Structural fatigue strength design method based on intensity field

Abstract

The invention provides a structural fatigue strength design method based on an intensity field in order to solve the problem of mismatch between a stress field and overall strength in an existing structural fatigue strength design process performed according to an overall strength viewpoint. Fatigue strength of a mechanical structure and fatigue strength of parts serve as field processing, a structural stress field and a fatigue strength field are organically matched, and the specific method comprises the steps of determining ideal fatigue strength field distribution of a dangerous section ofthe structure according to highest stress amplitude distribution of the dangerous section of the structure; designing an actual fatigue strength field of a dangerous section of the structure by combining materials, heat treatment and a cold strengthening-residual stress field; and quantitatively evaluating the fatigue strength design level of the dangerous section of the structure by applying a full-field stress-strength interference model.

Description

technical field [0001] The invention relates to the field of structural fatigue strength design in mechanical design, and is applicable to the fatigue strength design of mechanical structures and components such as ferrous metals and nonferrous metals. Background technique [0002] The fatigue strength design of the existing mechanical structure and parts, whether it is a finite life design or an infinite life design, treats the strength of the mechanical structure and parts as a whole in terms of fatigue strength processing. Therefore, the existing method It is considered that the fatigue strength of the mechanical structure and parts is uniform inside and outside, and there is no difference. This is contradictory to the fact that mechanical structures and parts can be changed by surface heat treatment and work hardening to improve surface strength and hardness itself. The stress of the structure is the concept of the field and the local. The fatigue load amplitude distrib...

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Problems solved by technology

Therefore, the existing design methods based on the overall strength of mechanical structures and components cannot avoid the local excess strength of dangerous sections, and cannot further provide quantitative matching of materials, heat treatments, and residual compressive stresses that affect the fatigue strength of dangerous sections. Lack of design- Theoretical and Technical Basis of Manufacturing Quantitative Matching

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