Method for equivalently converting fatigue load of large welding structural part

Abstract

The invention relates to a method for equivalently converting a fatigue load of a large welding structural part. Needed equivalent load information is determined according to the operating work condition of the large welding structural part and relevant standards; a stress concentration position and its stress state of the large welding structural part under the effect of a theoretical load are calculated; multiple loads needing to be equivalently converted are combined to form one load, the magnitude and direction of an equivalent load are preliminarily determined; the magnitude of the load needing conversion with respect to a resultant moment of a central point of the structural part is determined, and the acting position of the equivalent load is calculated; the stress state of an original stress concentration position of the structural part is calculated; the fatigue life of the determined same stress concentration positions in an equivalent fatigue life diagram is compared; if fatigue life error results of the stress concentration positions before and after equivalent conversion of the load meet the engineering requirements, the equivalent load of a structural part fatigue test is determined. It is ensured that on the premise that the fatigue life of the structural part is invariable, load number is decreased, a testing scheme is simplified, the testing cost is saved, anda testing period is shortened.

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 sol

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