elastic-plastic contact of parts with two-fold curvature.

EFFECT: creation of a new universal method to determine the coefficient of normal stiffness of the initially point-like elastic-plastic contact of parts, which is accurate at random combination of contact parts materials hardness.

1 cl, 3 tbl