Strength analysis method of automotive cantilever structural part

Abstract

The invention discloses a strength analysis method of an automotive cantilever structural part. The strength analysis method comprises the following steps: a finite element model is obtained by performing modal analysis on the cantilever structural part and a part borne by the cantilever structural part; the finite element model and actually measured modal are subjected to benchmarking; an actually measured acceleration spectrum is loaded to the finite element model after benchmarking for frequency response analysis, and results of stress distribution at different frequencies are obtained. According to the method, the finite element model subjected to benchmarking with the actually measured modal is taken as the base model, the actually measured acceleration spectrum is loaded for frequency response analysis, the results of stress at different frequencies are output, the vibration factor can be mainly considered, the stress distribution state of the cantilever structural part better meeting a field test state is obtained finally, and the analysis precision is higher.

Description

technical field [0001] The invention relates to the technical field of auto parts testing, in particular to a method for analyzing the strength of an auto cantilever structure. Background technique [0002] Cantilever structural parts are widely used in automobiles, mainly in brackets, and the deformation or cracking of brackets is relatively common in the actual use of vehicles. Failure of the cantilever structure will further lead to damage or even fall of the components it carries. Therefore, an important task in the development process of the cantilever structure is to ensure its strength performance. [0003] The essence of the strength analysis of the cantilever structure is to examine whether the stress state under the design condition meets the design requirements. The current strength analysis method for cantilever structural parts is to apply static loads under various design conditions (the design conditions are usually gravity field conditions) at the center of...

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Problems solved by technology

[0004] First, the load is unreasonable, and the rationality of the working condition setting is difficult to grasp. If the load is too strict, it will increase the cost, and if it is too loose, it will bring risks;

[0005] Second, vibration factors are not considered. Since one end of the cantilever structure is fixed and the other end is loaded, its natural frequency is relatively low, and it is easy to resonate with engine excitation and road excitation, which will aggravate the failure

However, the existing method does not consider the vibration factor, and only roughly guarantees its strength performance by increasing the safety factor of the static strength. Therefore, the analysis error of the existing method is relatively large, and the rationality is not enough.

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