METHOD OF DIAGNOSIS OF METAL STRUCTURES, PRESSURE VESSEL AND GEAR AND DETERMINATION OF REMAINING OPERATIONAL LIFE Russian patent published in 1995 - IPC

FIELD: diagnosis of state of metals. SUBSTANCE: method includes determination of strength of structure which takes into account both corrosion processes leading to decrease of thickness of members of structures and change of mechanical properties of materials caused by appearance and spreading of cracks. Corrosion rate v_к of metal structure is determined in N points. M samples of metal are taken mechanically in areas of maximum risk of injury of metal structure. Value and rate v_Δ of shift of temperature dependence of characteristics of crack resistance are found for each sample. Change in time of maximum value of stress v_к in areas of maximum risk of injury of metal structure is evaluated by value S_max(t). Change of critical value of stress v_Δ causing destruction of metal structure is determined by value S_кр(t). Remaining operational life of metal structure is estimated by formula Δt = t₁-t₀, where t₀ is moment of examination of metal structure, t₁ is moment of time when S_max(t) = S_кр(t). EFFECT: expanded application field, enhanced authenticity. 1 dwg