Definite life extension method of key structural elements of in-service mechanical equipment under fatigue load

Abstract

The invention provides a method for determining life extension of key structural elements of in-service mechanical equipment under the action of fatigue load. The method splits complex mechanical equipment into independent structural elements, and analyzes the history of key structural elements by determining the key structural elements of mechanical equipment. Use conditions, determine the main failure parts of key structural elements and their fatigue loading conditions, carry out damage detection and evaluation of structural elements and mechanical performance tests of materials, and use different evaluation models for different damage characteristics to evaluate the remaining life, so as to realize the The definite life extension of key structural components of mechanical equipment achieves the purpose of providing data support for the definite life extension of mechanical equipment; this method realizes definite life extension based on the damage status of key structural components and the fatigue potential of its materials, which can greatly reduce the fatigue test time and cost, and improve This ensures the accuracy of life-defining and prolonging results.

Description

technical field [0001] The invention belongs to the technical field of fatigue, and relates to a life extension method under the fatigue load of key structural elements of in-service mechanical equipment. Background technique [0002] Modern high-tech complex mechanical equipment, especially weaponry, often consists of hundreds or even thousands of parts. Due to the many functional systems and strong correlations of mechanical equipment, the work of determining and prolonging the life of mechanical equipment is a huge engineering system. For higher reasons, it is more difficult to determine and prolong life. At present, some equipment in our country has reached the design life one after another. Since these equipment are generally conservative in the design stage, they still have great life potential, so there is an urgent need for a suitable life extension method. However, the current domestic methods to determine or extend the life of mechanical equipment mainly include ...

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Problems solved by technology

However, the current domestic methods to determine or extend the life of mechanical equipment mainly include in-factory life test method, field information method and engineering analysis method. , but the reliability of this method is often low due to the lack of basic data of a large number of component test studies, and the test cost is also very high with the extension of equipment life

The external field information method is to determine the life of the equipment through the external field information, and the specific failure mechanism of the equipment is not studied deeply, so the accuracy is difficult to guarantee

The engineering analysis method is to use the engineering judgment method to realize the life determination of the equipment. This kind of method mostly depends on the engineering experience, and the accuracy is not easy to guarantee

It can be seen that the life extension of mechanical equipment is a complex system engineering, and there is no very complete method at present

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