Arm support fatigue analysis method

Abstract

The invention discloses a cantilever crane fatigue analysis method, and the method comprises the following steps: establishing a cantilever crane three-dimensional model, and establishing a cantilever crane network model; carrying out the motion simulation on the boom, and obtaining the discretization data of the position and the load condition at each moment; selecting a plurality of boom motion data, and obtaining a statics stress analysis cloud picture and related data; searching an area with large stress of the boom, and obtaining a stress curve in the area by combining stress analysis results; carrying out an experiment on the three-dimensional model of the boom under a standard working condition, and carrying out comparative analysis on the stress analysis cloud picture and the stress curve; obtaining a fatigue life cloud picture and a fatigue life data result of the cantilever crane through fatigue analysis in combination with the deformation condition of the cantilever crane; judging whether the fatigue strength requirement of the boom is qualified or not, and proposing an optimization scheme. According to the method, a statics analysis technology is adopted, and a large amount of statics analysis is used for replacing kinetic analysis, so that stress analysis and fatigue analysis of the cantilever crane are completed more quickly and effectively.

Description

technical field [0001] The invention relates to a stress analysis method, in particular to a boom fatigue analysis method. Background technique [0002] When the boom is working, it will produce constantly changing stress with the movement of the workpiece load. When the boom is subjected to such repeated load changes, even if the stress value never exceeds the strength limit of the material, the boom may still be damaged. Phenomenon - this is fatigue damage. Fatigue failure is one of the most common reasons for structural failure of the boom. Therefore, when designing the boom or optimizing the service life of the boom, it is necessary to calculate the fatigue life of the product through fatigue analysis to ensure its normal working time. [0003] At present, the commonly used method is to use the maximum external force received by the boom model under standard working conditions as the load, and obtain the stress analysis cloud image of the boom through static finite elem...

AI Technical Summary

Problems solved by technology

[0004] Since the boom keeps moving for a long time during the actual working process, the position and speed of the boom will change at different times, and the stress results under the action of various factors are significantly different from those obtained by only a single load. Therefore, the calculated stress The result deviates from the actual stress peak area and size

If dynamic analysis is performed on the boom, it is difficult to use dynamic analysis with existing software technology, especially for complex parts, it is difficult to obtain accurate stress results, and at the same time, there are constraints and grid models in the calculation. High requirements, and it is difficult to obtain convergent stress analysis results, it takes a lot of time for inspection and calibration, which is not conducive to subsequent fatigue analysis and optimization of boom design

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