An Equivalent Conversion Method of Fatigue Load for Large Welded Structural Parts

Abstract

The invention relates to a fatigue load equivalent transformation method of a large-scale welded structural part, which determines the equivalent load information required according to the operating conditions of the large-scale welded structural part and related standards; calculates the stress concentration position and stress of the large-scale welded structural part under the action of a theoretical load State; Combine multiple loads that need equivalent conversion into one load, and initially determine the size and direction of the equivalent load; Determine the magnitude of the load that needs to be converted to the center point of the structural member, calculate and determine the position of the equivalent load; Calculate The stress state of the original stress concentration location of the structural part; compare the fatigue life of the same stress concentration location determined by calculation in the fatigue life diagram; if the error results of the fatigue life of the stress concentration location before and after the equivalent load conversion meet the engineering requirements, then determine the structural part Equivalent loads for fatigue tests. The invention reduces the number of loads, simplifies the test scheme, saves the test cost and shortens the test period under the premise of ensuring the fatigue life of the structural parts remains unchanged.

Description

technical field [0001] The invention relates to a fatigue load test technology for structural parts, in particular to an equivalent conversion method for fatigue load of large welded structural parts. Background technique [0002] With the continuous development of mechanical equipment, its size is getting bigger and bigger, its structure is more and more complex, and its functions are more and more complete. For such large-sized (dimensions greater than 2m in any one direction) and complex-structured equipment, it cannot be prepared by traditional mechanical processing methods, and welding has become the first choice for forming such mechanical structures due to its flexible operation. Therefore, large and complex structures Most of the parts are welded structures, such as car frames and train bodies in daily use. And due to the high functional requirements of large and complex structural parts, they often bear the effects of multiple different loads at the same time. Taki...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantages of high test cost and long test cycle in the fatigue test of large welded structural parts that bear multiple loads simultaneously in the prior art, the problem to be solved by the present invention is to provide a test scheme that can simplify the test, save test cost, shorten Equivalent Transformation Method of Fatigue Load of Large Welded Structural Parts in Test Period

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